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More than 4000 aviation acronym in this article ,we tried to collect all aviation related abbreviations and acronyms, Kindly consider to check validity and feedback us with any comments.

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abbreviations meaning source
...T Bearing (true)
A Amber ICAO
A/A Air to air
A/G Air-to-ground
AAA Amended meterological message ICAO
AAAA Aerial Application Association of Australia
AAC Airworthiness Advisory Circular CAR 1988
AACC Area approach control centre
AAD Assigned altitude deviation
AAIM Aircraft Autonomous Integrity Monitor
AAIS Automatic aerodrome information service
AAL Above aerodrome level
AAR Authorised Airworthiness Representative CASR Part 183
AAT Administrative Appeals Tribunal
ABAA Amateur Built Aircraft Acceptance CASR Part 21
ABAS Aircraft Based Augmentation System
ABF Australian Ballooning Federation
ABI Advance boundary information
ABM Abeam
ABN Aerodrome beacon
ABT About
ABV Above...
AC Advisory Circular CASR 1998
AC Altocumulus (met) ICAO/AIP
ACA Australian Commonwealth Authority
ACARS Aircraft communication addressing and reporting system (pronounced 'AY-CARS')
ACAS Airborne Collision Avoidance System CAR 1988
ACC Area control centre
ACCID Initial notification of an aircraft accident
ACD Airways clearance delivery
ACFT Aircraft
ACJ-XXX Advisory Circular Joint (issued by the JAA, can be followed by a country code) JAA
ACK Acknowledge
ACL Altimeter check location ICAO
ACN Aircraft classification number ICAO
ACN Australian company number
ACPT Accept, accepted
ACROB Acrobatics
Act the Civil Aviation Act 1988
ACT Active, activated, activity
AD Aerodrome ICAO/AIP
AD Airworthiness Directive CASR Part 39
ADA Advisory area ICAO
ADAO Authorised Design Approval Organisation CASR Part 146
ADC Aerodrome chart
ADDGM Aerodrome diagrams
ADDN Addition, additional
ADF Automatic Direction Finding (equipment)
ADF Australian Defence Force
ADIZ Air Defence Identification Zone ICAO/
ADJ Adjacent
ADO Aerodrome office ICAO
ADQ Adequate aerodrome
ADR Advisory route
ADS The address (when this abbreviation is used to request a repetition, the question (IMI) precedes the abbreviation, eg IMI ADS) (to be used in AFS as a procedure signal) ICAO/AIP
ADS Automatic Dependent Surveillance AIP/ICAO
ADS-B Automatic Dependent Surveillance - Broadcast AIP
ADS-C Automatic Dependent Surveillance - Contract AIP
ADSU Automatic Dependent Surveillance Unit ICAO
ADZ Advise
AEB CASA's Airworthiness Engineering Branch CASA
AEP Aerodrome emergency plan
AER Authorised Engineering Representative CASR Part 183
AERIS Automatic en route information service
AFAP Australian Federation of Air Pilots
AFCS Automatic flight control system ICAO
AFIL Flight notification: - filed in the air, or - indicating the position at which ATS services will first be required
AFIS Aerodrome flight information service ICAO/AIP
AFM Aircraft Flight Manual CAR 1988
AFM Yes, affirm, affirmative, that is correct
AFRU Aerodrome Frequency Response Unit (also known as a "beepback" unit)
AFS Aeronautical fixed service ICAO/AIP
AFT After
AFTN Aeronautical fixed telecommunication network ICAO
AFZ Australian fishing zone(s)
Ag Agriculture
AGA Again ICAO
AGD Attorney-General's Department
AGL Above Ground Level ICAO/AIP
AH Artificial Horizon
AH After hours
AIC Aeronautical Information Circular AIP
AIDC Air traffic services inter-facitility data communications ICAO
AIP Aeronautical Information Publication ICAO/AIP
AIP ENR Aeronautical Information Publication En-route
AIP ERSA Aeronautical Information Publication En-route Supplement Australia
AIP GEN Aeronautical Information Publication General
AIRAC Aeronautical Information Regulation and Control ICAO/AIP
AIRC Aeronautical Information and Control ICAO
AIREP Air-Report AIP/ICAO
AIRMET Information in plain language concerning weather significant to light aircraft operations at or below 10,000FT
AIS Aeronautical Information Service AIP
AL Approach Lights
ALA Aircraft Landing Area AIP
ALA Alighting area ICAO
ALA/HLS Aircraft Landing Area/Helicopter Landing Site
ALAEA Australian Licensed Aircraft Engineers Association
ALARP As Low as Reasonably Practical
ALERFA Alert phase
ALI Airworthiness Limitation Item
ALM Aircraft Landing Minima
ALR Alerting Message
ALRS Approach lighting system ICAO
ALS Approach Lighting System
ALT Altitude
ALTN Alternate, Alternating (light alternates in colour)
ALTN Alternate (aerodrome)
AMA Area minimum altitude ICAO
AMC Acceptable Means of Compliance
AMD Amend, Amended
AMDT Amendment (AIP amendment) ICAO/AIP
AME Aircraft Maintenance Engineer CASR Part 66
AMM Aircraft Maintenance Manual WATOG
AMO Approved Maintenance Organisation CASR Part 145
AMP Aircraft Maintenance Program CASR Part 145
AMPA Authorised Maintenance Personnel Assessor CASR Part 66
AMRD Australian Maintenance Requirements Document CASR Part 43
AMS Aircraft Maintenance Specialist CASR Part 145
AMSA Australian Maritime Safety Authority
AMSL Above Mean Sea Level
AMSS Aeronautical mobile satellite service ICAO
AMT Aircraft Maintenance Technician CASR Part 66
ANA Air Navigation Act
ANC Aeronautical Chart 1:50,000 (followed by name/title)
ANCS Aeronautical navigation chart - small scale (followed by name/title and scale) ICAO
ANO Air Navigation Order
ANS Answer ICAO
ANTA Australian National Training Authority CASR Part 66
ANVIS Aviator Night Vision Imaging Systems
AO Air Operator
AOC Air Operators Certificate CASR Part 119
AOC Aerodrome Obstacle Chart (followed by name/title) /AIP
AOCM Air Operators Certification Manual
AOD Alcohol and Other Drug CASA
AOG Aircraft On Ground WATOG
AOPA Aircraft Owners and Pilots Association
AP Airport
APAPI Abbreviated Precision Approach Path Indicator (pronounced 'AY-PAPI')
APCH Approach
APDC Aircraft Parking/Docking Chart (followed by name/title)
APF Australian Parachute Federation
APMA Australian Parts Manufacturer Approval CASR Part 21
APN Apron ICAO/AIP
APP Approach Control
APRX Approximate, Approximately
APSG After Passing
APU Auxillary power unit ICAO
APV Approach with Vertical Guidance
APV Approve, Approved, Approval
AQZ Area QNH Zone
ARC Area Chart ICAO/AIP
ARFFS Aerodrome Rescue and Fire Fighting Service (sometimes referred to as RFFS) CASR Part 139
ARFL Aeroplane Reference Field Length
ARFO Area Forecast
ARH Aircraft Registration Holder CASR Part 47
ARM Airspace Risk Model ICAO/CASA
ARM Aircraft Recovery Manual WATOG
ARN Aviation Reference Number CASA/AIP
ARNG Arrange
ARO Air traffic services reporting office ICAO
ARP Aerodrome reference point ICAO/AIP
ARP Air-Report (message type designator) ICAO/AIP
ARQ Automatic error correction ICAO
ARR Arrive, Arrival
ARS Special Air-Report (message type designator)
ARST Arresting (specify (part of) aircraft arresting equipment) ICAO
AS Altostratus (meteorological) ICAO/AIP
AS Australian Standard
ASA Australian Skydiving Association
ASAC Australian Sports Aviation Confederation
ASAP As Soon as Possible
ASC Ascend to or ascending ICAO
ASDA Accelerate-stop distance available ICAO
ASE Airborne Support Equipment WATOG
ASE Altimetry System Error ICAO/AIP
ASEPTA Approved Single-engine Turbine Aeroplane
ASF Aviation Safety Forum
ASH Aviation Services Handbook
ASI Air Speed Indicator
ASI Aviation Safety Index
ASIR Aviation Safety Incident Report
ASPH Asphalt ICAO
ASR Area Surveillance Radar
ASRA Australian Sport Rotorcraft Association
ASSI Air Safety Support International- a wholly-owned subsidiary of the UK Civil Aviation Authority Air Safety Support International (UK)
ASTM American Society for Testing Materials
ASTRA Australian Strategic Air Traffic Management Group
AT-VASIS Abbreviated 'T' Visual Approach Slope Indicator System (pronounced 'AY-TEE-VASIS')
AT... At (followed by time at which weather change is forecast to occur) ICAO
ATA Actual Time of Arrival
ATA Air Transport Association
ATC Air Traffic Control (in general) ICAO/AIP
ATD Actual Time of Departure
ATE Automatic Test Equipment WATOG
ATEL/ANAV Aeronautical Telecommunication and Radio Navigation Services CASR Part 171
ATFM Air Traffic Flow Management
ATIS Automatic terminal information service ICAO
ATM Air traffic management ICAO/AIP
ATN Aeronautical telecommunications network ICAO
ATO Aviation Testing Officer
ATP At.. (time or place) ICAO
ATPL Airline Transport Pilot Licence
ATS Air Traffic Service(s)
ATSB Australian Transport Safety Bureau
ATSO Australian Technical Standard Order CASR Part 21
ATSOA Australian Technical Standard Order Authorisation CASR Part 21
ATTN Attention
ATZ Aerodrome traffic zone ICAO
AUF Australian Ultralight Federation (now Recreational Aviation Australia)
AUTH Authorised, Authorisation
AUW All Up Weight
AUX Auxiliary
AVBL Available
AVG Average
AVGAS Aviation Gasoline
AVM Abrupt Vertical Manoeuvres (by the MIL)
AWB Airworthiness Bulletin
AWIB Aerodrome Weather Information Broadcast
AWK Aerial Work (Air work - general aviation)
AWS Automatic Weather Station
AWTA Advise as to what time is available ICAO
AWY Airway ICAO/AIP
AZM Azimuth ICAO/AIP
B Blue ICAO/AIP
BA Braking action ICAO
BASA Bilateral Aviation Safety Agreement
BASE Cloud Base (met)
BCFG Fog Patches (met)
BCN Beacon (aeronautical ground light)
BCST Broadcast
BDRY Boundary
BECMG Becoming
BETA Manually controlled mode for constant speed propellers or turbo prop aircraft
BFR Before
BIP-M Basic Instruction Package for Meteorologists
BIPMT Basic Instruction Package for Meteorological Technicians
BITE Built In Test Equipment WATOG
BKN Broken (cloud descriptor) (met)
BL... Blowing (followed by DU=dust, SA=sand or SN=snow)
BLDG Building
BLO Below Clouds
BLW Below
BOM Bureau of Meteorology
BOMB Bombing
BR Mist
BRF Short (used to indicate type of approach)
BRG Bearing
BRKG Braking
BRW Brakes release weight
BS Broadcasting Station (Commercial)
BTL Between Layers
BTN Between
C Degrees Celsius (Centigrade)
C Centre (Runway)
CA Course Acquisition
CA/GRO Certified Air/Ground Radio Operator CASR Part 139
CA/GRS Certified Air/Ground Radio Service CASR Part 171
CAA NZ Civil Aviation Authority New Zealand
CAAP Civil Aviation Advisory Publication CAR 1988
CAGRO Certified Air Ground Radio Operation AIP
CAMO Continuing Airworthiness Management Organisation
CAMP Continuous Airworthiness Maintenance Program CASR Part 145
CAO Civil Aviation Order
CAR Civil Aviation Regulations 1988
CAS Calibrated air speed ICAO
CASA Civil Aviation Safety Authority
CASR Civil Aviation Safety Regulations 1998
CAT Category
CAT Clear Air Turbulence
CAVOK Visibility, cloud and present weather better than prescribed values or conditions
CB Cumulonimbus (met)
CBT Competency-based Training
CC Cirrocumulus (met)
CCA Corrected meteorological message (for CCB, CCC..etc., in sequence) (message type designator) ICAO
CCF Capability Check Flight
CCTS Circuits
CD Candela ICAO
CDCCL Critical Design Configuration Control Limit
CDI Course Direction Indicator
CDL Configuration Deviation List CASR Part 43
CDN Coordination (message type designator) ICAO
CEN En Route and Area ATC unit
CEO Chief Executive Officer
CET Clearance Expiry Time
CF Change Frequency to
CFI Chief Flying Instructor CAR 1988
CFIT Controlled Flight into Terrain
CFL Cleared Flight Level
CFM Confirm, I confirm
CG Centre of gravity ICAO
CGL Circling guidance light(s) ICAO
CH This is a channel continuity check of transmission to permit comparision of your record of channel-sequence numbers of messages received on the channel (to be used in AFS as a procedure signal) ICAO
CHG Modification (message type designator) ICAO
CHTR Charter
CI Cirrus (met)
CIDIN Common <a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> data interchange network ICAO
CIR Command Instrument Rating CAR 1988
CIT Near, Over Large Town(s)
CIV Civil
CK Check
CL Centre Line
CLA Clear type of ice formation
CLBR Calibration
CLD Cloud (met)
CLG Calling
CLIAS Climbing Indicated Airspeed
CLMAX Maximum Co-efficient of Lift
CLR Clear, Cleared to... Clearance
CLSD Closed, Close, Closing
CM (cm) Centimetre
CMB Climb to or Climbing to
CMM Component Maintenance Manual WATOG
CMPL Configuration, Maintenance and Procedures
CMPL Completion, Completed, or Complete
CMR Certification Maintenance Requirements
CMSD Commissioned
CNL Cancel
CNL Flight plan cancellation message
CNS Communications, Navigation and Surveillance
COA Certificates of Approval (issued to maintenance organisations) CAR 1988
CofA Certificate of Airworthiness CAR 1988
COM Communications
CONC Concrete
COND Condition
CONS Continuous
CONST Construction, Constructed
CONT Continue(s), Continued
COOR Coordinate, Coordinated
COORD Coordinates
COP Change over point ICAO
CoR Certificate of Registration CAR 1988
COR Correct, Corrected, Correction
COS Conical Surface
COT At the Coast, Coastal
COV Cover, Covered, Covering
CP Chief Pilot CAR 1988
CPDLC Controller-Pilot Data Link Communication ICAO/AIP
CPL Commercial Pilot Licence CAR 1988
CPL Current flight plan ICAO
CRC Cyclic redundancy check ICAO
CRIS Cost Recovery Impact Statement Department of Finance
CRM Crew Resource Management CASR Part 121
CRZ Cruise
CS Cirrostratus (met)
CS Call sign
CSDD Common Support Data Dictionary published by the Air Transport Association of America (ATA). The CSDD replaces the WATOG.
CSU Constant Speed Unit
CTA Control Area
CTAF Common Traffic Advisory Frequency CASR Part 172/AIP
CTAF(R) Common Traffic Advisory Frequency - (Radio)
CTAM Climb to and maintain ICAO
CTC Category Technical Competency CAR 1988
CTC Contact ICAO/AIP
CTL Control
CTN Caution
CTR Control Zone AIP
CU Cumulus (met)
CUF Cumuliform (met)
CUST Customs
CVR Cockpit voice recorder ICAO/AIP
CW Carrier Wave ICAO
CWY Clearway
D Deleted
D Downward (tendency in RVR (Runway visual range) during previous 10 minutes) ICAO
D-ATIS Data Link Automatic Terminal Information Service (pronounced'DEE-ATIS')
D-VOLMET Data Link VOLMET
D... Danger Area (followed by identification)
DA Decision Altitude
DA/H Decision Altitude/Height AIP
DALR Dry Adiabatic Lapse Rate
DAME Designated Aviation Medical Examiner CASR Part 67
DAO Designated Aviation Ophthamologist CASR Part 67
DAP Departure and Approach Procedures AIP
DCD Double channel duplex ICAO
DCKG Docking
DCMSD Decommissioned
DCPC Direct Controller-Pilot Communications
DCS Double channel simplex ICAO
DCT Direct (in relation to flight plan clearances and type of approach)
DE Form (used to preceed the call sign of the calling station) (to be used in AFS as a procedure signal) ICAO/AIP
DEC December
DEG Degrees
DEP Depart, Departure, Departed, Departing, Departure Message
DER Departure End of Runway AIP
DER Designated Engineering Representative FAR
DES Descend to, Descending to
DEST Destination
DETRESFA Distress Phase
DEV Deviation, Deviating
DF Direction Finder/ Finding
DFDR Digital Flight Data Recorder
DFTI Distance from touchdown indicator ICAO
DGA Distance Measuring Equipment or Global Positioning Satellite System Arrival
DH Decision Height ICAO
DIF Diffuse
DISP Displaced
DIST Distance
DIV Diversion, Divert, Diverting
DLA Delay (message type designator) ICAO/AIP
DLIC Data Link Initiation Capability
DLY Daily
DMC Direct Maintenance Cost WATOG
DME Distance Measuring Equipment ICAO/AIP
DMEN DME (International)
DMEP DME (International Precision used in conjunction with Microwave Landing System)
DNG Danger, Dangerous
DOC Direct Operating Cost WATOG
DOC Documents
DoD Department of Defence
DOM Domestic
DP Dew Point Temperature ICAO/AIP
DP Discussion Paper CASA
DPT Depth
DR Dead Reckoning (navigation) ICAO
DR... Low drifting (followed by DU=dust, SA=sand or SN=snow)
DRG During
DS Dust storm
DSB Double sideband ICAO
DTAM Descend to And Maintain
DTG Date-Time Group
DTHR Displaced Runway Threshold
DTRT Deteriorate, Deteriorating
DTW Dual tandem wheels ICAO
DU Dust
DUC Dense Upper Cloud (met)
DUPE This is a duplicate message (to be used in Aeronautical Fixed Service as a procedure signal) ICAO
DUR Duration
DVOR Doppler VOR
DW Dual wheels ICAO
DZ Drizzle
E East, East Longitude
E E E Error (to be used in AFS as a procedure signal) ICAO
<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a> European Aviation Safety Agency
EAT Expected Approach Time
EB Eastbound
ECAR European Civil Aviation Requirement (formerly JAR)
EDTO Extended Diversion Time Operations
EET Estimated Elapsed Time
EFB Electronic Flight Bag
EFC Expect further clearance ICAO
EGNOS European Geostationary Navigation Overlay System
EGPWS Enhanced Ground Proximity Warning System CAR 1988
EHF Extremely high frequency (30,000 to 300,000 MHz) ICAO/AIP
EHR Encumbrance Holder Register CASR Part 47
ELBA Emergency locator beacon-aircraft ICAO
ELEV Elevation
ELR Extra Long Range
ELT(S) Emergency Locator Transmitter (Survival) CAR 1988
EM Engine Manual WATOG
EM Explanatory Memorandum (submitted to EXCO with regulation amendment)
EM Emission
EMBD Embedded in a Layer (to indicate cumulonimbus embedded in layers of other clouds)
EMERG Emergency
EMS Emergency Medical Service
EMS Environment Management System
END Stop-end (related to RVR) ICAO
ENDCE Endurance
ENE East North-East
ENG Engine
ENR En Route
ENRC En Route Chart (followed by name/title)
EOBT Estimated off Blocks Time
EPA Environment Protection Agency
EPIRB Electronic Position Indicating Radio Beacon (marine term.)
EQPT Equipment
ER Here..or herewith ICAO
ERC En-route Chart
ERP Emergency Response Plan
ERSA En-route Supplement Australia AIP
ES Explanatory Statement (tabled with regulations in Parliament)
ESD Electrostatic sensitive discharge
ESDE ESD equipment
ESE East Southeast
ESIR Electronic safety incident report
EST Estimate or estimated or estimate (message type designator)
ETA Estimated Time of Arrival, Estimating Arrival
ETCM Engine trend and condition monitoring
ETD Estimated Time of Departure, Estimating Departure
ETO Estimated Time Over significant point
ETOPS Extended range operations by turbine-engined aeroplanes ICAO
ETP Equi Time Interval
ETT Estimated Time Interval
EV Every
EVU Enforceable Voluntary Undertaking Civil Aviation Act 1988
EXC Except
EXCO Executive Council
EXER Exercises, Exercising, to exercise
EXP Expect, Expected, Expecting
EXTD Extend, Extending, Extended
F Fixed (chart symbol)
<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> Federal Aviation Administration of the USA
<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>OC Foreign Aircraft Air Operator's Certificate CASR Part 129
FAC Facility, Facilities
FADEC Full Authority Digital Engine Control
FAF Final Approach Fix AIP/ICAO
FAL Facilitation of International Air
FAP Final Approach Point AIP/ICAO
FARs Federal Aviation Regulations (Federal Aviation Administration of the USA)
FATO Final approach and take-off area ICAO/AIP
FAWP Final Approach Waypoint
FAX Facsimile Transmission
FBL Light (used to indicate the intensity of WX phenomena, interference or static reports, eg BL RA = light rain)
FC Funnel Cloud (tornado or water spout)
FCST Forecast
FCT Friction coefficient ICAO
FD Fault Detection
FDE Fault detection and exclusion (in relation to GPS equipment)
FDL Fixed Distance Lighting
FDPS Flight Data Processing system
FDS Flight Director System
FEW Few (cloud descriptor)
FFR Flood, Fire Relief
FG Fog
FIA Flight Information Area
FIC Flight Information Centre
FIO Flight Information Office
FIR Flight Information Region ICAO/AIP
FISA Flight information service (automated) ICAO
FISS Flight Information Service Station
FIX Fault Isolation Manual WATOG
FL Flight Level ICAO/AIP
FLD Field
FLG Flashing
FLIR Forward Looking Infra Red
FLR Flares
FLT Flight ICAO/WATOG/AIP
FLTCK Flight check ICAO/AIP
FLUC Fluctuating, Fluctuation, Fluctuated
FLW Follow(s), Following
FLY Fly, Flying
FM From
FM... From (followed by time weather change is forecast to begin)
FMS Flight Management System ICAO
FMU Flow Management Unit
FNA Final Approach
FNPT Flight and Navigation Procedures Trainer ICAO
FOD Foreign Object Damage WATOG
FOI Flying Operations Inspector
FPD Flight Plan Designator
FPL Filed Flight Plan Message
FPM Feet per Minute
FPR Flight Plan Route
FR Fuel Remaining
FREQ Frequency
FRM Fault Reporting Manual WATOG
FRMS Fatigue Risk Management System
FRNG Firing
FRONT Front (relating to weather) ICAO
FRQ Frequent
FS Flight Service (in general)
FSA Flight Safety Australia
FSL Full Stop Landing
FSP Fish Spotting
FSS Flight service station ICAO
FST First
FT Feet
FTD Flight training device CASR Part 60
FTE Full time equivalent
FTO Flight Training Organisation
FU Smoke
FXD Fixed
FZ Freezing
FZDZ Freezing Drizzle
FZFG Freezing Fog
FZL Freezing Level
FZRA Freezing Rain
G Gravity
G Green
G/A Ground-to-air ICAO
G/A/G Ground-to-air and air-to-ground ICAO
GA Go ahead, resume sending (to be used in AFS as a procedure signal) ICAO
GA General Aviation CAR 1988
GAAP General Aviation Aerodrome Procedures
GAMET Area forecast for low-level flights ICAO
GAPAN Honourable Company of Air Pilots, Australia, Inc.
GBAS Ground Based Augmentation System
GCA Ground Controlled Approach
GCN General Computing Network (operated by Airservices Australia)
GDOP Geometric Dilution of Precision
GEN General
GEO Geographic, true
GES Ground Earth Station
GFA The Gliding Federation of Australia
GFY Glider Flying
GHA Ground handling agents
GIVD Gravity Induced Vestibular Dysfunction
GLD Glider
GLOC Gravity Induced Loss of Consciousness
GLONASS Global Orbiting Navigation Satellite System (pronounced 'GLO-NAS')
GM Guidance Material
GMC Ground Movement Chart (followed by name/title)
GND Ground
GNDCK Ground Check
GNS Global Navigation System
GNSS Global navigation satellite system ICAO/AIP
GP Guiding principles CAR 1998
GP Glide Path ICAO/AIP
GP FLG Group Flashing (number) (used in conjunction with aerodrome lighting)
GPI Glide Path Intercept
GPS Global positioning system (see GNSS)
GPWS Ground proximity warning system
GR Hail
GRAD Minimum Required Climb Gradient
GRAS Ground Based Regional Augmentation System
GRASS Grass Landing Area
GRIB Processed meteoroglogical data in the form of grid point values expressed in binary form (aeronautical meterological code) ICAO/AIP
GRVL Gravel
GS Groundspeed
GS Small Hail and/or Snow Pellets
GSE Ground Support Equipment WATOG
GUND Geoid Undulation
H24 Continuous day and night service
HAA Height Above Aerodrome
HAA Helicopter Association of Australia
HAAMC Head of Aircraft Airworthiness and Maintenance Control Aviation Law in Australia, 2004 edition
HAM Head of Aircraft Maintenance CASR Part 145
HAMC Head of Aircraft Maintenance Control CASR Part 145
HAPI Helicopter approach path indicator ICAO
HAT Height Above Threshold
HBN Hazard Beacon
HDF High frequency direction-finding station ICAO
HDG Heading
HDS Hours of Daylight Saving
HEL Helicopter
HF Human Factors
HF High Frequency (3000 to 30,000 KHZ)
HFEM Human Factor and Error Management System
HGFA Hang Gliding Federation of Australia Inc
HGS Heads-up Guidance System
HGT Height, Height Above
HIAL High Intensity Approach Lighting
HIOL High Intensity Obstacle Lights
HIRL High Intensity Runway Lighting
HJ Sunrise to Sunset
HLDG Holding
HLS Helicopter Landing Site
HMI Human-machine Interface
HN Sunset to Sunrise
HO Service available to meet operational requirements
HOFO Head of Flying Operations
HOO Head of Operations
HOSP Hospital Aircraft
HOTAS Head of Training and Standards
HOTC Head of Training and Checking
HP Horse Power
HPA HectoPascal
HR Hours
HS Homestead
HS Service available during hours of scheduled operations
HSL Hold Short Lights
HUD Head Up Display
HURCN Hurricane
HVDF High and very high frequency direction finding stations (at the same location)
HVY Heavy
HVY Heavy (used to indicate the intensity of WX phenomena, eg HVY RA = heavy rain)
HX No specific working hours
HYR Higher
HZ Haze
HZ (hz) Hertz
HZS Horizontal Surface
IA Inspection authorisation
IAC Instrument approach chart (followed by name/title) FAR
IAF Initial Approach Fix ICAO/AIP
IAL Instrument Approach and Landing Chart
IAO In and out of clouds
IAP Instrument Approach Plate
IAR Intersection of air routes
IAS Indicated air speed ICAO
IATA International Air Transport Association ICAO
IAW In Accordance With
IAWP Initial Approach Way-point
IBN Identification Beacon
IC Ice Crystals (MET code)
ICA Instructions for continuing airworthiness (issued by manufacturer or designer)
<a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> International Civil Aviation Organization CAR 1998
ICE Icing, Ice ICAO
ICUS In-command Under Supervision
ID Identifier, identify
IDENT Identification
IF Instrument Flight
IF Intermediate Approach Fix
IFF Identification Friend/Foe
IFR Instrument flight rules
IFSD In-flight Shutdown ICAO/AIP
IG Implementation Group
IGA International general aviation
ILS Instrument Landing System /AIPICAO
IM Inner Marker
IMC Instrument meteorological conditions (other than VMC)
IMC Indirect Maintenance Cost CAR 1988
IMG Immigration WATOG
IMI Interrogation sign
IMPR Improve, Improving, Improvement ICAO
IMT Immediate, Immediately
INA Initial approach
INBD Inbound ICAO
INC In Cloud
INCERFA Uncertainty Phase
INFO Information
INOP Inoperative
INP If not possible
INPR In progress ICAO
INS Inertial Navigation System ICAO
INSTL Install, Installed, Installation
INSTR Instrument
INT Intersection
INTER Intermittent, Intermittently (meteorological)
INTL International
INTRG Interrogator
INTRP Interrupt, Interruption, Interrupted
INTSF Intensify, Intensifying
INTST Intensity
IoA Instrument of appointment
IOC Indirect Operating Cost CAR 1988
IOE Initial Operational Experience WATOG
IPC Illustrated Parts Catalogue
IR Ice on runway WATOG
IREX Instrument Training Examination ICAO
IRM Immediately Reportable Matters ATSB
IRS Internal Reporting System
ISA International Standard Atmosphere
ISB Independent Sideband
ISIM Integrated Safety Investigation Methodology CASA
ISO9000 International Organization for Standardization
ISOL Isolated
ITT Interstage Turbine Temperature
IWI Illuminated Wind Indicator
IWP Intermediate Way-point
J-BAR Jet Barrier
JAA Joint Aviation Authorities (of Europe)
JAR Joint Aviation Requirements (of the European JAA)
JAR-OPS JAR Operations
JTSO Joint Technical Standard Order
JTST Jet Stream
KDR Knowledge Deficiency Report
KG (kg) Kilograms
KHZ (kHz) Kilohertz
KM (km) Kilometers
KMH (km/h) Kilometers per hour
KPA (kPa) Kilopascals
KT (kt) Knots
KW (kw) Kilowatts
L Left (runway identification)
L Locator (see LM, LO)
LAAS Local Area Augmentation System
LAHSO Land and Hold Short Operations
LAME Licensed Aircraft Maintenance Engineer
LAN Inland
LAT Latitude CASR Part 66
LDA Landing distance available
LDG Landing
LDI Landing Direction Indicator ICAO/AIP
LDP Landing decision point
LEN Length
LF Low Frequency (30 to 300 KHZ) ICAO
LGT Light, Lighting
LGTD Lighted
LIH Light Intensity High
LIL Light Intensity Low
LIM Light Intensity Medium
LIOL Low Intensity Obstacle Lights
LIRL Low Intensity Runway Lights
LJR Low Jet Route
LL Lower Limit
LLN Low-level Navigation (by the MIL)
LLO Low Level Operations (by the MIL)
LLZ Localizer
LM Locator (middle)
LMT Local mean time
LO Locator (outer)
LOC Locally, Location, Located, Local
LOE Lane of Entry
LONG Longitude
LOSA Line Operations Safety Audit
LPT Liquid Penetrant Test
LRCS Long-range communication system
LRG Long Range
LRI Line Replaceable Item FAR
LRNS Long-range navigation system
LRU Line Replaceable Unit WATOG
LSA Light Sport Aircraft FAR
LSALT Lowest safe altitude WATOG
LSd CASA's Legal Services Division
LTD Limited
LUL Lowest Usable Level CASA
LV Light and Variable (relating to wind)
LVE Leave, Leaving
LVL Level
LYR Layer, Layered
M Mach number (followed by figures ie .02 = Mach .02)
M (m) Metres (preceded by figures)
M/E Multi-engine
MAAT Manual Authoring and Assessment Tool CASA
MAE Men and Equipment
MAG Magnetic
MAHWP Missed Approach Holding Way-point
MAINT Maintenance
MAN Manual
MAP Aeronautical Maps and Charts
MAP Manifold Air Pressure
MAPT Missed Approach Point
MAR At Sea
MAUW Maximum All Up Weight
MAWP Missed Approach Waypoint
MAX Maximum
MBST Microburst
MBZ Mandatory Broadcast Zone
MCC Multi-crew Co-ordination AIP
MCM Maintenance control manual CASA
MCQFS Manual of criteria for the qualification of flight simulators <a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> Doc 9625-AN/938
MCUR Mean Cycles Between Unscheduled Removals CASR Part 145
MCW Modulated Continuous Wave CASR Part 60
MDA Minimum Descent Altitude WATOG
MDF Medium Frequency Direction Finding Station
MDR Major Defect Report
MEA Minimum En-route Altitude
MED Medical CAR 1988
MEL Minimum equipment list
MERSITAB Manufacturing, Engineering and Related Services Industry Training Advisory Body
MET Meteorological, Meteorology ICAO
MET REPORT Aviation routine weather report CASR Part 66
METAR Aviation routine weather report (in aeronautical meteorological code)
METRAD MET Radar
MF Medium Frequency (300 to 3000 KHZ)
MHZ (mhz) Megahertz
MIFG Shallow Fog
MIL Military
MIL-STD Military Standard
MIN Minutes
MIOL Medium Intensity Obstacle Lights
MIRL Medium Intensity Runway Lights
MISC Miscellaneous
MKR Marker Radio Beacon
MLJ Military Low Jet
MLJR Military Low Jet Route
MLS Microwave Landing System
MLW Maximum Landing Weight
MM Middle Marker
MMEL Master minimum equipment list
MNM Minimum
MNT Monitor, Monitoring, ICAO
MNTN Maintain, Maintained, Maintaining
MOA Military Operating Area
MOC Minimum obstacle clearance (required)
MOD Moderate, Moderately
MOD Moderate (used to indicate the intensity of WX phenomena, interference or static reports, eg MOD RA = moderate rain). ICAO/AIP
MON Above Mountains
MOPS Minimum Operational Performance Standards
MOS Manual of Standards
MOU Memorandum of understanding
MOV Move, Moved, Moving, Movement CAR 1998
MOWP Method of Working Plan
MPD Maintenance Planning Data
MPI Magnetic Particle Inspection
MPL Multi-crew Pilot Licence ATA/FAR
MPS Metres per Second
MPT Magnetic Particle Inspection Technician ICAO Annex 1 'Personnel Licensing'
MRB Maintenance Review Board
MRBR Maintenance Review Board Report
MRG Medium Range ATA/FAR
MRO Maintenance, repair and overhaul
MRP ATS/MET Reporting Point
MS Minus CASR Part 145
MSA Minimum sector altitude
MSAS Multi-function Transport Satellite (MTSAT) Satellite-based Augmentation System
MSDS Material Safety Data Sheets AIP
MSG Message
MSG Maintenance Steering Group
MSG-3 Maintenance Steering Group Logic Process
MSI Maintenance Significant Item ATA/FAR
MSL Mean Sea Level
MSOS Maintenance specific operation specification WATOG
MSSR Monopulse Secondary Surveillance Radar
MT Mountain CASR Part 145
MTBF Mean Time Between Failure
MTBR Mean Time Between Removals
MTBUR Mean Time Between Unscheduled Removals WATOG
MTO Maintenance training organisation WATOG
MTOW Maximum take-off weight WATOG
MTP Maximum Tyre Pressure CASR Part 147
MTSAT Multi-function Transport Satellite AIP
MTTF Mean Time To Failure
MTTR Mean Time To Repair
MTTUR Mean Time To Unscheduled Removal WATOG
MTUR Special Term For Data Transmittal WATOG
MTW Mountain waves WATOG
MVA Minimum Vector Altitude WATOG
MWO Meteorological Watch Office
MX Mixed type of ice formation (white and clear)
N North, North Latitude
N1 Gas Generator Speed
N2 Second Stage Turbine Speed
NAA National Airworthiness Authority (for a country other than Australia)
NAD Non-acqueous Developer
NAIPS National aeronautical information processing system CAR 1998
NANDTB National Aerospace Non-destructive Testing Board
NANU Notice Advisory to NavStar Users AIP
NAP Noise Abatement Procedures
NAS National Airspace System
NASC National AIS System Centre
NAT NAVAID Training
NAV Navigation
NAVAID Navigation Aid
NAWD Non-acqueous Wet Developer
NB Northbound
NBFR Not Before
NC No Change
NDB Non-directional Radio Beacon
NDI Non-destructive inspection
NDT Non-destructive testing
NE Northeast
NEG Negative, No. Permission not granted or, That is not correct CAR 1988
NFRM Notice of Final Rule Making
NG Gas Generator Speed
NGT Night CASA
NIL None
NM Nautical Miles
NML Normal
NNE North North-East
NNW North North-West
NOF International NOTAM Office
NOSIG No Significant Change
NOTAM Notice To Airmen
NOZ Normal Operating Zone AIP
NP Propeller Speed
NPA Non-precision approach (procedures at aerodromes)
NPC Notice of proposed change (consultation for amendment to a MOS)
NPRM Notice of proposed rule making
NSC Nil Significant Cloud CAR 1998
NTA No TAF Amendment CASA
NTL National
NTS Negative Torque Sensing System
NTSB National Transportation Safety Board (of the USA)
NTZ No-transgression zone
NVD Night Vision Device
NVED Night Vision Enhancement Devices AIP/ICAO
NVET National vocational education and training
NVFR Night Visual Flight Rules
NVG Night Vision Goggles (by the MIL) CASR Part 66
NVIS Night Vision Imaging Systems
NW North-West
NXT Next
NZ New Zealand
NZ CAA New Zealand Civil Aviation Authority
NZS New Zealand Standard
O/R On Request
OAR Office of Airspace Regulation
OAT Outside Air Transport
OAT Outside Air Temperature CASA
OBPR Office of Best Practice Regulation
OBPR Office of Best Practice Regulation
OBS Omni Bearing Selector
OBS Observe, Observed, Observation
OBSC Obscure, Obscured, Obscuring
OBST Obstacle
OBSTR Obstruction
OC Operating Certificate
OCA Obstacle Clearing Altitude
OCA Oceanic Control Area
OCC Occulting (light)
OCH Obstacle Clearance Height
OCNL Occasional, Occasionally
OCTA Outside Control Area
OCTR Outside Control Zone
OEI One Engine Inoperative
OEM Original Equipment Manufacturer
OFZ Obstacle Free Zone
OHD Overhead
OHS Occupation Health and Safety
OHSMS Occupational Health and Safety Management Systems
OIS Obstacle Identification Surface
OLC Office of Legal Counsel
OLDI On-line Data Interchange
OLS Obstacle Limitation Surface
OM Operations Manual
OM Outer Marker
OPA Opaque, white type of ice formation
OPC Office of Parliamentary Counsel
OPMET Operational Meteorological
OPN Operational Notification Message (message type designator)
OPN Open, Opening, Opened
OPR Operator, Operate, Operative, Operating, Operational
OPS Operations
OSIP Overhaul and Special Inspections Periods
OT Other Times CASA
OTAC Overseas Territories Aviation Circulars Air Safety Support International (UK)
OTAR Overseas Territories Aviation Requirements Air Safety Support International (UK)
OTLK Outlook (used in Sigmet messages for volcanic ash and tropical cyclones) Air Safety Support International (UK)
OTP On Top Air Safety Support International (UK)
OUBD Outboard
OVC Overcast
OW Over Water
P.. Prohibited Area (followed by identification)
PA Precision Approach
PAL Pilot Activated Lighting
PANS Procedures for Air Navigation Services
PANS-OPS Procedures for Air Navigation Services - Aircraft Operations <a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> Doc 8168 Vol I and II
PAPI Precision Approach Path Indicator
PAR Precision Approach Radar ICAO
PARL Parallel
PATC Precision Approach Terrain Chart (followed by name/title)
PAX Passengers
PBM Power Plant Build-Up Manual
PC Personal Computer
PCATD Personal Computer-based Aviation Training Device WATOG
PCD Proceed, Proceeding
PCL Pilot Controlled Lighting
PCN Pavement classification number
PCT Practical consolidation training
PDC Pre-Departure Clearance ICAO/AIP
PDO Product distribution organisation CASR Part 66
PDOP Positional Dilution of Precision
PDSE Pre-departure Service Check CASR Part 144
PEC Pressure Error Correction
PERM Permanent
PFC Porous Friction Course
PFR Preferred Route
PH Public Holiday
PIB Pre-flight information bulletin
PIC Pilot-in-command
PICUS Pilot-in-Command Under Supervision ICAO/AIP
PIFR Private IFR rating CAR 1988
PILS Practice ILS
PIREP Pilot Reports CAR 1988
PJE Parachute Jumping Exercise
PL Ice Pellets WATOG
PLN Flight Plan
PLVL Present Level CASA
PMP Primary Maintenance Process
PN Prior Notice Required
PNR Point of No Return WATOG
PO Dust Devils
POB Persons on Board
POH Pilot Operating Handbook
POSS Possible
PPI Plan Position Indicator
PPL Private Pilot Licence
PPR Prior Permission Required
PPS Precise Positioning Service CAR 1988
PPSN Present Position
PRD Prohibited, Restricted and Danger Areas
PRFG Aerodrome Partially Covered by Fog (MET code)
PRI Primary
PRKG Parking
PRM Precision Runway Monitoring
PRM Precision runway monitoring
PROB Probable, Probability
PROC Procedure AIP
PROV Provisional
PS Plus
PSG Passing
PSN Position
PSP Pierced Steel Plank
PSR Primary Surveillance Radar
PSYS Pressure System(s)
PTBL Portable
PTN Procedure Turn
PTT Push To Talk
PVT Private
PWR Power
QDM Magnetic Heading (zero wind)
QDR Magnetic Bearing
QEC Quick Engine Change Unit AIP
QFE An altimeter set to QFE will read zero when the aircraft is on the runway AIP
QMS Quality Management System WATOG
QNH Altimeter subscale setting to obtain elevation or altitude
QTE True Bearing
QTG Qualification test guide
QUAD Quadrant AIP
R Red
R Right (runway system identification)
R.... Restricted Area (followed by number)
R/T Radio Telephone
RA Rain
RA-Aus Recreational Aviation Australia
RAAA Recreational Aviation Association of Australia
RAAO Recreational Aviation Administrative Organisation
RAC Rules of the Air and Air Traffic Services
RAD Radius
RAeS Royal Aeronautical Society
RAFC Regional Area Forecast Centre
RAG Ragged
RAG Runway Arresting Gear
RAI Runway Alignment Indicator
RAIM Receiver Autonomous Integrity Monitoring
RAM Repair and Maintenance
RAPAC Regional Airspace Users Advisory Committee
RAPIC Radar Picture (MET)
RAS Radar Advisory Service
RASF Regional Aviation Safety Forum
RAT RAM Air Turbine
RCA Reach Cruising Altitude,
RCA Request For Corrective Action
RCC Rescue Coordination Centre
RCH Reach, Reaching
RCL Runway Centre Line
RCLL Runway Centre Line Lights
RCLM Runway Centre Line Marking
RDL Radial
RDO Radio
RE... Recent (used to qualify weather phenomena, eg RERA = recent rain) CASA
REC Receive, Receiver, Received
REDL Runway Edge Lights
REF Reference to... Refer to...
REG Registration
RENL Runway End Lights
REP Report, Reported, Reporting, Reporting Point
REQ Request, Requested
RERTE Re-route
RES Reserve Fuel
RESA Runway end safety area
RESTR Restrictions
REV Review ICAO/AIP
RFACA Royal Federation of Aero Clubs of Australia
RFC Request for change
RFC Regional Forecasting Centre (Met)
RFFS Rescue and Fire Fighting Services
RH Radio Height
RHC Right-hand Circuit CASA
RIF Reclearance in Flight
RIFTO Restricted Instrument Flight Take-off
RIS Regulation Impact Statement OBPR
RIS Radar information service
RL Report Leaving ORR
RLA Relay to AIP/ICAO
RLLS Runway Lead-in Lighting
RMIT Royal Melbourne Institute of Technology
RMK Remark(s)
RMS Root Mean Square
RNAV Area navigation
RNP Required navigation performance
RO Registered operator AIP
ROBEX Regional OPMET Bulletin Exchanges
ROC Rate of Climb CASR Part 43
ROD Rate of Descent
ROFOR Route Forecast (in aeronautical meteorological code)
RPA Rules and practices for aerodromes
RPI Radar Position Indicator
RPI Regulatory Performance Indicator CAR 1988
RPI Runway Point of Intercept
RPL Recognition of prior learning CAR 1988
RPM Revolutions Per Minute
RPT Regular public transport CASR Part 66
RQ Require(d)
RQMNTS Requirements CAR 1988
RR Report Reaching
RRM Routine Reportable Matters
RSC Rescue Sub-Centre CASA
RSCD Runway Surface Condition CASA
RSP Responder Beacon
RSR En route Surveillance Radar
RTB Return to Base
RTCA Radio Technical Commission for Aeronautics CASA
RTE Route
RTF Radio Telephone
RTHL Runway Threshold Light(s)
RTIL Runway Threshold Identification Lights
RTN Return, Returned, Returning
RTO Rejected take-off
RTO Registered training organisation
RTS Return to Service AIP
RTZL Runway Touchdown Zone Light(s) CASR Part 147
RVR Runway visual range
RVSM Reduced Vertical Separation Minimum
RWS Runway Strip AIP/ICAO
RWY Runway ICAO/CAR 1988
S South, South Latitude
S-I Straight-In
S/E Single-engine AIP
SA Sand WATOG
SA Selective Availability
SA Situation Awareness
SAAA Sport Aircraft Association of Australia
SAL Supplementary Airline Licence
SALR Saturated Adiabatic Lapse Rate
SALS Simple Approach Lighting System
SAR Search and Rescue
SARPs Standards and Recommended Practices ICAO
SARTIME Time search action required
SARWATCH Search and Rescue Watch ICAO
SATCOM Satellite Communication
SB Service Bulletin
SB Southbound
SBAS Satellite Based Augmentation System
SC Stratocumulus
SCC Standards Consultative Committee
SCP Safety Critical Personnel
SCT Scattered (meteorological) CASA
SDBY Standby
SDC Standard Departure Clearance
SDR Service difficulty report
SE South East
SEA Sea (used in connection with sea-surface temperature and state of the sea) CAR 1998
SEACO Single engine aircraft only
SEC Seconds
SECN Section
SECT Sector
SELCAL Selective Calling System
SER Service, Servicing, Served
SEV Severe (used eg to qualify icing and turbulence report)
SFC Surface
SFL Sequenced Flashing Lights
SG Snow Grains
SH... Showers (followed by RA=rain, SN=snow, PL=ice pellets, GR=hail, GS=small hail and/or snow pellets or combinations thereof, eg, SHRASN = showers of rain and snow)
SHF Super High Frequency (3,000 to 30,000 MHZ)
SHP Shaft Horse Power
SID Standard instrument departure
SIF Selective Identification
SIG Significant ICAO/AIP
SIGMET Information concerning en route weather phenomena which may affect the safety of aircraft operations
SIL Service Information Letter
SIMUL Simultaneous, or Simultaneously
SKC Sky Clear
SKED Schedule, Scheduled
SL Service Letter
SLP Speed Limiting Point
SLW Slow, Slowly
SM Safety Manager
SMC Surface Movement Control
SMR Surface Movement Radar
SMS Safety management system
SN Snow
SNOWTAM A special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area CAR 1998
SOC Start of Climb
SOE Schedule of experience
SOM (SoM) System of Maintenance
SOPs Standard Operating Procedures CAR 1988
SOR Summary of responses CAR 1998
SOT Start of TORA (take-off)
SP Single Pilot CASA
SPA Sport Aviation
SPECI Aviation Special Weather (in aeronautical meteorological code)
SPFIB Specific Preflight Information Bulletin
SPOT Spotwind
SPS Standard Positioning Service
SQ Squall
SR Sunrise
SRB Safety Review Board
SRD Standard Radar Departure
SRG Short Range
SRM Structural Repair Manual
SRR Search and Rescue Region
SRY Secondary WATOG
SS Sandstorm
SS Sunset
SSB Single Sideband
SSCRO Senate Standing Committee on Regulations and Ordinances
SSE South South-East
SSI Structural Significant Item
SSM System Schematics Manual
SSR Secondary Surveillance Radar WATOG
SST Supersonic Transport WATOG
SSW South South-West
ST Stratus
STA Straight in Approach
STAR Standard Arrival Route
STAR Standard instrumental arrival
STARs Standard terminal arrival routes AIP
STC Supplemental Type Certificate ICAO
STD Synthetic training device
STD Standard CASR Part 21
STF Stratiform CASR Part 60
STN Station
STNR Stationary
STODA Supplementary Take-off Distance
STOL Short Take-off and Landing
STS Status
STWL Stopway Light(s)
SUBJ Subject to
SUP Supplement (AIP Supplement)
SUPPS Regional Supplementary Procedures
SVCBL Serviceable
SVY Survey Operations
SW South-West
SWS Soft Wet Surface
SWY Stopway
T Temperature
T-VASIS 'T'Visual Approach Slope Indicator System (pronounced 'TEE-VAR-SIS')
TA Transition Altitude
TA Traffic advisory
TAAATS The Australian Advanced Air Traffic System
TAAM Airservices Australia's Total Airspace Airport and Aerodrome Modeller ICAO/AIP
TAC Terminal Area Chart
TACAN Tactical Air Navigation Aid
TAF Aerodrome Forecast
TAF Terminal Area Forecast
TAIL Tailwind
TAR Terminal Area Surveillance Area
TAS True Airspeed
TAT Terminal Area Thunderstorm Service (meteorological term)
TAWS Terrain awareness and warning system
TAWS-B+ system A terrain awareness and warning system that is equipped with a visual display and complies with the requirements for Class B equipment expressed in TSO-C151, TSO-C151a or TSO-C151b.
TAX Taxiing, Taxi CAO 20.18
TBA To be advised CAO Part 20, Section 20.18, Issue 9
TBO Time Between Overhauls
TC Type Certificate
TC Tropical Cyclone WATOG
TCAC Tropical Cyclone Advisory Centre
TCAS Traffic alert and collision avoidance system CASA
TCDS Type certificate data sheet
TCH Threshold Crossing Height ICAO
TCO Training and Checking Organisation CASR Part 21
TCTA Trans-continental Control Area
TCU Towering Cumulus (met)
TDO Tornado
TDZ Touchdown Zone
TECR Technical Reason
TEL Telephone
TEM (Illustrated) Tool And Equipment Manual
TEM Threat and Error Management
TEMPO Temporary, Temporarily (meteorologically) WATOG
TERPs Terminal and En-route procedures
TFC Traffic
TFR Terrain Following Radar (by the MIL)
TGL Touch & Go Landing
TGS Taxiing Guidance System
THR Threshold
THRU Through
TIBA Traffic Information Broadcasts by Aircraft
TIL Until
TIP Until Past (place)
TIS Time in service
TKOF Take-off
TLOF Touchdown and lift-off area
TLS Transponder Landing System
TLW Time Limited WIP (work in progress) ICAO
TMA Terminal Control Area
TMG Track Made Good
TNA Training Needs Analysis
TNA Turn Altitude
TNH Turn Height
TNS Transitional Surface
TOC Top of Climb
TODA Take-off distance available
TOP Cloud Top
TORA Take-off run available ICAO
TOT Turbine Outlet Temperature
TP Turning Point ICAO
TR Track
TRA Temporary Reserved Airspace
TRAN Transition
TRANS Transmits, Transmitter
Trike A manned, powered hang-glider
TRL Transition Level
TROP Tropopause
TS... Thunderstorm (followed by RA=rain, SN=snow, PE=ice pellets, GR=hail, GS=small hail and/or snow pellets or combinations thereof, eg TSRASN = thunderstorm with rain and snow)
TSI Time Since Installation
TSO Technical Standard Order
TSO Time Since Overhaul WATOG
TTF Trend Type Forecast
TTMRA Trans Tasman Mutual Recognition Agreement WATOG
TURB Turbulence
TWR Aerodrome Control Tower, Aerodrome Control
TWY Taxiway
TWYL Taxiway Link
TYP Type of Aircraft
TYPH Typhoon
U/S Unserviceable
UAB Until Advised By
UAV Unmanned aerial vehicles
UDF UHF Direction Finding Stations
UFIT Uncontrolled Flight Into Terrain CASR Part 101
UFN Until Further Notice
UHDT Unable Higher Due Traffic
UHF Ultra High Frequency (300 to 3,000 MHZ)
UIR Upper Flight Information Region
UK United Kingdom
UL Upper Limits
UNA Unable
UNAP Unable to Approve
UNICOM Universal Communications
UNL Unlimited
UNLC Unlicensed
UNREL Unreliable
US FAR Federal Aviation Regulations (of the USA)
USA United States of America
UTA Upper Control Area
UTC Coordinated Universal Time
V Velocity
V1 Take-off Decision Speed
V2 Take-off Safety Speed (Applicable to Larger Multi-engine Aircraft)
VA Volcanic Ash
VA Maximum Manoeuvring Speed
VAA-H Visual Approach Area - Helicopter
VAAC Volcanic Ash Advisory Centre
VAC Visual Approach Chart (followed by name/title)
VAL In Valleys
VAR Magnetic Variation
VASIS Visual Approach Slope Indicator System
VC Vicinity of the aerodrome (followed by FG=fog, FC=funnel cloud, PO=dust/sand whirls, BLDU=blowing dust, BLSA=blowing sand or BLSN=blowing snow; eg, VCFG=vicinity fog
VCY Vicinity
VDF VHF Direction Finding Station
VEC Visual En-route Chart
VER Vertical
VFE Flap Extension Speed
VFR Visual flight rules
VHF Very High Frequency (30 to 300 MHZ)
VHFCOM Very High Frequency Communications
VIA By way of...
VIMD Maximum Drag Speed
VIP Very Important Person
VIS Visibility
VLE Maximum Speed with Landing Gear Extended
VLF Very Low Frequency (3 to 30 KHZ)
VLJ Very Light Jet
VLO Landing Gear Operating
VLO2 Landing Gear Operation Down
VLR Very Long Range
VMAN Visual Manoeuvre Speed
VMC Visual Meteorological Conditions
VMC Minimum Control Speed
VMCA Minimum Control Airspeed Airborne (Red line speed)
VMCG Minimum Control Airspeed on the Ground
VMO Maximum Structural Cruising Speed
VNAV Vertical Navigation
VNE Never Exceed Speed
VNO Normal Operating Speed ICAO
VOLMET Meteorological Information for Aircraft in Flight ICAO
VOR VHF Omni-directional Radio Range (OMNI)
VP Variable Pitch Propellers
VR The speed at which the aircraft is rotated to lift off from the runway
VRB Variable
VSI Vertical Speed Indicator
VSI Clean Stall Speed
VSL Vertical speed limit
VSO Stalling speed, minimum steady flight speed in the landing configuration
VSO Stall speed with undercarriage and flap selected ICAO
VSSE Safe single-engine Speed CAR 1998
VTC Visual Terminal Chart
VTOL Vertical take-off and landing
VTOSS Take-off Safely Speed
VX Best Angle of Climb Speed ICAO
VXSE Best Single-engine Angle of Climb Speed
Vy Best Rate of Climb Speed
VYSE Best Single-engine Rate of Climb Speed (Blue line speed)
W Watt
W West, West Longitude
W White
W/V Wind Velocity
WAAS Wide Area Augmentation System
WAC World Aeronautical Chart <a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> 1:1,000,000 (followed by name/title)
WAFC World Area Forecast Centre
WAFS World Area Forecast System
WATIR Weather and Terminal Information Reciter
WATOG World Airlines Technical Operations Glossary
WB Westbound
WBM Weight And Balance Manual
WDI Wind Direction Indicator
WDSPR Widespread WATOG
WED Wednesday
WEF With Effect From, Effective From
WGS-84 World Geodetic System 1984
WI Within
WID Width
WIE With Immediate Effect, Effective Immediately
WILCO Will Comply
WIND Wind (used in connection with direction and speed) WINTEM Forecast upper wind and temperature at specified points (in aeronautical met code)
WIP Work in Progress
WKN Weaken, Weakening
WM Wiring Manual
WMO World Meteorological Organisation
WNW West North-West WATOG
WO Without
WPT Way-point
WRNG Warning
WS Wind Shear
WSW West South-West
WT Weight
WTSPT Water Spout
WWW World Wide Web
WX Weather
X Cross
XBAR Crossbar (of approach lighting system)
XNG Crossing
XS Atmospherics
XSEC Extra Section
Y Yellow
YCZ Yellow Caution Zone WATOG
YR Your/s
Z Coordinated Universal Time (in meteorological messages)
AAE above aerodrome elevation
AAIB Air Accidents Investigation Branch (United Kingdom)
AAO assumed adverse obstacle
AAS airport advisory service
A/C aircraft
AC advisory circular
ACAM aircraft continuous airworthiness monitoring
ACARS Aircraft Communication and Addressing Reporting System
ACAS airborne collision avoidance system
ACC area control centre
ACC active clearance control
ACC Accessory
ACFT aircraft
ACI Airports Council International
ACM air cycle machine
ACMS aircraft condition monitoring system
ACP Audio Control Panel
ACU air condition unit
ACU alternator control unit
AD airworthiness directive
A/D aerodrome
ADA advisory area
ADAHRS air data attitude heading reference system
ADC air data computer
ADD acceptable deferred defect
ADF automatic direction finder
ADI Attitude Director Indicator
ADIRU air data inertial reference unit
ADIRS Air Data Inertial Reference System
ADIZ Air Defense Identification Zone
ADJ Adjustment
ADM air data module
ADS automatic dependent surveillance
ADV Arbeitsgemeinschaft Deutscher Verkehrsflugh?fen German Airports Association
AEA Association of European Airlines
AFCS automatic flight control system
A/FD Airport/Facility Directory
AFDS autopilot flight director system
AFE above field elevation
AFS aeronautical fixed service
AFT Aft The direction against the aircraft movement
AFTN Aeronautical Fixed Telecommunication Network
AGB accessory gear box
AGL above ground level
AHRS Attitude and heading reference system
AIP Aeronautical Information Publication
AIRAC Aeronautical information regulation and control
AIRMET Airmen's Meteorological Advisory
ALI Airworthiness Limitation Item
ALS approach lighting system
ALT Altitude
ALT Alternate
ALUM Aluminum
AMC Acceptable Means of Compliance (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
AME Aviation Medical Examiner
AMM Aircraft Maintenance Manual
AMO Approved Maintenance Organization
AMSL above mean sea level
AMP aircraft maintenance program
ANSP air navigation service provider
ANSP Authorization of Aircraft Network Security Program (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
ANPT Aeronautical national pipe taper
ANSOG Airport Network Security Operator Guidance (Boeing)
A/O Air oil
AOA angle of attack
AOC air operator's certificate
AOG aircraft on ground
AOM aircraft operations manual / airport/aerodrome operating minima
AP autopilot
A/P airplane (US), aeroplane (<a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a>)
APP Appendix
APPL Application
APPROX Approximately
APT airport
APU auxiliary power unit
APV approach procedure with vertical guidance
AR airworthiness review
AR authorization required
AR As required
ARC airworthiness review certificate
ARINC Aeronautical Radio Inc.
ARO airport reservation office
ARP aerodrome reference point
ARTCC air route traffic control centers
ASAS Airborne Separation Assurance System
ASDA Association for Scientific Development of Air Traffic Management in Europe
ASI airspeed indicator
ASL above sea level
ASLO Aircraft Security Logging Overview
ASM airspace management
assy assembly
A/S Anti-Skid
A/T autothrottle
A/THR Autothrust
ATA Air Transport Association
ATC air traffic control
ATD actual time of departure
ATF aerodrome traffic frequency
ATFM air traffic flow management
ATIS Automatic Terminal Information Service
ATM air traffic management
ATN Aeronautical Telecommunication Network
ATO Approved Training Organisation
ATPL Airline Transport Pilot Licence
ATQP Alternative Training and Qualification Programme
ATS air traffic service
AVAIL available
AWBS Aviation weather briefing service
AWG American Wire Gage
AWIS Aviation weather information service
AWOS Automated weather observation system
AWWS Aviation weather web site[6]
BC back course
BCAA Belgian Civil Aviation Authority
BDC bottom dead centre
BFL balanced field length
BHP brake horsepower
BITE Built-In Test Equipment
BL Butt Line
B/P Blue Print
BPR bypass ratio
BOM bill of material
BTV Brake-to-Vacate System
BWC bird watch condition
BVID Barely Visible Impact Damage
BVR Beyond Visual Range
C2 command and control
CA Captain
CAA Civil Aviation Authority
CAME Continuing Airworthiness Management Exposition
CAMO Continuing Airworthiness Management Organisation
CAMP Continuous Airworthiness Maintenance Program (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
CANSO Civil Air Navigation Services Organisation
CAP cabin attendant panel
CAR civil aviation regulation
CARs civil aviation regulations[7][8]
CARS Canadian Aviation Regulations
CAS calibrated airspeed
CASS Commercial Air Service Standards
CASS continuing analysis and surveillance system
CAT clear air turbulence
CAT Commercial Air Transport
CAW continuing airworthiness (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
CBT computer based training
CCRs closed circuit mixed gas rebreathers
CCRs constant current regulators
CDCCL critical design configuration control limitation
CDI course deviation indicator
CDL configuration deviation list
CDU control/display unit
CFIT controlled flight into terrain
CFG constant frequency generator
CFR Code of Federal Regulations
CG center of gravity
CH Course Heading
CHDO certificate-holding district office (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
CI cost index
CMC central maintenance computer
CMM component maintenance manual
CMO Certificate Management Office (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
CMV converted meteorological visibility
CMPA complex motor-powered aircraft
CofA Certificate of airworthiness
CPDLC controller
CPR Changed product rule (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
CRD Comment-response document (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
CRES Corrosion resistant steel
CS certification specification (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
CSD constant speed drive
CSO cycles since overhaul
CSS cabin services system
CSU constant speed unit
CSCT Configuration Item Signer Crater Tool (Boeing)
CTAF common traffic advisory frequency
CTR controlled traffic region/control zone
CVR cockpit voice recorder
CWS control wheel steering
D Compass Deviation
DA density altitude
DA/H decision altitude/height (rel. to THR) See instrument landing system
DAH design approval holder (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
DER departure end of runway
DER Designated Engineering Representative
DEU display electronic unit
DG directional gyro
DGPS differential GPS
DGR Dangerous Goods Regulation
DIA diameter
DLR German Aerospace Center / Deutsches Zentrum f
DME distance measuring equipment
DME Designated Mechanic Examiner
DMI deferred maintenance item
DO design organization
DOA design organization approval (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
DOM design organization manual
DODAR diagnose, options, decide, act/assign, review
DOW dry operational weight
DP Departure Procedures
DR dead reckoning
DUATS Direct User Access Terminal Service
DWC dog watch condition
EA engineering authorisation
EADI Electronic Attitude Direction indicator
EAS equivalent airspeed
EC engineering control (also E/C)
EFC Expect Further Clearance
EAT expected approach time
<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a> European Aviation Safety Agency
EBOM engineering Bill of Material
EBU engine build-up
ECAM electronic centralised aircraft monitor
ECET end of civil evening twilight
ECR Engineering Change Request
ECS Environmental control system
EDR engineering data record
EDTO extended diversion time operations
EEC electronic engine control
EET estimated elapsed time
EFB electronic flight bag
EFFRA engine failure flap retraction altitude
EFIS electronic flight instrument system
EFP engine failure procedure
EFS elevator feel shift
EFTO engine failure on take-off
EGPWS enhanced ground proximity warning system
EGT exhaust gas temperature
EHM engine health monitoring
EHSI Electronic Horizontal Situation Indicator
EICAS engine-indicating and crew-alerting system
E-LSA experimental light-sport aircraft
ELAC elevator and aileron computer
ELOS Equivalent Level of Safety
ELT emergency locator transmitter
EMAS engineered materials arresting system
EMDP electric motor driven pump
EOBT estimated off-blocktime
EPA European part approval (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
EPR engine pressure ratio
ERM engineering request for maintenance
ESA emergency safe altitude
ETA estimated time of arrival
ETD estimated time of departure
ETE estimated time en route
ETOPS Extended-range Twin-engine Operation Performance Standards, see ETOPS
ETSO European Technical Standard Order, issued by <a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>; see TSO
EUROCAE European Organisation for Civil Aviation Equipment
EVAS emergency vision assurance system
EW Empty Weight
<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> U.S. Department of Transportations' Federal Aviation Administration
FADEC full authority digital engine control
FAC Flight Augmentation computer
FAF final approach fix
FAF [first available flight]
FANS future air navigation system
FAP final approach point
FAP forward attendant panel
FAR Federal Aviation Regulation
FAROS final approach runway occupancy signal
FATO final approach and take off
FBO fixed-base operator
FB Winds aloft
FBW fly-by-wire
FC flight crew
FCF functional flight check
FCOM flight crew operating manual
FCU fuel control unit
FD flight director
FD upper winds and temperature forecast
FDM flight data monitoring
FDR flight data recorder (also known as black box)
FEP final end point
FFDZ free fall drop zone (parachutists)
FIC flight information centre
FFS full flight simulator
FIDO Fog Investigation and Dispersal Operation
FIKI Flight Into Known Icing
FIR flight information region
FISE flight information service enroute
FL flight level
FM frequency modulation
FMA flight mode annunciator
FMC flight management computer (part of a FMS)
FMGC flight Management and guidance computer
FMS flight management system
F/O First Officer
FOD foreign object damage
FOO flight operation officer
FOQA flight operational quality assurance
FPA flight path angle
FPL filed flight plan
FPM feet per minute
FSDO Flight Standards District Office (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
FSF Flight Safety Foundation
FSIMS Flight Standards Information Management System (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
FSS flight service station
FTL flight time limitations
FVU flux valve unit
GA general aviation
G/A or GA go-around
GBST ground-based, software tool
GCA Ground-controlled approach
GCU generator control unit
GEA Ground effect area
GLOC g-induced loss of consciousness
GM guidance material (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
GMM general maintenance manual
GND ground
GP glide path
GPP general practices and procedures
GPS Global Positioning System
GPU Ground Power Unit
GPWS ground proximity warning system
G/S glideslope
GS groundspeed
GSE ground support equipment
H Heavy (in the context of wake turbulence categories)
H High
HAT Height Above Touchdown
HAZMAT Hazardous Material
HDG Heading
HDI Heading Indicator
HFE Human Factors Engineering[9]
HFES Human Factors and Ergonomics Society
HIGE Hover In Ground Effect
HIRL High Intensity Runway lighting
HIRO High Intensity Runway Operation
HIRTA High Intensity Radio Transmission Area
HIWAS Hazardous Inflight Weather Advisory Service
HL Height loss
HLD hold (hold altitude or speed or something else) (same as maintain, but not maintenance!)
HMG hydraulic motor generator
HMU hydro-mechanical unit
HOGE Hover Out of Ground Effect
HPA human-powered aircraft
HPC high pressure compressor
HPT high pressure turbine
HPTACC high pressure turbine active clearance control
HSI horizontal situation indicator
HUD head-up display
HUM Human Remains
HW headwind
HYD hydraulic
HYDIM hydraulic interface module
IB Inboard
IAC instrument approach chart
IAF initial approach fix
IAP instrument approach procedure
IAS indicated airspeed
IATA International Air Transport Association
ICA Instructions for Continuous Airworthiness
<a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> International Civil Aviation Organization
ICAS International Council of the Aeronautical Sciences
ICD Interface Control Document
ICO idle cut-off
ICTS Ice Contaminated Tailplane Stall
IDG integrated drive generator
IDT identify (XPDR)
IEPR integrated engine pressure ratio
IETM interactive electronic technical manual
IF intermediate approach fix
IFA International Federation of Airworthiness
IFATCA International Federation of Air Traffic Controllers' Associations
IFE In Flight Entertainment
IFP instrument flight procedure
IFR instrument flight rules
IFSD in-flight shutdown
IGV Inlet guide vane
ILS instrument landing system
IMC instrument meteorological conditions
IML Inside Mold Line
IPC Illustrated Parts Catalog (e.g. by Boeing, Airbus)
IR Initial Release
IR Initial Release
IRS inertial reference system
IRT instrument rating test
IRVR instrumented runway visual range
ISA International Standard Atmosphere
ISFD integrated standby flight display
ISIS integrated standby instrument system
ITAR International Traffic in Arms Regulations
ITT interstage turbine temperature
JAA Joint Aviation Authorities
JAR Joint Aviation Requirements
KCAS knots calibrated airspeed
KIAS knots indicated airspeed
KRE key risk element
KTAS knots true airspeed
L Light (in the context of wake turbulence categories)
LAHSO Land And Hold Short Operations
LAME licensed aircraft maintenance engineer
LCC low-cost carrier
LCG load classification group
LCN load classification number
LDA localizer type directional aid
LHO live human organs
LIR Loading Instruction Report
LKP last known position
LLC Life Limited Component
LLP Life Limited Part (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>, <a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a>)
LLZ localizer (ILS)
LM land and marine
LNAV lateral navigation
LOA letter of authorization (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
LOC loss of control; localizer
LOFT line-oriented flight training
LOM limitation of movement
LOM locator outer marker
LOTC loss of thrust control
LPC low pressure compressor
LPT low pressure turbine
LPTACC low pressure turbine active clearance control
LPV localizer performance with vertical guidance
LRC long range cruise
LRU line-replaceable unit
LSAP loadable software aircraft part (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
LSAS longitudinal stability augmentation system
LTC line training captain
LTP landing threshold point
LVP low visibility procedures
LW landing weight
M medium (in the context of wake turbulence categories)
MAC mean aerodynamic chord
MAC mid-air collision
MAP missed approach point or manifold absolute pressure
MATS Manual of Air Traffic Services
MBC Main Base Check
MCAS Maneuvering Characteristics Augmentation System
MCDU multifunction control display unit
MCH Manufacturer Certificate Holder (TCCA); see also PAH and POA
MCP mode control panel
MCT maximum continuous thrust
MCDU multi control display unit
MDA minimum descent altitude
MDDR maintenance deferred defect record
MDH minimum descent height
MDM multi-disciplinary measure (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
ME Manufacturing Engineer
MEA Minimum En-route Altitude
MEDEVAC medical evacuation
MEF maximum elevation figure
MMEL master minimum equipment list
MEL minimum equipment list
MEP multi-engine piston
METAR meteorological aerodrome report (METAR)
MFD multi function display
MH Magnetic Heading
ML maintenance laptop
MLDW maximum landing weight
MLG Main Landing Gear
MLS microwave landing system
MM middle marker
MOCA Minimum Obstacle Clearance Altitude
MOE maintenance organisation exposition
MORA Minimum Off Route Altitude
MP manifold pressure
MPL multi-crew pilot license
MRB Material Review Board
MRO maintenance, repair, overhaul
MRO maintenance and repair organization
MROT Minimum Runway Occupancy Time
MRP Material Resources Planning
MRW maximum ramp weight
MSA minimum safe altitude
MSDS Material Safety Data Sheet
MSL mean sea level
MSLW Max. Structural Landing Weight
MSTOW Max. Structural Take-off Weight
MTOW maximum take-off weight
MSZFW Max. Structural Zero Fuel Weight
MVA Minimum Vectoring Altitude
MX Maintenance
MZFW maximum zero-fuel weight
NADP noise abatement departure procedure
NDB non-directional beacon
NDT non-destructive testing
NGS nitrogen generation system
NHA next higher assembly
NIST National Institute of Standards and Technology
NLG nose landing gear
NNC non-normal checklist
NORDO no radio
NOTAM notice to airmen
NOTAR no tail rotor
NPA non-precision approach
NPA notice of proposed amendment (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
NPRM notice of proposed rulemaking (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>)
NRR noise reduction rating
NRTC nonroutine task card
NTZ no-transgression zone
OAT outside air temperature
OBE overcome by events
OBS omni-bearing selector
OCA obstacle clearance altitude
OCCM on condition / condition monitored components
OCH obstacle clearance height
OEI one engine inoperative
OEM original equipment manufacturer
OGV outlet guide vane
OHM overhaul manual
OIS obstacle identification surface
OM outer marker
ONS onboard network system
ONAT Onboard Network Access Terminal
OTS out of service
OPC operational check
OPS/CHK operational check
OW operational weight
P (as a prefix:) prohibited airspace
PA pressure altitude
PAH production approval holder (<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>); see also POA and MCH
PANS-OPS procedures for air navigation services
PAPI precision approach path indicator
PAOG Pre Aircraft on Ground
PAR precision approach radar
PATWAS Pilot's Automatic Telephone Weather Answering Service
PAX passenger
PBCS performance-based communication and surveillance
PBD place bearing distance (RNAV waypoint)
PBE Protective Breathing Equipment
PBN Performance-Based Navigation
PCN pavement classification number
PDA performance degradation allowance
PDG procedure design gradient
PDAS public domain aeronautical software
PDU power drive unit (flap actuation)
PET point of equal time
PF pilot flying
PFD primary flight display
PFAF precision final approach fix
PIC Pilot In Command
PICUS Pilot In Command, under supervision[10]
PIO Pilot Induced Oscillations
PIP performance improvement package
PIREP Pilot Report
PJE Parachute jumping exercise
PM pilot monitoring
PMA Parts Manufacturer Approval
PMG Permanent magnet generator
PN part number (also P/N)
PNF pilot not flying
PNR Point of No Return
POA Production Organisation Approval (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>); see also PAH and MHC
POB persons on board
POH Pilot's Operating Handbook
POF Principles Of Flight
PPL private pilot licence
PPR prior permission required
PS passenger step
PSR point of safe return
PSR power supply reset
PSR primary surveillance radar
PSU passenger service unit
PTF permit to fly
PTT push to talk
PTU power transfer unit
PYLD payload
R (as a prefix:) restricted airspace
RA radio altitude or radar altimeter
RA resolution advisory (in the context of TCAS)
RAAS Runway Awareness and Advisory System
RAAS remote airport advisory service
RAIM Receiver Autonomous Integrity Monitoring
RAREPS Weather Radar Reports
RAS rectified air speed
RA(T) restricted area (temporary)
RAT ram air turbine
RCO remote communications outlet
RDH reference datum height for ILS
REO Repair engineering order
RFF rescue and fire fighting
RFI recreational flight instructor
RGB reduction gear box
RIA regulatory impact assessment (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
RII required inspection items
RMI radio magnetic indicator
RMP Radio Management Panel
RMT rule making task (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
RNAV area navigation
RNP required navigation performance
RPL Recreational Pilot Licence
RPL repetitive flight planning
RPT regular public transport
RSA runway safety area
RSR en-route surveillance radar
RT radiotelephony
RTB return to base
RTL rudder travel limiting
RTO rejected take-off
RTOW regulatory take-off weight
RVDT rotary variable differential transformer
RVR runway visual range
RVSM reduced vertical separation minima
RW ramp weight
RWY runway
SAR Surveillance Approach Radar
SAS stability augmentation system
SB service bulletin
SC special condition
SCAP Standard Computerized Airplane Performance
SDF Simplified directional facility
SEP single-engine piston
SESAR Single European Sky ATM Research
SFCC Slat Flap Control Computer
SFO Senior First Officer
SFOC Template:Special Flight Operating Certificate
SID standard instrument departure
SIGMET Significant Meteorological Information
SLPC single lever power control
SM service manual
SMM safety management document (<a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a>)
SMOH Since major overhaul
SMR surface movement radar
SMT software maintenance tool
SN serial number
SOC start of climb at missed approach
SODPRO simultaneous opposite direction parallel runway operations
SOP standard operating procedure
SOW Statement of Work
SR sunrise
SRM structural repair manual
SS sunset
STAR standard terminal arrival route
STC supplemental type certificate
STOL short take-off and landing
STS speed trim system
TA traffic advisory (see TCAS)
TAA terminal arrival area
TAC thrust asymmetry compensation
TACAN tactical air navigation
TAF terminal aerodrome forecast
TAM total airport management
TAR terminal approach radar
TAS true airspeed
TAT total air temperature
TAWS terrain awareness and warning system
TBO time between overhauls
TBV transient bleed valve
TC towering cumulus
TC turn coordinator
TC True Course
TC type certificate
TCA terminal control area
TCAS traffic collision avoidance system
TCCA Transport Canada's Civil Aviation
TCDS type certificate data sheet
TCH threshold crossing height
TCI thrust computer indicator
TCU terminal control unit
TDZ touchdown zone
TERPS terminal procedures
TFC traffic
TFR temporary flight restriction
TGB transfer gearbox
TGL temporary guidance leaflet
THLD threshold
TH True Heading
THR runway threshold
THS trimmable horizontal stabilizer, see tailplane
TIT turbine inlet temperature
TLD time-limited dispatch
TLB technical logbook (<a href="https://www.easa.europa.eu/abbreviations" target="_blank">EASA</a>)
TLS transponder landing system
TMA terminal manoeuvring area (Europe)/terminal control area (USA and Canada)
TMG touring motor glider
TML Toolbox Mobile Library (Boeing)
TMZ transponder mandatory zone
TOC Top of Climb (also known as T/C)
TOD top of descent
TODA take-off distance available
TO/GA take-off/go around
TOP take-off power
TOR take-off runway
TORA take-off runway available
TOW take-off weight
TOWS take-off warning system
TR transformer rectifier
TP turning point at missed approach
TRA temporary reserved area (airspace)
TRACON terminal radar approach control
TRE type rating examiner
TRP thrust rating panel
TSO technical standard order
TTAF total time air frame
TTSN total time since new
TTSO total time since overhaul
TWB Transcribed Weather Broadcasts
TWC tail wind component
TWLU Terminal Wireless LAN Unit
TWR tower
TWY taxiway
UAS Unmanned Aircraft System[11]
UAV unmanned air vehicle
UHF ultra-high frequency
UIR upper information region
UTC Universal Time Coordinated
V Magnetic Variation
V&V Video & Vision[12]
VASI visual approach slope indicator
VBV variable bleed valve
VCS vehicle control service
VDP Visual descent point
VFR visual flight rules
VG vortex generator
VGM voice generator module
VHF very high frequency
VMC visual meteorological conditions
VNAV vertical navigation
VOR VHF omni-directional range
VIGV Variable Inlet Guide Vane
VSCF Variable speed constant frequency
VSI Vertical speed indicator
VSV Variable Stator Vane
VTA VFR terminal area chart
VTOL vertical take-off and landing
VVI Vertical velocity indicator
VID Visible Impact Damage
V1 speed at or above which takeoff cannot be safely interrupted
V2 speed at or above which takeoff can be done with 1 engine out
Va maneuvering speed
Vfe maximum flaps extended speed
Vle maximum landing gear extension sp
Vlo maximum landing gear operating speed
vlof lift of speed
Vmc minimum control speed
Vmca velocity of minimum control in the air
Vmcg velocity of minimum control on ground
Vmo maximum operating speed
Vne never-exceed speed
Vno normal operating speed limit
Vr rotate speed
Vra Rough Air Speed
Vref reference touchdown speed
Vs stall speed
Vso stall speed in landing configuration
Vx best angle of climb speed
Vy best rate of climb speed
WAC World Aeronautical Chart
WAT weight, altitude, temperature: variables that affect takeoff performance
W&B Weight & Balance
WCA Wind Correction Angle
WEF with effect from
WOFW weight-off-wheels, indicates aircraft is off ground since lift off
WONW weight-on-wheels, indicates aircraft is on ground since touch down
WS wind shear
WTC Wake Turbulence Category
Wx weather
XC cross-country
XMIT transmit
XPDR transponder
XPNDR transponder
Y yaw or yaw angle
Y/D yaw damper
Z Zulu Time (UTC)
ZFT zero-fuel time
ZFW zero-fuel weight
ZULU Zulu Time (UTC)
A-S Anti-spoofing FAA
AC Advisory Circular FAA
AC or ac Alternating current FAA
A/C Aircraft FAA
A/D Analog/Digital converter FAA
A/G Air Ground FAA
AAC Aeronautical Administrative Communication FAA
AAF Associate Administrator for Airway Facilities FAA
AAL Alaskan Regional Headquarters FAA
AAP Advanced Automation Program FAA
AAPO Associate Administrator for the Performing Organization FAA
AAR Office of Aviation Research FAA
AAR Airport Acceptance Rate FAA
AAS Advanced Automated System FAA
AASO Associate Administrator of the Sponsoring Organization FAA
AAT Associate Administrator for Air Traffic FAA
ABCP Airborne Command Post FAA
ABL Allocated Baseline FAA
ABPSK Aviation Binary Phase Shift Keying FAA
ABS Automatic Blink System FAA
AC Alternating Current FAA
ACAA Air Carrier Association of America FAA
ACARS Aviation Communications Addressing and Reporting System FAA
ACAS Airborne Collision Avoidance System FAA
ACC Air Control Center FAA
ACCC Area Control Computer Complex FAA
ACE Central Regional Headquarters FAA
ACEP Airport Capacity Enhancement Plan FAA
ACEPS Air Traffic Control Center Critical/Emergency Power System FAA
ACF Area Control Facility FAA
ACI Adjacent Channel Interface FAA
ACK Acknowledge Signal FAA
ACKCTL Acknowledge Control FAA
ACM Availability Coverage Modeling FAA
ACMS Aircraft Condition Monitoring System FAA
ACN Engineering, Research and Development Service FAA
ACO Aircraft Certification Office FAA
ACS Active Control System FAA
ACSE Access Control and Signaling Equipment FAA
Active Waypoint A waypoint to or from which navigational guidance is being provided. For a parallel offset, the active waypoint may or may not be at the same geographical position as the parent waypoint. When not in the parallel offset mode (operating on the parent rou FAA
ACU Antenna Control Unit FAA
ACV Accuracy Validation FAA
ACWP Actual Cost of Work Performed FAA
ACY Atlantic City, NJ <a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> Technical Center FAA
ACDO Air Carrier District Office FAA
ADAP Airport Development Aid Program FAA
ADC Air Data Computer/Analog to Digital Converter FAA
ADD Algorithm Description Document FAA
ADF Automatic Direction Finder FAA
ADGE Air Defense Ground Environment FAA
ADI Attitude Direction Indicator FAA
ADIZ Air Defense Indication Zone FAA
ADL Aeronautical Data-Link FAA
ADLP Aircraft Data Link Processor FAA
ADLS Aeronautical Data Link System FAA
ADLVT Aeronautical Data Link Validation Team FAA
ADM Administration Identifier/Acquisition Decision Memorandum FAA
ADNS ARINC Data Network Service FAA
ADR 1.Accumulated Delta Ranging/Architectural Design Review FAA
ADR 2.Alternative Dispute Resolution FAA
ADS Automatic Dependent Surveillance FAA
ADS-B Automatic Dependant Surveillance-Broadcast FAA
Advisory An annunciation that is generated when crew awareness is required and subsequent crew action may be required; the associated color is unique but not red or amber/yellow. (Source: Advisory Circular AC25-11). FAA
AE Antenna Electronics FAA
AEA Aircraft Electronics Association FAA
AEEC Airlines Electronic Engineering Committee FAA
AEFT Active Element Fault Tree FAA
AEI Auroral-E Ionization FAA
AERA Automated En Route Air Traffic Control FAA
AES Aeronautical Earth Station/Aircraft Earth Station FAA
AF Airway Facilities FAA
AFB Air Force Base FAA
AFC Automatic Frequency Compensation FAA
AFCC Air Force Communications Command FAA
AFCS Automatic Flight Control Systems FAA
AFEPS ACARS Front End Processing Systems FAA
AFI Authority and Format Identifier FAA
AFII Advanced Flight Inspection Initiative FAA
AFOTEC Air Force Operational Test & Evaluation Center FAA
AFS Flight Standards Service FAA
AFSC Air Force Systems Command FAA
AFSPACECOM Air Force Space Command FAA
AFSS Automated Flight Service Station FAA
AFTN Aeronautical Fixed Telecommunications Network FAA
AGATE Advanced General Aviation Transport Experiments FAA
AGC Automatic Gain Control FAA
AGL Above Ground Level FAA
AGL Great Lakes Region FAA
AGS Air/Ground System FAA
AHRS Attitude Heading Reference System FAA
AHS American Helicopter Society FAA
AII Accuracy Improvement Initiative FAA
AIP Airport Improvement Program FAA
AIP Aviation Information Publications FAA
AIR Aircraft Certification Service FAA
AIX Advanced Interactive Executive FAA
AJ Anti-Jamming FAA
Along The distance along the desired track from the waypoint to the perpendicular line from the desired track to the aircraft. FAA
ALE Automatic Link Establish FAA
ALG Logistics Service FAA
ALP Airport Layout Plan FAA
ALSIP Approach Lighting System Improvement Program FAA
ALSOH Automated L-band State of Health FAA
ALSF Approach Lighting System with Sequenced Flashing Lights FAA
AMASS Airport Movement Area Safety System FAA
AM/PM Amplitude Modulation-to-Phase Modulation FAA
AMC Aeronautical Mobil Communications/Aeronautical Center FAA
AMCP Aeronautical Mobil Communications Panel FAA
AMS Acquisition Management System FAA
AMSS Aeronautical Mobil Satellite Service FAA
AMSS Airborne Mobile Services System FAA
ANA Area Navigation Approach FAA
ANC Air Navigation Commission of <a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> FAA
ANCP Alternate Network Control Point FAA
ANCT Aircraft Network Control Terminal FAA
AND Associate Administrator for NAS Development FAA
ANE New England Regional Headquarters FAA
ANH Access Node Hub FAA
ANICS Alaskan National Airspace System Interfacility Communication Systems FAA
ANM Northwest Mountain Regional Headquarters FAA
ANN Program Director for Navigation and Landing FAA
ANP Actual Navigation Performance FAA
ANSEP Air Navigation Services Economic Panel FAA
ANSI American National Standards Institute FAA
AOAS Advanced Oceanic Automation System FAA
AOC Airport Obstruction Chart FAA
AOC Aircraft Operational Control/Aeronautical Operational Control FAA
AOL Airborne Optical Laser FAA
AOP Aeronautical OSI Profile FAA
AOPA Aircraft Owners and Pilots Association FAA
AOR Atlantic Ocean Region FAA
AOR-E Atlantic Ocean Region East FAA
AOR-W Atlantic Ocean Region West FAA
AOS Operational Support Services FAA
AP Acquisition Plan FAA
APB Acquisition Program Baseline FAA
APC Adaptive Predicative Coding/Aeronautical Passenger Comm. FAA
APC Acquisition Processing Cabinets FAA
API Application Program Interface FAA
APL Airport Pseudolites FAA
APM Associate Program Manager FAA
APME Associate Program Manager for Engineering FAA
APML Associate Program Manager for Logistics FAA
APMNI Associate Program Manager for NAS Implementation FAA
APMSE Associate Program Manager for Systems Engineering FAA
APMT Associate Program Manager for Test FAA
APP Annual Procurement Plan FAA
APPS Aeronautical Radio Facilities and Parts Provisioning System FAA
Applications Specific use of systems that address particular user requirements. For the case of GNSS, applications are defined in terms of specific operational scenarios. FAA
APR Automatic Position Reporting/Agency Procurement Request FAA
APS Acquisition Phase Summary FAA
APV Approach Procedure with Vertical guidance FAA
AQPSK Aviation Quadrature Phase Shift Keying FAA
ARA 1.Airborne Radar Approach FAA
ARA 2.Administrator for Research & Acquisitions FAA
ARAC Aviation Regulatory Advisory Committe FAA
ARAMT ARA Management Team FAA
ARC Acquisition Review Committee FAA
ARCS Automatic Route Control System FAA
ARD Research and Development Service FAA
Area Navigation (RNAV) Application of the navigation process providing the capability to establish and maintain a flight path on any arbitrary chosen course that remains within the coverage area of navigation sources being used. RNAV utilizing capabilities in the horizontal pl FAA
ARIG Acquisition Reform Interim Guidance FAA
ARINC Aeronautical Radio, Inc. FAA
ARM Autonomous Ranging Mode FAA
ARMS Automated Risk Management System FAA
ARQ Automatic Repeat Request FAA
ARS Area Selector FAA
ARSR Air Route Surveillance Radar FAA
ARTCC Air Route Traffic Control Center FAA
ARTS Automatic Radar Terminal System FAA
ASAG Acquisition System Advisory Group FAA
ASAS Aviation Safety Analysis System FAA
ASCII American Standard Code for Information Interchange FAA
ASIC Application Specific Integrated Circuit FAA
ASCQC Aeronautical Satellite Communications Qualifications Center FAA
ASD Associate Administrator for Systems Engineering and Development FAA
ASDE Airport Surface Detection Equipment FAA
ASE Airborne System Error/NAS System Engineering Service FAA
ASF Additional Secondary Factor (related to Loran-C; ASF means the difference in propagation time between the transmitter and receiver for the actual path as compared to an all seawater FAA
ASIC Application Specific Integrated Circuit FAA
ASN or ASN2 Access Stack Node 2 FAA
ASO Southern Regional Headquarters FAA
ASOPT Advanced System Operational Planning Team FAA
ASORRF Start of a Aircraft Receive Reporting Frame FAA
ASORTCF Start of a Aircraft Receive Terminal Control Frame FAA
ASOS Automated Surface Observing FAA
ASR Airport Surveillance Radar FAA
ASP 1.Acquisition Strategy Paper FAA
ASP 2.Aviation Sequencing Program FAA
ASPM Aviation System Performance Metric FAA
ASTA Airport Surface Traffic Automation FAA
ASW Southwest Regional Headquarters FAA
AT Air Traffic FAA
ATA Air Transport Association FAA
ATC Air Traffic Control FAA
ATCBI Air Traffic Control Beacon Interrogator FAA
ATCRBS Air Traffic Control Radar Beacon System FAA
ATCSCC Air Traffic Control System Command Center FAA
ATCT Airport Traffic Control Tower FAA
ATIDS Airport Surface Target Identification System FAA
ATE Automatic Test Equipment FAA
ATIS Automatic Terminal Information Service FAA
ATM Air Traffic Management FAA
ATN Aeronautical Telecommunications Network FAA
ATOMS Air Traffic Operational Management System FAA
ATR Air Traffic Plans and Requirements Service FAA
ATS Air Traffic Service FAA
ATSC Air Traffic Services Communications FAA
ATSMP Air Traffic Services Message Processor FAA
ATSOIT Air Traffic Satellite Operational Implementation Team FAA
ATSS Air Traffic Services System FAA
AUI Attachment Unit Interface FAA
AUTOVON Automatic Voice Network FAA
Availability The availability of a navigation system is the ability of the system to provide the required function and performance at the initiation of the intended operation. Availability is an indication of the ability of the system to provide usable service within FAA
AVCS Attitude and Velocity Control Subsystems FAA
AVLN Automatic Vehicle Location and Navigation FAA
AVN Aviation System Standard FAA
AVR Associate Administrator for Regulation & Certification FAA
AVPAC Aviation VHF Packet Communications FAA
AWIPS Advanced Weather Interactive Processing System FAA
AWOP All Weather Operations Panel FAA
AWP Western Pacific Regional Headquarters FAA
Barometric Altitude Geopotential altitude in the earth FAA
B1 Hardware Requirement Specification FAA
BA Bachelor of Arts FAA
BBN Basic Backup Network FAA
BCD Binary Coded Decimal FAA
BCN Backbone Concentrator Node FAA
BCS Buoy Communications System FAA
BCWP Budgeted Cost of Work Performed FAA
BCWS Budgeted Cost of Work Scheduled FAA
BE Binary Editor FAA
BER Bit Error Rate FAA
BCWS Budgeted Cost for Work Schedule FAA
BGR-AFSS Bangor, ME Automated Flight Service Station FAA
BI Burst Interval FAA
BIL Billings, MT TRACON FAA
BILL Billing System FAA
BIPM International Bureau of Weights & Measures FAA
BIT Built-in Test FAA
BITE Built-in Test Equipment/Backward Inter-working Telephone Event FAA
BL Burst Length FAA
BMN Baseline Management Notice FAA
BMV Broadcast Message Validation FAA
BNR Binary Numbers FAA
BOM Bill Of Material FAA
BONeS Block Oriented Network Simulator FAA
BOP Bit-Oriented Protocol FAA
BOS Beginning Of Slot FAA
BPF Band Pass Filter FAA
Bps Bits Per Second FAA
BPSK Binary Phase Shift Keying FAA
BS Bachelor of Science FAA
BSEE Bachelor of Science, Electrical Engineering FAA
BT British Telecom FAA
BTP Baseline Transfer Plan FAA
BTP Burst Time Plan FAA
BU Block Update FAA
BUEC Backup Emergency Communication FAA
BUFR Binary Universal Form for Data Representation FAA
BW Bandwidth FAA
C Celsius FAA
C-1 Correction Processor 1 FAA
C-2 Correction Processor 2 FAA
C&V Correction and Verification FAA
C-TO-l C-band to L-band FAA
C/A Coarse/Acquisition FAA
C/A-CODE Coarse Acquisition Code FAA
C/NO Carrier-to-Noise-Density Ratio FAA
C/SCSC Cost/Schedule Control System Criteria FAA
C/SSR Cost/Schedule Status Reporting FAA
CAA 1. Cargo Airlines Association FAA
CAA 2. Civil Aviation Authority FAA
C3I Command, Control, Communications, and Intelligence FAA
CA California FAA
CAATS Canadian Automated Air Traffic System FAA
CAGE Commercial and Government Entity FAA
CAI Contractor Acceptance Inspection FAA
CAM Cost Account Manager FAA
CAP Cost Account Plan FAA
CAS 1. Collision Avoidance System FAA
CAS 2. Commercially Available Software FAA
CAS 3. Cost Accounting Standards FAA
CASB Cost Account Standards Board FAA
CASE Computer Aided Software Engineering FAA
CAT Category FAA
CAT-I Category I FAA
Caution An annunciation that is generated when immediate crew awareness is required and subsequent crew action will be required; the associated color is amber/yellow. (Source: Advisory Circular AC25-11) FAA
CB Clock Bias FAA
CBB Contractor Budget Base FAA
CBM Clock Bias Mean FAA
CBA Cost Benefit Analysis FAA
CBD Commerce Business Daily FAA
CBI Computer-Based Instruction FAA
CC Connection Confirmation FAA
CC Clock Correction FAA
CCB 1. Communication Control Block FAA
CCB 2. Configuration Control Board FAA
CCB 3. Change Control Board FAA
CCC Communications Control Circuit FAA
CCD Configuration Control Decision FAA
CCIR International Radio Consultative Committee FAA
CCITT International Telegraph and Telephone Consultative Committee FAA
CCR Constant Current Regulator FAA
CCS Command and Control Systems FAA
CCU Computer Control Unit FAA
CCZ Coastal Confluence Zone FAA
CD Compact Disk FAA
CDB Cold Bay FSS FAA
CDG Course Design Guide FAA
CD-ROM Compact Disk-Read Only Memory FAA
CDI Course Deviation Indicator FAA
CDLS Contract Data Requirement List FAA
CDM Collaborative Decision-Making FAA
CDMA Code-Division Multiple Access FAA
CDR Critical Design Review FAA
CDRL Contract Data Requirement FAA
CDU Control Display Unit FAA
CE Concept Exploration FAA
CEA Central Engineering Activity FAA
CEP Circular Error Probable FAA
CF Course-to-Fix FAA
CERAP Combined Enroute Radar Approach Control Facility FAA
CERB Cost Estimate Review Board FAA
CFB Contract Funding Brief FAA
CFE Communications Facilities Enhancement FAA
CFE Contractor-Furnished Equipment FAA
CFIT Controlled Flight into Terrain FAA
CFNO Current Frame Number FAA
CFSR Contract Funds Status Report FAA
CGIC Civil GPS Information Center FAA
CHI Computer Human Interface FAA
CHIWG Computer Human Interface Working Group FAA
CI Configuration Item FAA
CID Commercial Item Drawing FAA
CIDS Critical Item Development Specification FAA
CIO Conventional International Origin FAA
CIP Capital Improvement Plan FAA
cm Centimeters FAA
cm/sec Centimeters/Second FAA
CIGNET Cooperative International GPS Network FAA
CIP Capital Investment Plan FAA
CIPP Critical Infrastructure Protection Plan FAA
CIS Conventional Inertial System/Commonwealth of Independent States FAA
CIT California Institute of Technology FAA
CLIN Contract Line Item Number FAA
CLK Clock FAA
cm Centimeters FAA
CM 1. Configuration Management FAA
CM 2. Center of Mass FAA
CM 3. Corrective Maintenance FAA
CMA Configuration Management Administration FAA
CMC Canadian Marconi Corporation FAA
CMCC Consolidated Maintenance Control Center FAA
CMD Control C&V Mode FAA
CMDR Satellite Operations Crew Commander FAA
CMLS Contractor Maintenance Logistics Support FAA
CMM Capability Maturity Model FAA
CMN Control Motion Noise FAA
CMP Configuration Management Plan FAA
CMTBF Mean Time Between Mission Critical Failures FAA
CMTP Contractor Master Test Plan FAA
CMU Communications Management Unit/Computer Management Unit FAA
CNI Communications, Navigation, and Intelligence FAA
CNMP Capability Maturity Model FAA
CNS/ATM Communications, Navigation, and Surveillance/Air Traffic Management FAA
CNS Communications, Navigation, and Surveillance FAA
CNSI Common Network Security Interface FAA
CO Contracting Officer FAA
COB Close Of Business FAA
COCO Chief of the Contracting Office FAA
CODEC Coder-Decoder FAA
COF Continuity of Function FAA
COI Critical Operational Issue FAA
COM 1. Control C&V Operations and Maintenance FAA
COM 2. Cost of Money FAA
Comm Communications FAA
COMSAT Communications Satellite Corporation FAA
COMSEC Communications Security FAA
CONOPS Concept of Operations FAA
CONS Connector-Oriented Network Service FAA
CONUS Continental US; Conterminous/Contiguous US FAA
CONV Conversion FAA
COP Character-Oriented Protocol FAA
COR Correction Host Processor FAA
COTR Contracting Officers Technical Representative FAA
COTS Commercial Off-the-Shelf FAA
CP Reference Number for a Telephone Call FAA
CP Corrections Processor FAA
CPC Computer Program Component FAA
CPCI Computer Program Configuration Item FAA
CPDLC Controller-Pilot Data Link Communication FAA
CPF Central Processing Facility FAA
CPFS Computer Program Functional Specification FAA
CPI Consumer Price Index FAA
CPM Carrier FAA
CPR Cost Performance Report FAA
CPU Central Processing Unit FAA
CR Connection Request FAA
CRC Cyclic Redundancy Check FAA
CRDA Cooperative Research and Development Agreement FAA
CRF Connection Refused FAA
CRL Communication Research Laboratory FAA
CRISD Computer Resources Integrated Support Document FAA
CRM Collision Risk Model FAA
CRPA Controlled Radiation Patterned Antenna FAA
CRR Common Reference Receiver FAA
CRS Contractor Repair Service FAA
CRT Cathode Ray Tubes FAA
CS 1. Civil Signal FAA
CS 2. Control Segment FAA
CSAR Configuration Status Accounting Report FAA
CSC Computer Software Component FAA
CSCI Computer Software Configuration Item FAA
CSE Common Support Equipment FAA
CSEP Common Systems Engineering Process FAA
CSMA/CD Carrier Sense Multiple Access with Collision Detection FAA
CSOC Consolidated Space Operations Center (Falcon AFS) FAA
CSPR Report Cost/Schedule Performance FAA
CSQPP Computer Software Quality Program Plan FAA
CSTP Contractor Support Transition Plan FAA
CSU Computer Software Unit/Channel Service Units FAA
CSWP Common Software Process FAA
CT Connecticut FAA
CTCOR Clock and Time Coordinator FAA
CTEMP Contractor Test and Evaluation Master Plan FAA
CUE Common User Element FAA
CV Correction and Verification FAA
CW Continuous Wave FAA
CWBS Contract Work Breakdown Structure FAA
CY Calendar Year FAA
D Delivery Confirmation Bit FAA
DA Decision Altitude FAA
DAA Designated Approving Authority FAA
DA (H) Decision Altitude (Height) FAA
DAL Development Assurance Level FAA
DAS Data Approval Sheet FAA
DAU Determine Alarm or Update FAA
DAY Dayton AFSS FAA
DLAP Data Link Application Processor FAA
dB Decibels FAA
db/*K Decibels per degree Kelvin FAA
dBHz Decibel Hertz FAA
dBi Decibel relative to isotropically radiated power FAA
Dbic Decibels above Isotropic FAA
DBil (Decibels FAA
DBL Development Baseline FAA
dBW Decibel relative to 1 Watt FAA
DBW/M2 Decibel relative to 1 Watt per square meter FAA
D.C. District of Columbia FAA
DC Direct Current FAA
DCAA Defense Contract Audit Agency FAA
DCACAS Data Collection, Analysis, and Corrective Action System, FAA
DCE Data Communication Equipment FAA
DCH Datum Crossing Height FAA
DCMDR Deputy Satellite Operations Crew Commander FAA
DCN Design Change Notice FAA
DCP Data Collection Processing CSCI; Data Collection Processor FAA
DCT Dynamic Configuration Tool FAA
DD 1. Data Dictionary FAA
DD 2. Detailed Design FAA
DDC Direct Digital Connect FAA
DDE Data Dictionary Entry FAA
DDR Derived Design Requirements FAA
DDS Direct Digital Synthesizer FAA
DDT Design Data Transmittal FAA
DEC Data Circuit-Terminating Equipment FAA
DED Data Editing FAA
DEDS Data Entry and Display Subsystem FAA
deg Degree FAA
DEMARC Demarcation FAA
DEMVAL Demonstration and Validation FAA
DER Designated Engineering Representative FAA
DF Direction Funding FAA
DFD Data Flow Diagram FAA
DFR Detailed Financial Review FAA
DGNSS Differential Global Satellite Navigation System FAA
DGPS Differential Global Positioning System FAA
DH Decision Height FAA
DHCP Dynamic Host Configuration Protocol FAA
DI Data Integration and Calculation FAA
DID Data Item Description FAA
DL Data Link FAA
DLL Delay Lock Loop FAA
DLO Data Link Only FAA
DLP Data Link Processor FAA
DLS Data Link Service FAA
DLSC Defense Logistics Services Center FAA
DLT Digital Linear Tape FAA
DM Data Management FAA
DMA Defense Mapping Agency FAA
DME Distance Measuring Equipment FAA
DMN Data Multiplexing Network FAA
Dn Time Control Correction FAA
DNS Domain Name System FAA
DoC Department of Commerce FAA
DoD Department of Defense FAA
DoDISS Department of Defense Index of Specifications and Standards FAA
DOM Derivatives of Observables with Respect to Parameters FAA
DOORS Dynamic Object Oriented Requirements System FAA
DOP Dilution Of Precision FAA
DOT Department of Transportation FAA
DOTS Dynamic Ocean Tacking System FAA
DP Datum Point FAA
DPA Delegation of Procurement Authority FAA
DPP SCP Data Preprocessor FAA
dpi Dots per inch FAA
DPR Differential Pseudorange FAA
DPRC Differential Pseudorange Correction FAA
DPS Digital Power Supply FAA
DPSSF Data Processing and Software Simulation Facility FAA
DQT Design Qualification Test FAA
DR Delta Range/Dead Reckoning FAA
D.R. Dead Reckoning FAA
DRAM Direct Random Access Memory FAA
DRE Differential Range Error FAA
DRM Design Room Manual FAA
DRMAP Data Responsibility Matrix/Acceptance Plan FAA
DRMS Distance Root Mean Square (not to be confused with Sigma) FAA
DRO Dispute Resolution Officer FAA
DRS Data Reduction Software FAA
DRT Diagnostic Rhyme Test FAA
DS Define Test Scenario FAA
DSLOC Delivered Software Lines Of Code FAA
DSP Digital Signal Processing FAA
DSO Digital signal, level zero FAA
DSR Data Set Ready FAA
DSR Display System Replacement FAA
DSSS Decision Support System Services FAA
DSU Data Service Unit FAA
DT&E Development Test and Evaluation FAA
DTC Design-to-Cost/Dry Term Correction FAA
DTE Data Terminal Equipment FAA
DTE Data Termination Equipment FAA
DTR Data Terminal Ready FAA
DV Data Validation FAA
DVMRP Distance Vector Multicast Routing Protocol FAA
DVRS Digital Voice Recorder System FAA
E&R Exchange and Repair FAA
E-IGRP Enhanced Interior Gateway Routing Protocol FAA
EA Environmental Assessment FAA
EAC Estimate at Completion FAA
EAROM Electrically Alterable Read Only Memory FAA
EC Ephemeris CORRECTION FAA
EC Executive Counsel FAA
ECC Error Checking and Correction FAA
ECD Envelope-to-Cycle Discrepancy FAA
ECEF Earth Centered Earth Fixed FAA
ECEST Ephermis and Clock Estimator FAA
ECI Earth-centered Inertial FAA
ECM Engineering Change Memorandum FAA
ECP Engineering Change Proposal FAA
ECR Engineering Change Request FAA
ECU European Currency Unit FAA
EDC Engineering Document Control FAA
EDM 1. Electronic Distance Measurement FAA
EDM 2. Engineering Development Model FAA
EDO Extended Data Output FAA
EDS Explosives Detection System FAA
EEM Electronic Equipment Modification FAA
EFAS Extended Final Approach Segment FAA
EFIS Electronic Flight Instrument System FAA
EGM Earth FAA
EGNOS European Geostationary Navigation Overlay Service FAA
EHF Extremely High Frequency FAA
EIA Electronic Industries Association FAA
EICAS Engine Indicating and Crew Alerting System FAA
EIRP Effective Isotropic Radiated Power FAA
EIRP Effective Isotropic Radiated Power FAA
EIS Environment Impact Statement FAA
El Glidepath Angel (approach path elevation angle) FAA
ELT Emergency Locating Transmitter FAA
EMC Electro-Magnetic Compatibility FAA
EMC Electro-Magnetic Capacity FAA
EMI Electro-Magnetic Interference FAA
EMP Electro-Magnetic Pulse FAA
EMR Electromagnetic Radiation FAA
ENB Engineering Notebook FAA
EO Engineering Order FAA
EOL End Of Life FAA
EOP Earth Orientation Parameters FAA
EOS End Of Slot FAA
EOS Electro-Optical Segment FAA
EPROM Erasable Programmable Read Only Memory FAA
EPS Electrical Power (Sub) system FAA
EQS Equipment Selector FAA
Eq Equation FAA
ER En Route FAA
ER-NPA En Route through Nonprecision Approach FAA
ERD Estimated Range Deviation FAA
ERL Environmental Research Laboratories FAA
ERP Effective Radiated Power FAA
ERRMP Error Multipath FAA
ERS Early Resolution System FAA
ES Earth Station/End-System FAA
ESC Electronics Systems Center FAA
ESD Electrostatic Sensitive Discharge FAA
ESD Electrostatic Discharge FAA
ESL Economic Service Life FAA
ESLOC Equivalent Software Lines Of Code FAA
ESP Encapsulating Security Payloads FAA
ETA Estimated Time of Arrival FAA
ETD Explosives Trace Detection FAA
ETMS Enhance Traffic Management System FAA
ETVS Enhanced Terminal Voice Switch FAA
EUL End User Location FAA
EVM Earned Value Management FAA
EVS Enhanced Vision System FAA
EWAAS End-State Wide Area Augmentaition System FAA
EXCOM Executive Committee FAA
F&E Facilities and Equipment FAA
F-SAT Final Site Acceptance Test FAA
<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> Federal Aviation Administration FAA
<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>LC Federal Aviation Administration Logistics Center FAA
<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>Q Federal Aviation Administration Headquarters FAA
<a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a>TC Federal Aviation Administration Technical Center FAA
FAB Federal Executive Advisory Board FAA
FACES Flight Management System Aeronautical Telecommunications Network Calibration through Enhanced Surveillance FAA
FAE <a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> Acquisition Executive FAA
FAF Final Approach Fix FAA
FANS Future Air Navigation System FAA
FAR Federal Acquisition/Aviation Regulations FAA
FAS Final Approach Segment FAA
FAST <a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> Acquisition System Toolset FAA
FASTF <a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> Satellite Test Facility FAA
FAT Factory Acceptance Test FAA
FATP Factory Acceptance Test Plan FAA
FAWP Final Approach Waypoint FAA
FBL Functional Baseline FAA
FCA Functional Configuration Audit FAA
FCC Federal Communications Commission FAA
FCP Fast Correction Processing FAA
FCS Frame check sequence FAA
FQC Frequency Corrections FAA
FCS Flight Control System FAA
FC Fault Detection FAA
FD Format Simulated Data FAA
FDA Frequency Distribution Amplifier FAA
FDAD Full Digits ARTS Display FAA
FDE Fault Detection and Exclusion FAA
FDIO Flight Data Input and Output FAA
FDMA Frequency Division Multiple Access FAA
FDX Full Duplex FAA
FEC Forward Error Correction FAA
FED Federal FAA
FES Fast Ethernet Switch FAA
FFRDC Federally Funded Research and Development Center FAA
FH Frame-level header FAA
FI Fault Isolation FAA
FID Format Identifier Field FAA
FIP Federal Information Processing FAA
FIR Flight Information Region FAA
FIRMR Federal Information Resource Management Regulation FAA
FIS Flight Information Service FAA
FL Flight Level FAA
FMC Flight Management Computer FAA
FMEA Failure Modes and Effects Analysis FAA
FMECA Failure Mode, Effects, and Criticality Analysis FAA
FMI Flexible Modular Interface FAA
FM Frequency Modulation FAA
FMS Flight Management System FAA
FMT Format Message FAA
FOB Freight On Board FAA
FOC Full Operational Capacity/Capability FAA
FOM Figure of Merit FAA
FONSI Finding of No Significant Impact FAA
FOUO For Official Use Only FAA
FP Frequency Plan FAA
FPAP Flight Path Alignment Point FAA
FPGA Field Programmable Gate Arrays FAA
FPS Fixed Position Surveillance FAA
FQR Formal Qualification Review FAA
FQT Formal Qualification Testing FAA
FQT Formal Qualification Test FAA
FRACAS Failure Reporting and Corrective Action System FAA
FRACAS Failure Reporting, Analysis, and Corrective Action System FAA
FRB Failure Review Board FAA
FRDF Facility Reference Data File FAA
FRE Fast Routing Engine FAA
FRP Federal Radionavigation Plan FAA
FRPA Fixed Radiation Patterned Antenna FAA
FSAS Flight Service Automation System FAA
FSD Full-Scale Development FAA
FSD Full Scale Deflection FAA
FSEP Facility, Service, and Equipment Profile FAA
FSL Forecast Systems Laboratory FAA
FSM Firmware Support Manual FAA
FSN Frame Sequence Number FAA
FSS Federal Supply Schedule FAA
FT&E Feasibility Test Plan FAA
FTA Fault Tree Analysis FAA
FTE Flight Technical Error FAA
FTI <a href="https://www.faa.gov/jobs/abbreviations/" target="_blank">FAA</a> Telecommunications Infrastructure FAA
FTP File Transfer Protocol FAA
FTS Federal Telecommunications Service FAA
FTS2000 File Transfer Service 2000 FAA
FVS Functional Verification System FAA
FX Frequency Excision FAA
FXNONAP FX and Nonlinear Adaptive Processing FAA
FY Fiscal Year FAA
g Acceleration of Gravity FAA
g Gram FAA
G Gain FAA
G/T Gain/Temperature FAA
GA General Aviation/Ground Antenna FAA
GA&VF General Aviation and Vertical Flight FAA
GAO General Accounting Office FAA
GARB GPS Alignment Reference Point FAA
GB Gigabyte FAA
GBAS Ground Based Augmentation System FAA
GBI Ground-Based Inerting FAA
GCCS Geostationary Communication and Control Segment FAA
GCS 1. Geostationary Communication Segment FAA
GCS 2. GEO Communications Subsystem FAA
GDLP Ground Data Link Processor FAA
GDM General Development Model FAA
GDM Ground Model FAA
GDOP Geometric Dilution of Precision (in x,y,z,t for GPS) FAA
GEG GPS Ephemeris Geometry Processing FAA
GEO Geostationary Earth Orbit FAA
GEOS Geostationary Earth Orbit Satellite FAA
GEP GEO Ephemeris Processing FAA
GES Ground-Earth Station FAA
GFE Government-Furnished Equipment FAA
GFI Government Furnished Information FAA
GFP Government Furnished Property FAA
GFS Government Furnished Service FAA
GG GPS/GEO Data Collector FAA
GHZ Gigahertz (1 billion Hz) FAA
GIB Ground Integrity Broadcast FAA
GIB/WAD Ground Integrity Broadcast/Wide-Area Differential FAA
GIC Global Positioning System Integrity Channel FAA
GICE Government Independent Cost Estimate FAA
GIP Government Industry Partnership FAA
GIPSY GPS Inferred Positioning System FAA
GIS Geographic Information System FAA
GIST Global navigation satellite system In-Service Test FAA
GIVE Grid Ionospheric Vertical Error FAA
GIVEI Grid Ionospheric Vertical Error Indicator FAA
GIWG GPS International Working Group FAA
GL Ground Level FAA
GL GUS LRU Simulator FAA
GLONASS Global Orbiting Navigation Satellite System FAA
GLONASS Global Navigation Satellite System (Russia) FAA
GLS GNSS Landing System FAA
GMC Ground Monitoring and Control FAA
GME Gross Navigation Error FAA
GMS Ground Monitoring Equipment FAA
GMS Ground Monitoring Station FAA
GMT Greenwich Mean Time FAA
GNE Gross Navigational Error FAA
GNG GEO Navigation Data Generation FAA
GNSS Global Navigation Satellite System (<a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a>) FAA
GNSSU GNSS (Landing) Unit FAA
GOES Geostationary Operational Environmental Satellite FAA
GoM Gulf of Mexico FAA
GOS Geocenter Offset and Coordinate Scaling FAA
GOSPAR GPS OCS Performance Analysis and Reporting FAA
GP 2. GUS Processing FAA
GP 2. GCS Processor FAA
GPA Glide Path Angle FAA
GPI Ground Point of Intercept FAA
GPIP Glide Path Intercept Point FAA
GPIRU Global Positioning Inertial Reference System FAA
GPS Global Positioning System FAA
GPSIC GPS Information Center FAA
GPST Global Positioning System Time FAA
GR Ground Reference FAA
GRI Ground Repetition Rate FAA
GRIB Gridded Binary FAA
GRP Host-Group Identifier FAA
GRR Group Repetition Rate FAA
GRS Geodetic Reference System FAA
GS GP Simulator FAA
GSA General Services Administration FAA
GSO Satellite Ground System Operator FAA
GST GEO Satellite Transponder FAA
GTS Global Timing System FAA
GUI Graphical User Interface FAA
GUS GEO Uplink Sub System FAA
GUS Ground Uplink Station FAA
GUS_H GEO Uplink Subsystem HWCI FAA
GUSP GUS Processor FAA
H/W Hardware FAA
HAL Horizontal Alert Limit FAA
HAT Height Above Touchdown FAA
HCI Human Computer Interface FAA
HD High Dynamic FAA
HDLC High-level Data Link Control FAA
HDOP Horizontal Dilution of Precision (in x,y) FAA
HDOP Horizontal Dilution Of Precision FAA
HDOP Horizontal Dilution of Position FAA
HDTV High Definition Television FAA
HDUE High Dynamic User Equipment FAA
HE Human Engineering FAA
HEDAD-M Human Engineering Design Approach Document-Maintainer FAA
HF 1. High Frequency FAA
HF 2. Human Factors FAA
HFE Human Factors Engineering FAA
HFP Human Factors Plan FAA
HGAS High Gain Avionics System FAA
HID Host Interface Device FAA
HIRF High Intensity Radiation Fields FAA
HILS Helicopter Instrument Lighting System FAA
HITS Hughes Information Technology Systems FAA
HLE Higher Layer Entity FAA
HMI Hazardously Misleading Information FAA
HNL Honolulu, HI AFSS FAA
HOCM House Of Cards Model FAA
HOCSR Host/Oceanic Computer System Replacement FAA
HOL High Order Language (computer language) FAA
HOT Hands-On Training FAA
HOW Handover Word FAA
HP Hewlett Packard FAA
HPA High Power Amplifier FAA
HPE Horizontal Position Error FAA
HPET Horizontal Position Error Threshold FAA
HPE Horizontal Position Error FAA
HPL Horizontal Protection Level FAA
HPR Hardware Problem Reports FAA
HQ Headquarters FAA
HRI Hazard Risk Index FAA
HRs Hazard Records FAA
Hrs Hours FAA
HRT Hazard Review Team FAA
I Horizontal Situation Indicator FAA
HST Host Identifier FAA
HTSC Hughes Technical Services Company FAA
HTZ Helicopter Touchdown Zone FAA
HUD Heads Up Display FAA
HUL Horizontal Uncertainty Level FAA
HVAC Heating, Ventilation, and Air Conditioning FAA
HW Hardware FAA
HWCI Hardware Configuration Item FAA
Hz Hertz FAA
I-3 INMARSAT-3 FAA
ICMM Integrated Capability Maturity Model FAA
I/F Intermediate Frequency FAA
I/O Input/Output FAA
I/S Interference-to-Signal ratio FAA
IA Investment Analysis FAA
IACSP International Aeronautics Communications Service Provider FAA
IADS Iceland Air Defense System FAA
IAF Initial Approach Fix FAA
IAG International Association of Geodesy FAA
IAP Initial Approach Point/Instrument Approach Procedures FAA
IAPA Instrument Approach Procedures Automation FAA
IAR Investment Analysis Report FAA
IATA International Air Transport Association FAA
IAU International Astronomical Union FAA
IAW In Accordance With FAA
IAWP Initial Approach Waypoint FAA
IBLS Integrated Beacon Landing System FAA
IBM International Business Machines FAA
IBP Integration Build Plan FAA
<a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> 1. International Civil Aviation Organization FAA
<a href="https://www.icao.int/Pages/default.aspx" target="_blank">ICAO</a> 2. Intercard FAA
IC Ionospheric Correction FAA
ICC 1. Ionospheric Correction Computation FAA
ICC 2. Iono Corrections Capability FAA
ICD 1. Interface Control Document/International Code Designator FAA
ICD 2. Interface Control Document FAA
ICDLS Interim Contractor Depot and Logistics Support FAA
ICMLS Integrated Contractor Maintenance and Logistics Support FAA
iCMM Integrated Capability Maturity Model FAA
ICMLS Interim Contractor Maintenance and Logistics Support FAA
ICMP Internet Control Management Protocol FAA
ICO 1. Intermediate Circular Orbit FAA
ICO 2. Initial Operating Capability FAA
ICS Interim Contractor Support FAA
ICWG Interface Control Working Group FAA
ID 1. Identification FAA
ID 2. Identifier FAA
IDC Interface Control Document FAA
IDD Interface Design Document FAA
IDI Initial Domain Identifier FAA
IDM Integrity Data Monitoring FAA
IDM Independent Data Monitor FAA
IDR Internal Design Review FAA
IDV Independent Data Verification FAA
IDV Independent Design Verification FAA
IEC International Electro technical Commission FAA
IEEE 1. International Electrical and Electronic Engineers FAA
IEEE 2. Institute of Electrical Engineers FAA
IERS International Earth Rotation Service FAA
IETF Internet Engineering Task Force FAA
IETM Interim Electronic Technical Manuel FAA
IF 1. Intermediate Frequency FAA
IF 2. Interface FAA
IFM Interface Management FAA
IFR Instrument Flight Rules FAA
IGEB Interagency GPS Executive Board FAA
IGES Initial Ground Earth Station FAA
IGMP Internet Group Management Protocol FAA
IGP Ionospheric Grid Point FAA
ILM-TRACON Wilmington, NC TRACON FAA
ILS 1. Instrument Landing System FAA
ILS 2. Integrated Logistics Support FAA
ILSMT Integrated Logistics Support Management Team FAA
ILSP Integrated Logistics Support Plan FAA
IM Intermodulation FAA
IMAS Initial Missed Approach Segment FAA
IMC Instrument Meteorological Conditions FAA
IMCS Interim Monitor and Control Software FAA
IMT Integrated Management Team FAA
IMU Inertial Measurement Unit FAA
INMARSAT International Maritime Satellite Organization FAA
INS Inertial Navigation System FAA
INU Inertial Navigation Unit FAA
IOA Independent Operational Assessment FAA
IOC Initial Operational Capability FAA
IOD Issuance Of Data FAA
IODC Issurance Of Data Clock FAA
IODE Issurance Of Data Ephermis FAA
IODI Issurance Of Data Ionosphere FAA
IODP Issurance Of Data PRN mask FAA
IODS Service Issue of Date FAA
ION Institute of Navigation FAA
IONO Ionospheric Determination Processing Algorithm FAA
IOR Indian Ocean Region FAA
IOS Indian Ocean Station FAA
IOT Inter-Organizational Transfers FAA
IOT&E Independent/Integration Operational Test and Evaluation FAA
IP Internet Protocol FAA
IPACG Informal Pacific ATC Coordination Group FAA
IPB Illustrated Parts Breakdown FAA
IPC Interprocess Communication FAA
IPDS Integrated Product Development System FAA
IPLT Integrated Product Leadership Team FAA
IPP 1. Ionospheric Pierce Point FAA
IPP 2. Integrated Program Plan FAA
IPR In Process Review FAA
IPT Integrated Product Team FAA
IRD Interface Requirements Documents FAA
IRIS International Radio Interferometric Surveying FAA
IRMP Information Resources Management Plan FAA
IRP Information Resources Protection FAA
IRS 1. Inertial Reference System FAA
IRS 2. Interface Requirements Specification FAA
IRT Integrated Requirement Team FAA
IRU Inertial Reference Unit FAA
IS Intermediate-System FAA
IS-IS Intermediate System-Intermediate System Protocol FAA
ISAP Integrated Support and Acquisition Plan FAA
ISC Initial System Capability FAA
ISDN Integrated Services Data Network FAA
ISM In-Service Management FAA
ISO 1. International Organization for Standardization FAA
ISO 2. International Standards Organization FAA
ISP 1. Internet Service Provider FAA
ISP 2. Integrated Support Plan FAA
ISPACG Informal South Pacific ATC Coordination Group FAA
ISR In-Service Review FAA
ISS Information System Security FAA
ISSC Information System Security Cerifier FAA
ISSCA ISS Certification Agent FAA
ISSG Integrated Satellite Signal Generator FAA
ISSM Information System Security Manager FAA
ISSP Information System Security Plan FAA
ISSPP Integrated System Safety Program Plan FAA
ISSS Initial Sector Suite System FAA
ISU Initial Signal Unit FAA
IT Information Technology FAA
IT&E Integration Test and Evaluation FAA
ITU International Telecommunication Union FAA
ITWS Integrated Terminal Weather System FAA
IV&V Independent Verification and Validation FAA
IVD Ionospheric Vertical Delay FAA
IVE Ionospheric Vertical Error FAA
IWAAS Initial Wide Area Augmentation System FAA
iWAASs IV&V WAAS simulator FAA
IWP Intermediate Waypoint FAA
J/S Jamming-to-Signal Power Ratio FAA
JAI Joint Acceptance and Inspection FAA
JAT Joint Acceptance Testing FAA
JCAB Japan Civil Aviation Bureau FAA
JD Julian Date FAA
JFK John F. Kennedy Airport, NY FAA
JHU/APL Johns Hopkins University Applied Physics Laboratory FAA
JNU Juneau AFSS FAA
JOTFOC Justification for Other Than Full and Open Competition FAA
JPL Jet Propulsion Laboratory FAA
JPO GPS Joint Program Office (El Segundo, CA) FAA
JRC Joint Resource Council FAA
JSS Joint Surveillance System FAA
JST Japanese Standard Time FAA
JTIDS Joint Tactical Information Distribution System FAA
JV (ARINC/SITA) Joint Venture FAA
K Kelvin FAA
KA Radio Frequency Ka FAA
KB Kilobyte FAA
Kbps Kilobits per second FAA
KCP Kinematic Carrier Phase FAA
KCPT Kinematic Carrier Phase Tracking FAA
KDD Kokusai Denshin Denwa FAA
KDP Key Decision Point FAA
Kg Kilogram FAA
kHz Kilohertz FAA
km kilometer FAA
KPA Klyston Power Amplifier FAA
Kts Knots FAA
Ku Radio Frequency Ku FAA
KVA Kilovoltampere FAA
L-BAND Frequency from 390Mhz to approximately 1.55Ghz FAA
L1 Carrier FAA
L1 GPS Standard Positioning Service L-band ranging signal FAA
L2 Carrier FAA
L2 GPS Precision Positioning Service L-band ranging signal FAA
L3 Carrier FAA
LAAS Local Area Augmentation System FAA
LADGPS Local Area Differential GPS FAA
LAN Local Area Network FAA
LANE LAN Emulation FAA
LAPB Link Access Procedure Balanced FAA
LAX Los Angeles, CA Airport FAA
LBS L-band Subsystem FAA
LCC Life Cycle Cost/Leased Common Carrier FAA
LCCE Life Cycle Cost FAA
LCD Liquid Crystal Display FAA
LCN 1. Logical Channel Number FAA
LCN 2. LSA Control Number FAA
LCN 3. Local Communications Network FAA
LCP Long-Term Correction Processing FAA
LD Low Dynamic FAA
LDA Localizer Directional Aid FAA
LDGPS Local Differential GPS FAA
LDR Labor Distribution Reporting FAA
LDRCL Low Density Radio Communications Link FAA
LDS Large Size Display Subsystem FAA
LEAN Low-Elevation Antenna Nuller FAA
LED Light Emitting Diode FAA
LEO Low Earth Orbiting FAA
LEP Linear Error Probable FAA
LF Low Frequency FAA
LFRD Logistics Funding Requirements Document FAA
LGA LaGuardia, NY Airport FAA
LGAS Low Ground Avionics System FAA
LGPV Lateral Guidance with Precision Vertical FAA
LHC Left Hand Circular FAA
LIB Local-area Integrity Broadcast FAA
LINCS Leased Interfacility NAS Communication System FAA
LLC Logical Link Control FAA
LLWAS Low-Level Wind shear Alert System FAA
LNA Low Noise Amplifier FAA
LNAV Lateral Navigation FAA
LNB Low-noise block down-converter FAA
LO Local Oscillator FAA
LOA Limited Operational Assessment FAA
LOB Line of Business FAA
LOC Location Identifier FAA
LOE Level of Effort FAA
LOF Loss of Function FAA
LOGSA Logistics Support Activity FAA
LOI Loss of Integrity FAA
LOM Compass Locator at ILS Outer Marker FAA
LON Loss of Navigation FAA
LOP Line Of Position FAA
LORA Level Of Repair Analysis FAA
LORAN Long Range Navigation System FAA
LORAN-C Long Range Navigation-C System FAA
LORIPP Loran Integrity Performance Panel FAA
LOS 1. Line Of Sight FAA
LOS 2. Loss of Signal FAA
LPA Linear Power Amplifier FAA
LPV Localizer Performance with Vertical Guidance FAA
LRE Latest Revised Estimate FAA
LRIP Low-Rate Initial Production FAA
LRR Low-Range Radar FAA
LRRAP Long Range Resource Allocation Planning FAA
LRU Line Replaceable Unit FAA
LSA Logistics Support Analysis FAA
LSAP Logistics Support Analysis Plan FAA
LSAR Logistics Support Analysis Record FAA
LSB Last Significant Bit FAA
LSB Least Significant Bit FAA
LSDU Link Service Data Unit FAA
LSR Least Squares Residual FAA
LSU Long Signal Unit FAA
LTC Long Term Correction FAA
LTCP Long-Term Correction Processing FAA
M More Data Bit FAA
m Meter FAA
M max CT Maintenance Maximum Corrective Time FAA
M mean CT Maintenance Mean Corrective Time FAA
M&C Monitor and Control FAA
m/s Meters per Second FAA
m/s2 Meters per Second Squared FAA
MAGR Miniaturized Aviation GPS Receiver FAA
MAHP Missed Approach Holding Waypoint FAA
MALSR Medium Intensity Approach Lighting System with Runway Indicator Light FAA
MAP Missed Approach Point FAA
MAPC Major Acquisition Policy Council FAA
MAPP Major Acquisition Policy and Procedures FAA
MAR Major Acquisition Review FAA
MASPS Minimum Aviation System Performance Standards FAA
MAWP Missed Approach Waypoint FAA
MaxDT Maximum Downtime FAA
MB Megabyte FAA
mbps Millibits Per Second FAA
Mbps Megabits per second FAA
MC Multiple Carrier FAA
MCC Mission Control Center FAA
MCF Metroplex Control Facility FAA
MCCP Message Correction Control Part FAA
MCDU Multifunction Control Display Unit FAA
Mchips Megachips FAA
MCP Message Center Processor FAA
Mcps Mega-chips/second FAA
MCOTS Modified Commercial Off The Shelf FAA
MCP Message Center Processor FAA
MCS 1. Multifunction Control Station/Maritime Communications Subsystem FAA
2. Master Control Station FAA
MCV Monitor C&V FAA
MD Medium Dynamic FAA
MDA Minimum Descent Altitude FAA
M-Demo Maintainability Demonstration FAA
MDCRS Meteorological Data Collection and Reporting Service FAA
MDP Maintenance Data Processing System FAA
MDT Mean Down Time FAA
MDVP Modification Development and Verification Plan FAA
MEDLL Multipath Estimating Delay Lock Loop FAA
MESS Message Estimation FAA
MET Multipath Elimination Technique FAA
MGS Master Ground Station FAA
MGY-AFSS Dayton, OH Automated Flight Service Station FAA
MH Message Handling FAA
MHz Megahertz FAA
MIAWS Medium Intensity Airport Weather Service FAA
MIB Management Information Block FAA
Micro-EARTS Microprocessor En Route Automated Radar Tracking System FAA
MIJI Meaconing, Intrusion, Jamming and Interference FAA
MIL Military FAA
MIL-SPEC Military Specification FAA
MIL-STD Military Standard FAA
MINOS Novtel FAA
MIOPS Military Operations FAA
MIPR Military Interdepartmental Purchase Request FAA
MIPS Master Integrated Program Schedule FAA
MJD Modified Julian Date FAA
ML Message Length FAA
MLS Microwave Landing System FAA
MLE Microwave Landing Engineer FAA
mm millimeter FAA
mm/s millimeter per second FAA
mm/s2 millimeter per second squared FAA
M/M Maintainer/Manager FAA
MMD Mean Mission Duration FAA
MMIC Monolithic Microwave Integrated Circuit FAA
MMP MSAS Message Processor FAA
MMR Multi Mode Receiver FAA
MNA Mission Need Analysis FAA
MNPS Minimum Navigation Performance Specification FAA
MNS Mission Need Statement FAA
MNT MSAS Network Time FAA
MO Message Output FAA
MOA Memorandum Of Agreement FAA
MOC Management Operations FAA
Mode-S Mode select; discrete addressable secondary radar system with data-link FAA
MON Minimum Operational Network FAA
MOP Message Output Processing FAA
MOPS 1. Minimum Operations Performance Standards FAA
MOPS 2. Minimum Operational Performance Schedule FAA
MOS Mean Opinion Score FAA
MOSPF Multicast Open Shortest Path First FAA
MOU Memorandum Of Understanding FAA
MOW Maintenance-Of-Way FAA
MP Maintenance Plan FAA
MPPGs Major Procurement Program Goals FAA
MPS Meters Per Second FAA
MPS Maintenance Processor System FAA
mr Milliradians FAA
MRA Mutual Recognition Arrangement FAA
MRD Monitor Receiver Data FAA
MRT Modified Rhyme Test FAA
ms millisecond FAA
MS Monitor Station FAA
MSA Major System Acquisition FAA
MSAS MTSAT Satellite-based Augmentation System FAA
MSB Most Significant Bit FAA
MSBR Master Schedule Baseline Report FAA
MSDP Monitor Station Data Processor FAA
MSE Mean Square Error FAA
MSEE Master of Science, Electrical Engineering FAA
MSG MSAS Signal Generator FAA
MSL Mean Sea Level (altitude above) FAA
MSL Mean Sea Level FAA
MSN Manufacturing Sequence Numbers FAA
MSP Minneapolis St. Paul (Airport ID) FAA
MSS Master Schedule System FAA
MSS Mobile Satellite Service FAA
MSSR Monopulse Secondary Surveillance Radar FAA
MTBCF Mean Time Before Critical Failure FAA
MTBCM Mean Time Before Corrective Maintenance FAA
MTBDE Mean Time Before Downing Events FAA
MTBF Mean Time Between Failures FAA
MTBH Mean Time Between Hazards FAA
MTBM Mean Time Between Maintenance FAA
MTBO Mean Time Between Outages FAA
MTBPM Mean Time Before Preventive Maintenance FAA
MTP Master Test Plan FAA
MTSAT Multi-function Transport Satellite FAA
MTTR Mean Time To Repair/Mean Time To Restore FAA
MTTRF Mean Time To Restore Functions FAA
MU Management Unit FAA
MUX Multiplexer FAA
MVS Multiple Virtual System (Operating System) FAA
MWE Model Work Environment FAA
mW-hr/cm2 Milliwatt hours per centimeter squared FAA
mW/cm2 Milliwatts per centimeter-squared FAA
N Newtons FAA
N Number of Sus in a burst FAA
N/A Not Applicable FAA
N/I Non-Intrusive FAA
NACK No Acknowledgement FAA
NACO National Aeronautical Charting Organization FAA
NAD-27 North American Datum-1927 coordinate system FAA
NAD-83 North American Datum-1938 coordinate system FAA
NADIN National Airspace Data Interchange Network FAA
NAILS National Airspace Integrated Logistics Support FAA
NAILSMT NAILS Management Team FAA
NAK Negative Acknowledgment FAA
NAKRES Negative Acknowledgment Signal and Reservation FAA
NANU Notice Advisory to Navstar Users FAA
NANUS Navigation Notices to Users FAA
NARACS National Radio Communications Systems FAA
NAS National Airspace System FAA
NASA National Aeronautical and Space Administration FAA
NASISLTP NAS Integration/System Level and Test Plan FAA
NASIT&E NAS Integrated Test and Evaluation FAA
NASSRS NAS System Requirements Specification FAA
NAT North Atlantic FAA
NATCA National Air Traffic Controller Association FAA
NATS National Air Traffic Services FAA
NATSPG North Atlantic System Planning Group FAA
NAV navigation FAA
NAVAID Navigational Aid FAA
NAVAIR Naval Air Systems Command FAA
NAVSTAR Navigation System with Timing and Ranging FAA
NBP New Bedford Panoramics FAA
NC National Center FAA
NC Network Connection FAA
NCA National Command Authority FAA
NCC Network Control Circuit FAA
NCD Network Computing Devices FAA
NCEP National Centers for Environmental Prediction FAA
NCF Network Control Facility FAA
NCLF National Civilian Labor Force FAA
NCO Number Controlled Oscillator FAA
NCO Numerically Controlled Oscillator FAA
NCP NAS Change Proposal FAA
NCS Network Communication Subsystem FAA
NCS Network Coordination Station FAA
NCT Network Control Terminals FAA
NDB Non-Directional Beacon FAA
NDBC National Data Buoy Center FAA
NDI Non-Developmental Item FAA
NDS 1. Non-Developmental Software/Nuclear Detonation Detection System FAA
NDS 2. Non-Developmental Software FAA
NE Network Expansion FAA
NEC Nippon Electric Corporation FAA
NES Navigation Earth Station FAA
NESDIS National Environmental Satellite Data and Information Service FAA
NEXCOM Next Generation Air/Ground Communications FAA
NEXRAD Next Generation Radar FAA
NFS Network File System FAA
NGS 1. National Geodetic Service FAA
NGS 2. National Geodetic Survey FAA
NH Northern Hemisphere FAA
NI Non-Interlaced FAA
NICS NAS Inter-facility Communications System FAA
NIMS NAS Infrastructure Management System FAA
NIC Network Information Center FAA
NIS Network Information System FAA
NIST National Institute of Science and Technology FAA
NIU Network Interface Unit FAA
NLS Network Logic Schedule FAA
Nm Nautical Mile FAA
NMC National Meteorological Center FAA
NMS Navigation Management System FAA
NOAA National Oceanic and Atmospheric Administration FAA
NOC Network Operations Center FAA
NOS National Ocean Survey FAA
NOTAM Notice To Airmen FAA
NP NES Processing CSCI FAA
NPA Non-Precision Approach FAA
NPCI Network Protocol Control Information FAA
NPD Navigation Payload FAA
NPDU Network Protocol Data Unit FAA
NPRM Notice of Proposed Rule Making FAA
NPV Non-Precision Approach with Vertical Guidance FAA
NQSS Network Quality of Service Subsystem FAA
NRE Non-Recurring Engineering FAA
NRZ Non-return to zero FAA
NS Non-Standard C/A FAA
NSDU Network Service Data Unit FAA
NSE Navigation System Error FAA
NSEC Nanosecond FAA
NSI Network Subsystem Interface FAA
NSP Non-Standard P-code FAA
NSTB National Satellite Test Bed FAA
NSY Non-Standard Y-code FAA
NTE Not To Exceed FAA
NTP National Transportation Policy FAA
NTSC National Television Standards Committee FAA
NTT Nippon Telegraph and Telephone FAA
NUT Nutation FAA
NVREC Navigation Recovery FAA
NWS National Weather Service FAA
NWSTG National Weather Service Telecommunications Gateway FAA
O&M Operations and Maintenance FAA
OAC Oceanic Area Control Center FAA
OALP Outgoing Aeronautical Logic Procedures FAA
OASIS Oceanic Area System Improvement Study FAA
OASIS Operational and Supportability Implementation System FAA
OATS Office Automation Technology Services FAA
OBI Orbit Integration FAA
OBS Omni Bearing Selector FAA
OBAD Old But Active Data FAA
OCA Obstacle Clearance Area FAA
OCC Operations Control Center FAA
OCD Oceanic Clearance Delivery FAA
OCONUS Outside Continental United States FAA
OCP Obstacle Clearance Panel FAA
OCS Operational Control Segment FAA
OCXO Oversized Controlled Crystal Oscillator FAA
OD Orbit Determination Processing Algorithms FAA
ODAPS Oceanic Display and Planning System FAA
ODC 1. Orbit Determination Control FAA
ODC 2. Other Direct Charges FAA
ODE Orbit Determination Data Editing FAA
ODF Oceanic Development Facility FAA
ODG Orbit Determination Geometry FAA
ODR Office of Disputes Resolution FAA
OEAAA Obstacle Evaluation and Airspace Assessment FAA
OEI O & M External Interface FAA
OEM Original Equipment Manufacturer FAA
OEP Operational Evolution Plan FAA
OIS Orbital Insertion Subsystem FAA
OIS Obstruction Identification Surface FAA
OJT On-the-Job Training FAA
OLDI On-Line Data Interchange FAA
OM Operations and Maintenance FAA
OMB Office of Management and Budget FAA
OMC Observed Minus Computed FAA
OMEGA Ground-based VLF Navigation System FAA
OMT Object Modeling Technique FAA
OOOI Out Off On In FAA
OOS Out Of Service FAA
OpEval Operational Evaluation FAA
OPI Office of Primary Interest FAA
OPM Opportunistic PM FAA
OPR Offices of Primary Responsibility FAA
OPS Operations FAA
OPT Organizational Performance Target FAA
ORD Operation Readiness Demonstration FAA
ORD Operational Requirements Document/Observed Range Deviations FAA
ORDA Open Radar Data Acquisition FAA
ORPG Open System Radar Generator FAA
OS 1. O&M Simulator FAA
OS 2. Operating System FAA
OSI Open Systems Interconnection FAA
OSM Oceanic Systems Manager FAA
OSP Operational System Parameter FAA
OSPF Open Shortest Path First FAA
OST Office of the Secretary Of Transportation FAA
OT Operational Testing FAA
OTA Other Transition Authority FAA
OT&E Operational Test and Evaluation FAA
OT&E/I OT&E Integration FAA
OT&E/O OT&E Operation FAA
OT&E/S OT&E Shakedown FAA
OTH Over the Horizon FAA
OTP Operational Test Plan FAA
P Precision FAA
P-Channel Precision Code Channel FAA
P-CODE Precision Code FAA
P-SAT Preliminary Site Acceptance Test FAA
P-STATIC Precipitation Static FAA
P/A Parameter/Assembly FAA
P3I Preplanned Product Improvement FAA
PA Precision Approach FAA
PAMS Program Acquisition Management System FAA
PANS Procedures for Air Navigation Services FAA
PANS-OPS PANS Aircraft Operations FAA
PAPI Precision Approach Path Indicator FAA
PAR Precision Approach R