Aviation Acronym Definitions

These acronyms are used across the world for aviation purposes.


Acronym Meaning Source
A Amber ICAO
A/A Air to air AIS
A/G Air-to-ground AIS
A&P Airframes and Powerplants FAA
AA Airservices Australia
AAA Amended meterological message ICAO
AAAA Aerial Agricultural Association of Australia
AAC Airworthiness Advisory Circular CAR 1988
AACC Area approach control centre AIS
AAD Assigned altitude deviation AIS
AAIM Aircraft Autonomous Integrity Monitor
AAIS Automatic aerodrome information service AIS
AAL Above aerodrome level AIS
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 AIS
ABN Aerodrome beacon AIS
ABV Above... AIS
AC Advisory Circular (document supporting 1998 CASRs) CASR 1998
AC Altocumulus (met) ICAO/AIP
ACA Australian Commonwealth Authority
ACARS Aircraft communication addressing and reporting system (pronounced 'AY-CARS') AIS
ACAS Airborne Collision Avoidance System CAR 1988
ACC Area control centre AIS
ACCID Initial notification of an aircraft accident AIS
ACD Airways clearance delivery AIS
ACFT Aircraft AIS
ACJ-XXX Advisory Circular Joint (issued by the JAA, can be followed by a country code) JAA
ACK Acknowledge AIS
ACL Altimeter check location ICAO
ACN Aircraft classification number ICAO
ACN Australian company number
ACPT Accept, accepted AIS
ACROB Acrobatics
Act the Civil Aviation Act 1988
ACT Active, activated, activity AIS
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 AIS
ADDGM Aerodrome diagrams AIS
ADDN Addition, additional AIS
ADF Automative Direction Finding (equipment) AIS
ADIZ Air Defence Identification Zone ICAO/AIS
ADJ Adjacent AIS
ADO Aerodrome office ICAO
ADQ Adequate aerodrome AIS
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 AIS
AEB CASA's Airworthiness Engineering Branch CASA
AEP Aerodrome emergency plan AIS
AER Authorised Engineering Representative CASR Part 183
AERIS Automatic en route information service AIS
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 AIS
AFIS Aerodrome flight information service ICAO/AIP
AFM Aircraft Flight Manual CAR 1988
AFM Yes, affirm, affirmative, that is correct AIS
AFRU Aerodrome Frequency Response Unit (also known as a "beepback" unit) AIS
AFS Aeronautical fixed service ICAO/AIP
AFTN Aeronautical fixed telecommunication network ICAO
AFZ Australian fishing zone(s) AIS
Ag Agriculture
AGD Attorney-General's Department
AGE Aircraft Ground Equipment WATOG
AGL Above Ground Level ICAO/AIP
AH After hours AIS
AH Artificial Horizon
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
AIRAC Aeronautical Information Regulation and Control ICAO/AIP
AIRC Aeronautical Information and Control ICAO
AIRMET Information in plain language concerning weather significant to light aircraft operations at or below 10,000FT AIS
AIS Aeronautical Information Service AIP
AL Approach Lights AIS
ALA Aircraft Landing Area (for purpose of CAR 1988 92(1)(d)) 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 AIS
ALERFA Alert phase AIS
ALI Airworthiness Limitation Item
ALM Aircraft Landing Minima AIS
ALR Alerting Message AIS
ALRS Approach lighting system ICAO
ALS Approach Lighting System AIS
ALT Altitude AIS
ALTN Alternate, Alternating (light alternates in colour) AIS
ALTN Alternate (aerodrome) AIS
AMA Area minimum altitude ICAO
AMC Acceptable Means of Compliance
AMD Amend, Amended AIS
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
AMSL Above Mean Sea Level AIS
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) AIS
ANCS Aeronautical navigation chart - small scale (followed by name/title and scale) ICAO
ANO Air Navigation Order (now CAO)
ANTA Australian National Training Authority CASR Part 66
ANVIS Aviator Night Vision Imaging Systems
AO Air Operator
AOC Aerodrome Obstacle Chart (followed by name/title) AIS/AIP
AOC Air Operators Certificate CASR Part 119
AOCM Air Operators Certification Manual
AOD Alcohol and Other Drug CASA
AOG Aircraft On Ground WATOG
AOPA Aircraft Owners and Pilots Association
AP Airport AIS
APAPI Abbreviated Precision Approach Path Indicator (pronounced 'AY-PAPI') AIS
APCH Approach AIS
APDC Aircraft Parking/Docking Chart (followed by name/title) AIS
APF Australian Parachute Federation
APMA Australian Parts Manufacturer Approval CASR Part 21
APP Approach Control AIS
APRX Approximate, Approximately AIS
APSG After Passing AIS
APU Auxillary power unit ICAO
APV Approach with Vertical Guidance
APV Approve, Approved, Approval AIS
ARC Advance Regulatory Change (legislative change project) CASA
ARFFS Aerodrome Rescue and Fire Fighting Service (sometimes referred to as RFFS) CASR Part 139
ARFL Aeroplane Reference Field Length AIS
ARFO Area Forecast
ARG Aviation Reform Group
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 AIS
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 AIS
ARS Special Air-Report (message type designator) AIS
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 AIS
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 AIS
ASH Aviation Services Handbook
ASI Air Speed Indicatort
ASI Aviation Safety Index
ASIR Aviation Safety Incident Report
ASR Area Surveillance Radar AIS
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') AIS
AT... At (followed by time at which weather change is forecast to occur) ICAO
ATA Actual Time of Arrival AIS
ATA Air Transport Association
ATC Air Traffic Control (in general) ICAO/AIP
ATD Actual Time of Departure AIS
ATE Automatic Test Equipment WATOG
ATEL/ANAV Aeronautical Telecommunication and Radio Navigation Services CASR Part 171
ATFM Air Traffic Flow Management AIS
ATIS Automatic terminal information service ICAO
ATM Air traffic management ICAO/AIP
ATN Aeronautical telecommunications network ICAO
ATO Aviation Testing Officer
ATO Aviation Training Organisatio
ATOG CASA's Air Transport Operations Group CASA
ATP At.. (time or place) ICAO
ATPL Airline Transport Pilot Licence
ATS Air Traffic Service(s) CASR Part 172
ATSB Australian Transport Safety Bureau
ATSO Australian Technical Standard Order CASR Part 21
ATSOA Australian Technical Standard Order Authorisation CASR Part 21
ATTN Attention AIS
ATZ Aerodrome traffic zone ICAO
AUF Australian Ultralight Federation (now Recreational Aviation Australia)
AUG August AIS
AUTH Authorised, Authorisation AIS
AUW All Up Weight AIS
AUX Auxiliary AIS
AVBL Available AIS
AVG Average AIS
AVGAS Aviation Gasoline AIS
AVM Abrupt Vertical Manoeuvres (by the MIL) AIS
AWB Airworthiness Bulletin
AWIB Aerodrome Weather Information Broadcast AIS
AWK Aerial Work (Air work - general aviation) AIS
AWS Automatic Weather Station AIS
AWTA Advise as to what time is available ICAO
BA Braking action ICAO
BASA Bilateral Aviation Safety Agreement
BASE Cloud Base (met) AIS
BASI Bureau of Air Safety Investigation (now part of ATSB)
BCFG Fog Patches (met) AIS
BCN Beacon (aeronautical ground light) AIS
BCST Broadcast AIS
BDRY Boundary AIS
BECMG Becoming AIS
BETA Manually controlled mode for constant speed propellers or turbo prop aircraft
BFR Before AIS
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) AIS
BL... Blowing (followed by DU=dust, SA=sand or SN=snow) AIS
BLDG Building AIS
BLO Below Clouds AIS
BOM Bureau of Meteorology AIS
BOMB Bombing AIS
BRF Short (used to indicate type of approach) AIS
BRG Bearing AIS
BRKG Braking AIS
BRW Brakes release weight
BS Broadcasting Station (Commercial) AIS
BTL Between Layers AIS
BTN Between AIS
C Degrees Celsius (Centigrade) AIS
C Centre (Runway) AIS
CA Course Acquisition
CA/GRO Certified Air/Ground Radio Operator CASR Part 139
CA/GRS Certified Air/Ground Radio Service CASR Part 171
CAA Civil Aviation Authority
CAA NZ Civil Aviation Authority New Zealand
CAAP Civil Aviation Advisory Publication CAR 1988
CAGRO Certified Air Ground Radio Operation AIP
CAMP Continuous Airworthiness Maintenance Program CASR Part 145
CAO Civil Aviation Order
CAR Civil Aviation Regulation (1988) [existing]
CAR Civil Aviation Regulation (1998) [now known as 1998 CASR)
CAS Calibrated air speed ICAO
CASA Civil Aviation Safety Authority
CASR Civil Aviation Safety Regulation
CAT Category AIS
CAT Clear Air Turbulence AIS
CAVOK Visibility, cloud and present weather better than prescribed values or conditions AIS
CB Cumulonimbus (met) AIS
CBT Competency-based Training
CC Cirrocumulus (met) AIS
CCA Corrected meteorological message (for CCB, CCC..etc in sequence) (message type designator) ICAO
CCF Capability Check Flight
CCTS Circuits AIS
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 AIS
CEO Chief Executive Officer
CET Clearance Expiry Time AIS
CF Change Frequency to AIS
CFI Chief Flying Instructor CAR 1988
CFIT Controlled Flight into Terrain
CFL Cleared Flight Level AIS
CFM Confirm, I confirm AIS
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 AIS
CI Cirrus (met) AIS
CIDIN Common ICAO data interchange network ICAO
CIR Command Instrument Rating CAR 1988
CIT Near, Over Large Town(s) AIS
CK Check AIS
CL Centre Line AIS
CLA Clear type of ice formation AIS
CLBR Calibration AIS
CLD Cloud (met) AIS
CLG Calling AIS
CLIAS Climbing Indicated Airspeed AIS
CLMAX Maximum Co-efficient of Lift
CLR Clear, Cleared to... Clearance AIS
CLSD Closed, Close, Closing AIS
CM (cm) Centimetre AIS
CMB Climb to or Climbing to AIS
CMM Component Maintenance Manual WATOG
CMPL Configuration, Maintenance and Procedures
CMPL Completion, Completed, or Complete AIS
CMR Certification Maintenance Requirements
CMSD Commissioned AIS
CNL Cancel AIS
CNL Flight plan cancellation message AIS
CNS Communications, Navigation and Surveillance AIS
COA Certificates of Approval (issued to maintenance organisations) CAR 1988
CoA Certificate of Airworthiness CAR 1988
COM Communications AIS
CONC Concrete AIS
COND Condition AIS
CONS Continuous AIS
CONST Construction, Constructed AIS
CONT Continue(s), Continued AIS
COOR Coordinate, Coordinated AIS
COORD Coordinates AIS
COP Change over point ICAO
CoR Certificate of Registration CAR 1988
COR Correct, Corrected, Correction AIS
COS Conical Surface AIS
COT At the Coast, Coastal AIS
COV Cover, Covered, Covering AIS
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 AIS
CS Cirrostratus (met) AIS
CS Call sign AIS
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 AIS
CTAF Common Traffic Advisory Frequency CASR Part 172/AIP
CTAF(R) Common Traffic Advisory Frequency - (Radio) AIS
CTAM Climb to and maintain ICAO
CTC Category Technical Competency CAR 1988
CTL Control AIS
CTN Caution AIS
CTR Control Zone AIP
CU Cumulus (met) AIS
CUF Cumuliform (met) AIS
CUST Customs AIS
CVR Cockpit voice recorder ICAO/AIP
CW Carrier Wave ICAO
CWY Clearway AIS
D Deleted AIS
D Downward (tendency in RVR (Runway visual range) during previous 10 minutes) ICAO
D-ATIS Data Link Automatic Terminal Information Service (pronounced'DEE-ATIS') AIS
D... Danger Area (followed by identification) AIS
DA Decision Altitude AIS
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
DCA Department of Civil Aviation (previous to CASA)
DCD Double channel duplex ICAO
DCKG Docking AIS
DCMSD Decommissioned AIS
DCPC Direct Controller-Pilot Communications AIS
DCS Double channel simplex ICAO
DCT Direct (in relation to flight plan clearances and type of approach) AIS
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 AIS
DEG Degrees AIS
DEP Depart, Departure, Departed, Departing, Departure Message AIS
DER Departure End of Runway AIP
DER Designated Engineering Representative FAR
DES Descend to, Descending to AIS
DEST Destination AIS
DETRESFA Distress Phase AIS
DEV Deviation, Deviating AIS
DF Direction Finder/ Finding AIS
DFDR Digital Flight Data Recorder AIS
DFTI Distance from touchdown indicator ICAO
DGA Distance Measuring Equipment or Global Positioning Satellite System Arrival
DH Decision Height ICAO
DIF Diffuse AIS
DISP Displaced AIS
DIST Distance AIS
DIV Diversion, Divert, Diverting AIS
DLA Delay (message type designator) ICAO/AIP
DLIC Data Link Initiation Capability AIS
DMC Direct Maintenance Cost WATOG
DME Distance Measuring Equipment ICAO/AIP
DMEN DME (International) AIS
DMEP DME (International Precision used in conjunction with Microwave Landing System) AIS
DNG Danger, Dangerous AIS
DOC Direct Operating Cost WATOG
DOC Documents AIS
DoD Department of Defence
DOM Domestic AIS
DOTARS Department of Transport and Regional Services
DP Dew Point Temperature ICAO/AIP
DP Discussion Paper CASA
DR Dead Reckoning (navigation) ICAO
DR... Low drifting (followed by DU=dust, SA=sand or SN=snow) AIS
DRG During AIS
DS Dust storm AIS
DSB Double sideband ICAO
DTAM Descend to And Maintain AIS
DTG Date-Time Group AIS
DTHR Displaced Runway Threshold AIS
DTRT Deteriorate, Deteriorating AIS
DTW Dual tandem wheels ICAO
DUC Dense Upper Cloud (met) AIS
DUPE This is a duplicate message (to be used in Aeronautical Fixed Service as a procedure signal) ICAO
DUR Duration AIS
DW Dual wheels ICAO
DZ Drizzle AIS
E East, East Longitude AIS
E  E  E Error (to be used in AFS as a procedure signal) ICAO
EASA European Aviaton Safety Agency
EAT Expected Approach Time AIS
EB Eastbound AIS
ECAR European Civil Aviation Requirement (formerly JAR)
EDTO Extended Diversion Time Operations
EET Estimated Elapsed Time AIS
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 AIS
ELR Extra Long Range AIS
ELT(S) Emergency Locator Transmitter (Survival) CAR 1988
EM Engine Manual WATOG
EM Explanatory Memorandum (submitted to EXCO with regulation amendment)
EM Emission AIS
EMBD Embedded in a Layer (to indicate cumulonimbus embedded in layers of other clouds) AIS
EMERG Emergency AIS
EMS Emergency Medical Service
EMS Environment Management System
END Stop-end (related to RVR) ICAO
ENDCE Endurance AIS
ENE East North-East AIS
ENG Engine AIS
ENR En Route AIS
ENRC En Route Chart (followed by name/title) AIS
EOBT Estimated off Blocks Time AIS
EPA Environment Protection Agency
EPIRB Electronic Position Indicating Radio Beacon (marine term.) AIS
EQPT Equipment AIS
ER Here..or herewith ICAO
ERC En-route Chart AIS
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 AIS
ESIR Electronic safety incident report
EST Estimate or estimated or estimate (message type designator) AIS
ETA Estimated Time of Arrival, Estimating Arrival AIS
ETCM Engine trend and condition monitoring
ETD Estimated Time of Departure, Estimating Departure AIS
ETO Estimated Time Over significant point AIS
ETOPS Extended range operations by turbine-engined aeroplanes ICAO
ETP Equi Time Interval
ETT Estimated Time Interval
EV Every AIS
EVU Enforceable Voluntary Undertaking Section 30DK of the Civil Aviation Act 1988
EXC Except AIS
EXCO Executive Council
EXCOS Executive Council Secretariat
EXER Exercises, Exercising, to exercise AIS
EXP Expect, Expected, Expecting AIS
EXTD Extend, Extending, Extended AIS
F Fixed (chart symbol) AIS
FAA Federal Aviation Administration of the USA
FAAOC Foreign Aircraft Air Operator's Certificate CASR Part 129
FAC Facility, Facilities AIS
FADEC Full Authority Digital Engine Control
FAF Final Approach Fix AIP/ICAO
FAL Facilitation of International Air AIS
FAP Final Approach Point AIP/ICAO
FARs Federal Aviation Regulations (Federal Aviation Administration, Department of Transportation, USA)
FATO Final approach and take-off area ICAO/AIP
FAWP Final Approach Waypoint AIS
FAX Facsimile Transmission AIS
FBL Light (used to indicate the intensity of WX phenomena, interference or static reports, eg BL RA = light rain) AIS
FC Funnel Cloud (tornado or water spout) AIS
FCST Forecast AIS
FCT Friction coefficient ICAO
FD Fault Detection
FDE Fault detection and exclusion (in relation to GPS equipment)
FDL Fixed Distance Lighting AIS
FDPS Flight Data Processing system AIS
FDS Flight Director System
FEB February AIS
FEW Few (cloud descriptor) AIS
FFR Flood, Fire Relief AIS
FIA Flight Information Area AIS
FIC Flight Information Centre AIS
FIO Flight Information Office AIS
FIR Flight Information Region ICAO/AIP
FISA Flight information service (automated) ICAO
FISS Flight Information Service Station AIS
FIX Fault Isolation Manual WATOG
FL Flight Level ICAO/AIP
FLG Flashing AIS
FLIR Forward Looking Infra Red
FLR Flares AIS
FLTCK Flight check ICAO/AIP
FLUC Fluctuating, Fluctuation, Fluctuated AIS
FLW Follow(s), Following AIS
FLY Fly, Flying AIS
FM... From (followed by time weather change is forecast to begin) AIS
FMS Flight Management System AIS
FMS Fatigue management system CAR 1998
FMS Flight management system ICAO
FMU Flow Management Unit AIS
FNA Final Approach AIS
FNPT Flight and Navigation Procedures Trainer ICAO
FOD Foreign Object Damage WATOG
FOI Flying Operations Inspector
FPD Flight Plan Designator AIS
FPL Filed Flight Plan Message AIS
FPM Feet per Minute AIS
FPR Flight Plan Route AIS
FR Fuel Remaining AIS
FREQ Frequency AIS
FRM Fault Reporting Manual WATOG
FRMS Fatigue Risk Management System
FRONT Front (relating to weather) ICAO
FRQ Frequent AIS
FS Flight Service (in general) AIS
FSL Full Stop Landing AIS
FSP Fish Spotting AIS
FSS Flight service station ICAO
FTD Flight training device CASR Part 60
FTE Full time equivalent
FTO Flight Training Organisation
FU Smoke AIS
FZ Freezing AIS
FZDZ Freezing Drizzle AIS
FZFG Freezing Fog AIS
FZL Freezing Level AIS
FZRA Freezing Rain AIS
G Gravity
G Green AIS
G-G Governor-General
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 AIS
GAMET Area forecast for low-level flights ICAO
GAOG CASA's General Aviation Operations Group CASA
GAPAN Guild of Air Pilots and Navigators
GBAS Ground Based Augmentation System
GCA Ground Controlled Approach AIS
GCN General Computing Network (operated by Airservices Australia) AIS
GDOP Geometric Dilution of Precision
GEN General AIS
GEO Geographic, true AIS
GES Ground Earth Station AIS
GFA The Gliding Federation of Australia
GFY Glider Flying AIS
GHA Ground handling agents
GIVD Gravity Induced Vestibular Dysfunction
GLD Glider AIS
GLOC Gravity Induced Loss of Consciousness
GLONASS Global Orbiting Navigation Satellite System (pronounced 'GLO-NAS') AIS
GM Guidance Material
GMC Ground Movement Chart (followed by name/title) AIS
GND Ground AIS
GNDCK Ground Check AIS
GNS Global Navigation System AIS
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) AIS
GPI Glide Path Intercept AIS
GPS Global positioning system (see GNSS)
GPWS Ground proximity warning system
GRAD Minimum Required Climb Gradient AIS
GRAS Ground Based Regional Augmentation System
GRASS Grass Landing Area AIS
GRIB Processed meteoroglogical data in the form of grid point values expressed in binary form (aeronautical meterological code) ICAO/AIP
GS Groundspeed AIS
GS Small Hail and/or Snow Pellets AIS
GSE Ground Support Equipment WATOG
GUND Geoid Undulation AIS
H24 Continuous day and night service AIS
HAA Height Above Aerodrome AIS
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 AIS
HBN Hazard Beacon AIS
HDF High frequency direction-finding station ICAO
HDG Heading AIS
HDS Hours of Daylight Saving AIS
HEL Helicopter AIS
HF High Frequency (3000 to 30,000 KHZ) AIS
HFEM Human Factor and Error Management System
HGFA Hang Gliding Federation of Australia Inc
HGS Heads-up Guidance System
HGT Height, Height Above AIS
HIAL High Intensity Approach Lighting AIS
HIOL High Intensity Obstacle Lights AIS
HIRL High Intensity Runway Lighting AIS
HJ Sunrise to Sunset AIS
HLDG Holding AIS
HLS Helicopter Landing Site AIS
HMI Human-machine Interface
HN Sunset to Sunrise AIS
HO Service available to meet operational requirements AIS
HOFO Head of Flying Operations
HOL Holiday
HOSP Hospital Aircraft AIS
HOTAS Head of Training and Standards
HOTC Head of Training and Checking
HP Horse Power
HPA HectoPascal AIS
HR Hours AIS
HS Homestead AIS
HS Service available during hours of scheduled operations AIS
HSL Hold Short Lights AIS
HUD Heads Up Display
HURCN Hurricane AIS
HVDF High and very high frequency direction finding stations (at the same location) AIS
HVY Heavy (used to indicate the intensity of WX phenomena, eg HVY RA = heavy rain) AIS
HX No specific working hours AIS
HYR Higher AIS
HZ (hz) Hertz AIS
HZS Horizontal Surface AIS
IA Inspection authorisation FAR
IAC Instrument approach chart (followed by name/title) ICAO/AIP
IAF Initial Approach Fix AIS
IAL Instrument Approach and Landing Chart AIS
IAO In and out of clouds AIS
IAP Instrument Approach Plate
IAR Intersection of air routes ICAO
IAS Indicated air speed ICAO
IATA International Air Transport Association
IAW In Accordance With
IAWP Initial Approach Way-point AIS
IBN Identification Beacon AIS
IC Ice Crystals (MET code) AIS
ICA Instructions for continuing airworthiness (issued by manufacturer or designer) CAR 1998
ICAO International Civil Aviation Organization ICAO
ICE Icing, Ice AIS
ICUS In-command Under Supervision
ID Identifier, identify AIS
IDENT Identification AIS
IF Instrument Flight
IF Intermediate Approach Fix AIS
IFF Identification Friend/Foe AIS
IFR Instrument flight rules ICAO/AIP
IFSD In-flight Shutdown
IG Implementation Group
IGA International general aviation /AIPICAO
ILS Instrument Landing System AIS
IM Inner Marker AIS
IMC Instrument meteorological conditions (other than VMC) CAR 1988
IMC Indirect Maintenance Cost WATOG
IMG Immigration AIS
IMI Interrogation sign ICAO
IMPR Improve, Improving, Improvement AIS
IMT Immediate, Immediately AIS
INA Initial approach ICAO
INBD Inbound AIS
INC In Cloud AIS
INCERFA Uncertainty Phase AIS
INFO Information AIS
INOP Inoperative AIS
INP If not possible ICAO
INPR In progress ICAO
INS Inertial Navigation System AIS
INSTL Install, Installed, Installation AIS
INSTR Instrument AIS
INT Intersection AIS
INTER Intermittent, Intermittently (meteorological) AIS
INTL International AIS
INTRG Interrogator AIS
INTRP Interrupt, Interruption, Interrupted AIS
INTSF Intensify, Intensifying AIS
INTST Intensity AIS
IoA Instrument of appointment CAR 1988
IOC Indirect Operating Cost WATOG
IOE Initial Operational Experience
IPC Illustrated Parts Catalogue WATOG
IR Ice on runway ICAO
IREX Instrument Training Examination
IRM Immediately Reportable Matters
IRS Internal Reporting System
ISA International Standard Atmosphere AIS
ISB Independent Sideband AIS
ISG CASA's Information Services Group CASA
ISIM Integrated Safety Investigation Methodology
ISO9000 International Organization for Standardization
ISOL Isolated AIS
ITT Interstage Turbine Temperature
IWI Illuminated Wind Indicator AIS
IWP Intermediate Way-point AIS
J-BAR Jet Barrier AIS
JAA Joint Aviation Authorities (of Europe)
JAN January AIS
JAR Joint Aviation Requirements (of the European JAA)
JAR-OPS JAR Operations
JF Saturday, Sunday and PH AIS
JO Monday to Friday except PH AIS
JTSO Joint Technical Standard Order
JTST Jet Stream AIS
KDR Knowledge Deficiency Report
KG (kg) Kilograms AIS
KHZ (kHz) Kilohertz AIS
KM (km) Kilometers AIS
KMH (km/h) Kilometers per Hour AIS
KPA (kPa) Kilopascals AIS
KT (kt) Knots AIS
KW (kw) Kilowatts AIS
L Left (runway identification) AIS
L Locator (see LM, LO) AIS
LAAS Local Area Augmentation System
LAHSO Land and Hold Short Operations AIS
LAME Licensed Aircraft Maintenance Engineer CASR Part 66
LAN Inland AIS
LAT Latitude AIS
LDA Landing distance available ICAO/AIP
LDG Landing AIS
LDI Landing Direction Indicator AIS
LDP Landing decision point ICAO
LEN Length AIS
LF Low Frequency (30 to 300 KHZ) AIS
LGT Light, Lighting AIS
LGTD Lighted AIS
LIH Light Intensity High AIS
LIL Light Intensity Low AIS
LIM Light Intensity Medium AIS
LIOL Low Intensity Obstacle Lights AIS
LIRL Low Intensity Runway Lights AIS
LJR Low Jet Route AIS
LL Lower Limit AIS
LLN Low-level Navigation (by the MIL) AIS
LLO Low Level Operations (by the MIL) AIS
LLZ Localizer AIS
LM Locator (middle) AIS
LMT Local mean time AIS
LO Locator (outer) AIS
LOC Locally, Location, Located, Local AIS
LOE Lane of Entry AIS
LONG Longitude AIS
LOSA Line Operations Safety Audit
LPT Liquid Penetrant Test
LRCS Long-range communication system FAR
LRG Long Range AIS
LRI Line Replaceable Item WATOG
LRNS Long-range navigation system FAR
LRU Line Replaceable Unit WATOG
LSA Light Sport Aircraft
LSALT Lowest safe altitude
LSG CASA's Legal Services Group CASA
LTD Limited AIS
LUL Lowest Usable Level AIS
LV Light and Variable (relating to wind) AIS
LVE Leave, Leaving AIS
LYR Layer, Layered AIS
M Mach number (followed by figures ie .02 = Mach .02) AIS
M (m) Metres (preceded by figures) AIS
M/E Multi-engine
MAAT Manual Authoring and Assessment Tool
MAE Men and Equipment AIS
MAG Magnetic AIS
MAHWP Missed Approach Holding Way-point AIS
MAINT Maintenance AIS
MAN Manual AIS
MAP Aeronautical Maps and Charts AIS
MAP Manifold Air Pressure
MAPT Missed Approach Point ICAO/AIP
MAUW Maximum All Up Weight
MAWP Missed Approach Waypoint AIS
MAX Maximum AIS
MBST Microburst AIS
MBZ Mandatory Broadcast Zone AIP
MCANTO CASA's Manufacturing, Certification and New Technologies Office (Now Airworthiness Engineering Branch) CASA
MCC Multi-crew Co-ordination
MCM Maintenance control manual CASR Part 145
MCQFS Manual of criteria for the qualification of flight simulators ICAO Doc 9625-AN/938 CASR Part 60
MCUR Mean Cycles Between Unscheduled Removals WATOG
MCW Modulated Continuous Wave AIS
MDA Minimum Descent Altitude AIS
MDF Medium Frequency Direction Finding Station AIS
MDR Major Defect Report CAR 1988
MEA Minimum En-route Altitude AIS
MED Medical AIS
MEL Minimum equipment list ICAO
MERSITAB Manufacturing, Engineering and Related Services Industry Training Advisory Body CASR Part 66
MET Meteorological, Meteorology AIS
MET REPORT Aviation routine weather report AIS
METAR Aviation routine weather report (in aeronautical meteorological code) AIS
MF Medium Frequency (300 to 3000 KHZ) AIS
MHZ (mhz) Megahertz AIS
MIFG Shallow Fog AIS
MIL Military AIS
MIL-STD Military Standard
MIN Minutes AIS
MIOL Medium Intensity Obstacle Lights AIS
MIRL Medium Intensity Runway Lights AIS
MISC Miscellaneous AIS
MKR Marker Radio Beacon AIS
MLJ Military Low Jet AIS
MLJR Military Low Jet Route AIS
MLS Microwave Landing System AIS
MLW Maximum Landing Weight AIS
MM Middle Marker AIS
MMEL Master minimum equipment list ICAO
MNM Minimum AIS
MNT Monitor, Monitoring, AIS
MNTN Maintain, Maintained, Maintaining AIS
MOA Military Operating Area AIS
MOC Minimum obstacle clearance (required) ICAO/AIP
MOD Moderate, Moderately AIS
MOD Moderate (used to indicate the intensity of WX phenomena, interference or static reports, eg MOD RA = moderate rain). AIS
MON Above Mountains AIS
MON Monday AIS
MOPS Minimum Operational Performance Standards AIS
MOS Manual of Standards CAR 1998
MOU Memorandum of understanding
MOV Move, Moved, Moving, Movement AIS
MOWP Method of Working Plan AIS
MPD Maintenance Planning Data ATA/FAR
MPI Magnetic Particle Inspection
MPL Multi-crew Pilot Licence (MPL) ICAO Annex 1 'Personnel Licensing'
MPS Metres per Second AIS
MPT Magnetic Particle Inspection Technician
MRB Maintenance Review Board ATA/FAR
MRBR Maintenance Review Board Report
MRG Medium Range AIS
MRO Maintenance, repair and overhaul CASR Part 145
MRP ATS/MET Reporting Point AIS
MS Minus AIS
MSA Minimum sector altitude AIP
MSAS Multi-function Transport Satellite (MTSAT) Satellite-based Augmentation System
MSDS Material Safety Data Sheets
MSG Message AIS
MSG Maintenance Steering Group ATA/FAR
MSG-3 Maintenance Steering Group Logic Process
MSI Maintenance Significant Item WATOG
MSL Mean Sea Level AIS
MSOS Maintenance specific operation specification CASR Part 145
MSSR Monopulse Secondary Surveillance Radar AIS
MT Mountain AIS
MTBF Mean Time Between Failure WATOG
MTBR Mean Time Between Removals WATOG
MTBUR Mean Time Between Unscheduled Removals WATOG
MTO Maintenance training organisation CASR Part 147
MTOW Maximum take-off weight AIP
MTP Maximum Tyre Pressure AIS
MTSAT Multi-function Transport Satellite
MTTF Mean Time To Failure WATOG
MTTR Mean Time To Repair WATOG
MTTUR Mean Time To Unscheduled Removal WATOG
MTUR Special Term For Data Transmittal WATOG
MTW Mountain waves AIS
MVA Minimum Vector Altitude AIS
MWO Meteorological Watch Office AIS
MX Mixed type of ice formation (white and clear) AIS
N North, North Latitude AIS
N1 Gas Generator Speed
N2 Second Stage Turbine Speed
NAA National Airworthiness Authority (for a country other than Australia) CAR 1998
NAD Non-acqueous Developer
NAIPS National aeronautical information processing system AIP
NANDTB National Aerospace Non-destructive Testing Board
NANU Notice Advisory to NavStar Users
NAP Noise Abatement Procedures AIS
NAS National Airspace System
NASC National AIS System Centre AIS
NASIG National Airspace System Implementation Group
NAV Navigation AIS
NAVAID Navigation Aid AIS
NAWD Non-acqueous Wet Developer
NB Northbound AIS
NBFR Not Before AIS
NC No Change AIS
NDB Non-directional Radio Beacon AIS
NDI Non-destructive inspection CAR 1988
NDT Non-destructive testing CAR 1988
NE Northeast AIS
NEG Negative, No. Permission not granted or, That is not correct AIS
NFRM Notice of Final Rule Making CASA
NG Gas Generator Speed
NM Nautical Miles AIS
NML Normal AIS
NNE North North-East AIS
NNW North North-West AIS
NOF International NOTAM Office AIS
NOSIG No Significant Change AIS
NOTAM Notice To Airmen AIP
NOV November AIS
NOZ Normal Operating Zone AIS
NP Propeller Speed
NPA Non-precision approach (procedures at aerodromes) AIS
NPC Notice of proposed change (consultation for amendment to a MOS) CAR 1998
NPRM Notice of proposed rule making CASA
NSC Nil Significant Cloud AIS
NTA No TAF Amendment AIS
NTL National AIS
NTS Negative Torque Sensing System
NTSB National Transportation Safety Board (of the USA)
NTZ No-transgression zone AIP/ICAO
NVD Night Vision Device
NVED Night Vision Enhancement Devices
NVET National vocational education and training CASR Part 66
NVFR Night Visual Flight Rules
NVG Night Vision Goggles (by the MIL) AIS
NVIS Night Vision Imaging Systems
NW North-West AIS
NZ New Zealand
NZ CAA New Zealand Civil Aviation Authority
NZS New Zealand Standard
O/R On Request
OAR Office of Airspace Regulation CASA
OAT Outside Air Transport
OAT Outside Air Temperature
OBPR Office of Best Practice Regulation
OBS Observe, Observed, Observation
OBS Omni Bearing Selector
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
OCT October
OCTA Outside Control Area AIS
OCTR Outside Control Zone
OEI One Engine Inoperative
OEM Original Equipment Manufacturer
OFZ Obstacle Free Zone
OHD Overhead
OHSMS Occupational Health and Safety Management Systems
OIS Obstacle Identification Surface
OLC Office of Legal Counsel
OLD Office of Legislative Drafting (replaced by OLDP) at the Attorney-General's Department
OLDI On-line Data Interchange
OLDP Office of Legislative Drafting and Publishing (previously OLD) at the Attorney-General's Department
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
ORR Office of Regulation Review (at the Productivity Commission)
ORS Online Response System - a CASA online form for consultation documents such as DPs, NPRMs, NPCs, draft ACs and draft CAAPs CASA
OSIP Overhaul and Special Inspections Periods
OT Other Times
OTAC Overseas Territories Aviation Circulars - developed by ASSI, a wholly-owned subsidiary of the UK Civil Aviation Authority. ASSI oversees aviation safety in the UK's overseas territories. Air Safety Support International (UK)
OTAR Overseas Territories Aviation Requirements - developed by ASSI, a wholly-owned subsidiary of the UK Civil Aviation Authority. ASSI oversees aviation safety in the UK's overseas territories. Air Safety Support International (UK)
OTLK Outlook (used in Sigmet messages for volcanic ash and tropical cyclones)
OTP On Top
OUBD Outboard
OVC Overcast
OW Over Water
P.. Prohibited Area (followed by identification) AIS
PA Precision Approach
PAL Pilot Activated Lighting AIS
PANS Procedures for Air Navigation Services AIS
PANS-OPS Procedures for Air Navigation Services - Aircraft Operations (ICAO Doc 8168 Vol I & II) ICAO
PAPI Precision Approach Path Indicator AIS
PAR Precision Approach Radar AIS
PARL Parallel AIS
PATC Precision Approach Terrain Chart (followed by name/title) AIS
PAX Passengers AIS
PBM Power Plant Build-Up Manual WATOG
PC Personal Computer
PCATD Personal Computer-based Aviation Training Device
PCD Proceed, Proceeding AIS
PCL Pilot Controlled Lighting AIS
PCN Pavement classification number ICAO/AIP
PCT Practical consolidation training CASR Part 66
PDC Pre-Departure Clearance AIS
PDO Product distribution organisation CASR Part 144
PDOP Positional Dilution of Precision
PDSE Pre-departure Service Check
PEC Pressure Error Correction AIS
PERM Permanent AIS
PFC Porous Friction Course AIS
PFR Preferred Route AIS
PH Public Holiday AIS
PIB Pre-flight information bulletin ICAO/AIP
PIC Pilot-in-command CAR 1988
PICUS Pilot-in-Command Under Supervision
PIFR Private IFR rating CAR 1988
PIREP Pilot Reports WATOG
PJE Parachute Jumping Exercise AIS
PL Ice Pellets AIS
PLET CASA's Personnel Licensing, Education and Training Group CASA
PLN Flight Plan AIS
PLVL Present Level AIS
PMP Primary Maintenance Process WATOG
PN Prior Notice Required AIS
PNR Point of No Return AIS
PO Dust Devils AIS
POB Persons on Board AIS
POH Pilot Operating Handbook
POSS Possible AIS
PPI Plan Position Indicator AIS
PPL Private Pilot Licence CAR 1988
PPR Prior Permission Required AIS
PPS Precise Positioning Service
PPSN Present Position AIS
PRD Prohibited, Restricted and Danger Areas AIS
PRFG Aerodrome Partially Covered by Fog (MET code) AIS
PRI Primary AIS
PRKG Parking AIS
PRM Precision Runway Monitoring AIS
PRM Precision runway monitoring AIP
PROB Probable, Probability AIS
PROC Procedure AIS
PROV Provisional AIS
PSG Passing AIS
PSN Position AIS
PSP Pierced Steel Plank AIS
PSR Primary Surveillance Radar AIS
PSYS Pressure System(s) AIS
PTBL Portable AIS
PTN Procedure Turn AIS
PTT Push To Talk
PVT Private AIS
QDM Magnetic Heading (zero wind) AIP
QDR Magnetic Bearing AIP
QEC Quick Engine Change Unit WATOG
QFE An altimeter set to QFE will read zero when the aircraft is on the runway
QMS Quality Management System
QNH Altimeter subscale setting to obtain elevation or altitude AIS
QTE True Bearing AIP
QTG Qualification test guide
QUAD Quadrant AIS
R Right (runway system identification) AIS
R.... Restricted Area (followed by number) AIS
R/T Radio Telephone
RA-Aus Recreational Aviation Australia (previously the AUF)
RAA Recreational Aviation Australia (previously the AUF)
RAAO Recreational Aviation Administrative Organisation
RAC Rules of the Air and Air Traffic Services AIS
RAD Radius AIS
RAeS Royal Aeronautical Society
RAFC Regional Area Forecast Centre AIS
RAG Ragged AIS
RAG Runway Arresting Gear AIS
RAI Runway Alignment Indicator AIS
RAIM Receiver Autonomous Integrity Monitoring AIS
RAM Repair and Maintenance
RAP Regulatory Advisory Panel
RAPAC Regional Airspace Users Advisory Committee
RAPIC Radar Picture (MET) AIS
RAS Radar Advisory Service AIS
RASC Regional AIS System Centre AIS
RAT RAM Air Turbine
RCA Reach Cruising Altitude, AIS
RCA Request For Corrective Action AIS
RCC Rescue Coordination Centre AIS
RCH Reach, Reaching AIS
RCL Runway Centre Line AIS
RCLL Runway Centre Line Lights AIS
RCLM Runway Centre Line Marking AIS
RDCP CASA's Regulatory Development Coordination Panel CASA
RDL Radial AIS
RDMB CASA's Regulatory Development Management Branch CASA
RE... Recent (used to qualify weather phenomena, eg RERA = recent rain) AIS
REC Receive, Receiver, Received AIS
REDL Runway Edge Lights AIS
REF Reference to... Refer to... AIS
REG Registration AIS
RENL Runway End Lights AIS
REP Report, Reported, Reporting, Reporting Point AIS
REQ Request, Requested AIS
RERTE Re-route AIS
RES Reserve Fuel AIS
RESA Runway end safety area ICAO/AIP
RESTR Restrictions AIS
REV Review AIS
RFACA Royal Federation of Aero Clubs of Australia
RFC Request for change
RFC Regional Forecasting Centre (Met) AIS
RFFS Rescue and Fire Fighting Services AIS
RFP Regulatory Framework Program (superceded by RRP) CASA
RH Radio Height AIS
RHC Right-hand Circuit AIS
RIF Reclearance in Flight AIS
RIFTO Restricted Instrument Flight Take-off
RIS Regulation Impact Statement ORR
RIS Radar information service AIP/ICAO
RL Report Leaving AIS
RLA Relay to AIS
RLLS Runway Lead-in Lighting AIS
RMIT Royal Melbourne Institute of Technology
RMK Remark(s) AIS
RMK Root Mean Square
RNAV Area navigation AIP
RNP Required navigation performance
RO Registered operator CASR Part 43
ROBEX Regional OPMET Bulletin Exchanges AIS
ROC Rate of Climb AIS
ROD Rate of Descent AIS
ROFOR Route Forecast (in aeronautical meteorological code) AIS
RPA Rules and practices for aerodromes CAR 1988
RPI Radar Position Indicator AIS
RPI Regulatory Performance Indicator CAR 1988
RPI Runway Point of Intercept AIS
RPL Recognition of prior learning CASR Part 66
RPM Revolutions Per Minute
RPT Regular public transport CAR 1988
RQ Require(d) AIS
RQMNTS Requirements AIS
RR Report Reaching AIS
RRM Routine Reportable Matters
RRP Regulatory Reform Programme (now closed) CASA
RRPI Regulatory Reform Programme Implementation (now closed) CASA
RSC Rescue Sub-Centre AIS
RSCD Runway Surface Condition AIS
RSP Responder Beacon AIS
RSR En route Surveillance Radar AIS
RSVP Regulatory Structure and Validation Project (superceded by RFP) CASA
RTB Return to Base
RTCA Radio Technical Commission for Aeronautics
RTF Radio Telephone AIS
RTHL Runway Threshold Light(s) AIS
RTIL Runway Threshold Identification Lights AIS
RTN Return, Returned, Returning AIS
RTO Rejected take-off AIP
RTO Registered training organisation CASR Part 147
RTS Return to Service AIS
RTZL Runway Touchdown Zone Light(s) AIS
RVR Runway visual range AIP/ICAO
RVSM Reduced Vertical Separation Minimum ICAO/CAR 1988
RWS Runway Strip AIS
RWY Runway AIS
S South, South Latitude AIS
S-I Straight-In AIP
S/B Service Bulletin WATOG
S/E Single-engine
SA Selective Availability
SA Situation Awareness
SAAA Sport Aircraft Association of Australia

SAL Supplementary Airline Licence AIS
SALR Saturated Adiabatic Lapse Rate
SALS Simple Approach Lighting System AIS
SAR Search and Rescue AIS
SARPs Standards and Recommended Practices (ICAO) ICAO
SARTIME Time search action required AIS
SARWATCH Search and Rescue Watch
SAT Saturday AIS
SATCOM Satellite Communication AIS
SB Southbound AIS
SBAS Satellite Based Augmentation System
SC Stratocumulus AIS
SCC Standards Consultative Council CASA
SCP Safety Critical Personnel
SCT Scattered (meteorological) AIS
SDBY Standby AIS
SDC Standard Departure Clearance AIS
SDR Service difficulty report CAR 1998
SE South East AIS
SEA Sea (used in connection with sea-surface temperature and state of the sea) AIS
SEACO Single engine aircraft only
SEC Seconds AIS
SECN Section AIS
SELCAL Selective Calling System AIS
SEP September AIS
SER Service, Servicing, Served AIS
SEV Severe (used eg to qualify icing and turbulence report) AIS
SFC Surface AIS
SFL Sequenced Flashing Lights AIS
SG Snow Grains AIS
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) AIS
SHF Super High Frequency (3,000 to 30,000 MHZ) AIS
SHP Shaft Horse Power
SID Standard instrument departure ICAO/AIP
SIF Selective Identification AIS
SIG Significant AIS
SIGMET Information concerning en route weather phenomena which may affect the safety of aircraft operations AIS
SIL Service Information Letter
SIMUL Simultaneous, or Simultaneously AIS
SKC Sky Clear AIS
SKED Schedule, Scheduled AIS
SL Service Letter
SLP Speed Limiting Point AIS
SLW Slow, Slowly AIS
SM Safety Manager
SMC Surface Movement Control AIS
SMR Surface Movement Radar AIS
SMS Safety management system CAR 1998
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 AIS
SOC Start of Climb AIS
SOE Schedule of experience CAR 1988
SOM (SoM) System of Maintenance CAR 1998
SOPS Standard Operating Procedures
SOR Summary of responses (to DP or NPRM) CASA
SOT Start of TORA (take-off) AIS
SP Single Pilot AIS
SPA Sport Aviation AIS
SPECI Aviation Special Weather (in aeronautical meteorological code) AIS
SPFIB Specific Preflight Information Bulletin AIS
SPOT Spotwind AIS
SPS Standard Positioning Service
SQ Squall AIS
SR Sunrise AIS
SRB Safety Review Board
SRD Standard Radar Departure AIS
SRG Short Range AIS
SRM Structural Repair Manual WATOG
SRR Search and Rescue Region AIS
SRY Secondary AIS
SS Sandstorm AIS
SS Sunset AIS
SSB Single Sideband AIS
SSCRO Senate Standing Committee on Regulations and Ordinances
SSE South South-East AIS
SSI Structural Significant Item WATOG
SSM System Schematics Manual WATOG
SSR Secondary Surveillance Radar AIS
SST Supersonic Transport AIS
SSW South South-West AIS
ST Stratus AIS
STA Straight in Approach AIS
STAR Standard Arrival Route AIP
STAR Standard instrumental arrival ICAO
STARs Standard terminal arrival routes
STC Supplemental Type Certificate CASR Part 21
STD Synthetic training device CASR Part 60
STD Standard AIS
STF Stratiform AIS
STN Station AIS
STNR Stationary AIS
STODA Supplementary Take-off Distance AIS
STOL Short Take-off and Landing AIS
STS Status AIS
STWL Stopway Light(s) AIS
SUBJ Subject to AIS
SUN Sunday AIS
SUP Supplement (AIP Supplement) AIS
SUPPS Regional Supplementary Procedures AIS
SVCBL Serviceable AIS
SVY Survey Operations AIS
SW South-West AIS
SWS Soft Wet Surface AIS
SWY Stopway AIS
T Temperature AIS
T-VASIS 'T'Visual Approach Slope Indicator System (pronounced 'TEE-VAR-SIS') AIS
TA Transition Altitude AIS
TA Traffic advisory ICAO/AIP
TAAATS The Australian Advanced Air Traffic System
TAAM Airservices Australia's Total Airspace Airport and Aerodrome Modeller AIS
TAC Terminal Area Chart AIS
TACAN Tactical Air Navigation Aid AIS
TAF Aerodrome Forecast AIS
TAF Terminal Area Forcast
TAIL Tailwind AIS
TAR Terminal Area Surveillance Area AIS
TAS True Airspeed AIS
TAT Terminal Area Thunderstorm Service (meteorological term) AIS
TAWS Terrain awareness and warning system CAO 20.18
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. CAO Part 20, Section 20.18, Issue 9
TAX Taxiing, Taxi AIS
TBA To be advised AIS
TBO Time Between Overhauls WATOG
TC Type Certificate CASR Part 21
TC Tropical Cyclone AIS
TC5 Technical Committee 5 - AME Licensing Committee established under RFP CASA
TCAC Tropical Cyclone Advisory Centre
TCAS Traffic alert and collision avoidance system ICAO
TCDS Type certificate data sheet CASR Part 21
TCH Threshold Crossing Height AIS
TCO Training and Checking Organisation
TCTA Trans-continental Control Area AIS
TCU Towering Cumulus (met) AIS
TDO Tornado AIS
TDZ Touchdown Zone AIS
TECR Technical Reason AIS
TEL Telephone AIS
TEM (Illustrated) Tool And Equipment Manual WATOG
TEM Threat and Error Management
TEMPO Temporary, Temporarily (meteorologically) AIS
TERPs Terminal and En-route procedures AIS
TFC Traffic AIS
TFR Terrain Following Radar (by the MIL) AIS
TGL Touch & Go Landing AIS
TGS Taxiing Guidance System AIS
THR Threshold AIS
THRU Through AIS
THU Thursday AIS
TIBA Traffic Information Broadcasts by Aircraft AIS
TIP Until Past (place) AIS
TIS Time in service
TKOF Take-off AIS
TLOF Touchdown and lift-off area ICAO
TLS Transponder Landing System
TLW Time Limited WIP (work in progress) AIS
TMA Terminal Control Area AIS
TMG Track Made Good
TNA Training Needs Analysis
TNA Turn Altitude AIS
TNH Turn Height AIS
TNS Transitional Surface AIS
TOC Top of Climb AIS
TODA Take-off distance available ICAO
TOP Cloud Top AIS
TORA Take-off run available ICAO
TOT Turbine Outlet Temperature
TP Turning Point AIS
TR Track AIS
TRA Temporary Reserved Airspace AIS
TRAN Transition AIS
TRANS Transmits, Transmitter AIS
Trike A manned, powered hang-glider
TRL Transition Level AIS
TROP Tropopause AIS
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) AIS
TSI Time Since Installation WATOG
TSO Technical Standard Order
TSO Time Since Overhaul WATOG
TTF Trend Type Forecast AIS
TTMRA Trans Tasman Mutual Recognition Agreement
TUE Tuesday AIS
TURB Turbulence AIS
TWR Aerodrome Control Tower, Aerodrome Control AIS
TWY Taxiway AIS
TWYL Taxiway Link AIS
TYP Type of Aircraft AIS
TYPH Typhoon AIS
U/S Unserviceable AIS
UAB Until Advised By AIS
UAV Unmanned aerial vehicles CASR Part 101
UDF UHF Direction Finding Stations AIS
UFIT Uncontrolled Flight Into Terrain
UFN Until Further Notice AIS
UHDT Unable Higher Due Traffic AIS
UHF Ultra High Frequency (300 to 3,000 MHZ) AIS
UIR Upper Flight Information Region AIS
UK United Kingdom
UL Upper Limits AIS
UNA Unable AIS
UNAP Unable to Approve AIS
UNICOM Universal Communications
UNL Unlimited AIS
UNLC Unlicensed AIS
UNREL Unreliable AIS
US United States
US FAR Federal Aviation Regulations (of the USA)
USA United States of America
UTA Upper Control Area AIS
UTC Coordinated Universal Time AIS
V Velocity
V1 Take-off Decision Speed
V2 Take-off Safety Speed (Applicable to Larger Multi-engine Aircraft)
VA Volcanic Ash AIS
VA Maximum Manoeuvring Speed
VAA-H Visual Approach Area - Helicopter
VAAC Volcanic Ash Advisory Centre
VAC Visual Approach Chart ( followed by name/title) AIS
VAL In Valleys AIS
VAR Magnetic Variation AIS
VASIS Visual Approach Slope Indicator System AIS
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 AIS
VCY Vicinity AIS
VDF VHF Direction Finding Station AIS
VEC Visual En-route Chart AIS
VER Vertical AIS
VFE Flap Extension Speed
VFR Visual flight rules
VHF Very High Frequency (30 to 300 MHZ) AIS
VHFCOM Very High Frequency Communications
VIA By way of... AIS
VIMD Maximum Drag Speed
VIP Very Important Person AIS
VIS Visibility AIS
VLE Maximum Speed with Landing Gear Extended
VLF Very Low Frequency (3 to 30 KHZ) AIS
VLJ Veryl Light Jet
VLO Landing Gear Operating
VLO2 Landing Gear Operation Down
VLR Very Long Range AIS
VMAN Visual Maneouvre Speed
VMC Visual Meteorological Conditions AIS
VMC Minimum Control Speed
VMCA Minimum Control Airspeed Airborne (Red line speed)
VMCG Minimum Control Airspeed on the Ground
VNAV Vertical Navigation
VNE Never Exceed Speed ICAO
VNO Maximum Structural Cruising Speed ICAO
VNO Normal Operating Speed
VOLMET Meteorological Information for Aircraft in Flight AIS
VOR VHF Omni-directional Radio Range (OMNI) AIS
VP Variable Pitch Propellers
VR The speed at which the aircraft is rotated to lift off from the runway
VRB Variable AIS
VSI Vertical Speed Indicator
VSI Clean Stall Speed
VSL Vertical speed limit ICAO
VSO Stalling speed, minimum steady flight speed in the landing configuration CAR 1998
VSO Stall speed with undercarriage and flap selected
VSSE Safe single-engine Speed
VTC Visual Terminal Chart AIS
VTOL Vertical take-off and landing ICAO
VTOSS Take-off Safely Speed
VX Best Angle of Climb Speed
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 AIS
W White AIS
W/V Wind Velocity
WAAS Wide Area Augmentation System
WAC World Aeronautical Chart ICAO 1:1,000,000 (followed by name/title) AIS
WAFC World Area Forecast Centre AIS
WAFS World Area Forecast System
WATIR Weather and Terminal Information Rectifier AIS
WATOG World Airlines Technical Operations Glossary
WB Westbound AIS
WBM Weight And Balance Manual WATOG
WDI Wind Direction Indicator AIS
WDSPR Widespread AIS
WED Wednesday AIS
WEF With Effect From, Effective From AIS
WGS-84 World Geodetic System 1984 AIS
WI Within AIS
WIE With Immediate Effect, Effective Immediately AIS
WILCO Will Comply AIS
WIND Wind (used in connection with direction and speed) WINTEM Forecast upper wind and temperature at specified points (in aeronautical met code) AIS
WIP Work in Progress AIS
WKN Weaken, Weakening AIS
WM Wiring Manual WATOG
WMO World Meteorological Organisation
WNW West North-West AIS
WO Without AIS
WPT Way-point AIS
WRNG Warning AIS
WS Wind Shear AIS
WSW West South-West AIS
WT Weight AIS
WTSPT Water Spout AIS
WWW World Wide Web AIS
WX Weather AIS
X Cross AIS
XBAR Crossbar (of approach lighting system) AIS
XNG Crossing AIS
XS Atmospherics AIS
XSEC Extra Section WATOG
Y Yellow AIS
YCZ Yellow Caution Zone AIS
YR Your/s AIS
Z Coordinated Universal Time (in meteorological messages) AIS