Microsoft Flight Simulator – Aviation Abbreviations and Acronyms

Microsoft Flight Simulator Aviation Abbreviations and Acronyms

Some useful aviation/meteorological acronyms for general guidance and use in the aviation industry.

Note: This guild is based on Australian data, hence few Aussie acronyms.

A

• A Amber
• A/A Air to air
• A/G Air-to-ground
• AAA Amended meterological message
• AAAA Aerial Application Association of Australia
• AAC Airworthiness Advisory Circular
• 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
• AAT Administrative Appeals Tribunal
• ABAA Amateur Built Aircraft Acceptance
• 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
• AC Altocumulus (met)
• ACA Australian Commonwealth Authority
• ACARS Aircraft communication addressing and reporting system (pronounced ‘AY-CARS’)
• ACAS Airborne Collision Avoidance System
• 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)
• ACK Acknowledge
• ACL Altimeter check location
• ACN Aircraft classification number
• ACN Australian company number
• ACPT Accept, accepted
• ACROB Acrobatics
• Act the Civil Aviation Act 1988
• ACT Active, activated, activity
• AD Aerodrome
• AD Airworthiness Directive
• ADA Advisory area
• ADAO Authorised Design Approval Organisation
• ADC Aerodrome chart
• ADDGM Aerodrome diagrams
• ADDN Addition, additional
• ADF Automatic Direction Finding (equipment)
• ADF Australian Defence Force
• ADIZ Air Defence Identification Zone
• ADJ Adjacent
• ADO Aerodrome office
• 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)
• ADS Automatic Dependent Surveillance
• ADS-B Automatic Dependent Surveillance – Broadcast
• ADS-C Automatic Dependent Surveillance – Contract
• ADSU Automatic Dependent Surveillance Unit
• ADZ Advise
• AEB CASA’s Airworthiness Engineering Branch
• AEP Aerodrome emergency plan
• AER Authorised Engineering Representative
• AERIS Automatic en route information service
• AFAP Australian Federation of Air Pilots
• AFCS Automatic flight control system
• AFIL Flight notification: – filed in the air, or – indicating the position at which ATS services will first be required
• AFIS Aerodrome flight information service
• AFM Aircraft Flight Manual
• AFM Yes, affirm, affirmative, that is correct
• AFRU Aerodrome Frequency Response Unit (also known as a “beepback” unit)
• AFS Aeronautical fixed service
• AFT After
• AFTN Aeronautical fixed telecommunication network
• AFZ Australian fishing zone(s)
• Ag Agriculture
• AGA Again
• AGD Attorney-General’s Department
• AGL Above Ground Level
• AH Artificial Horizon
• AH After hours
• AIC Aeronautical Information Circular
• AIDC Air traffic services inter-facitility data communications
• AIP Aeronautical Information Publication
• 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
• AIRC Aeronautical Information and Control
• AIREP Air-Report
• AIRMET Information in plain language concerning weather significant to light aircraft operations at or below 10,000FT
• AIS Aeronautical Information Service
• AL Approach Lights
• ALA Aircraft Landing Area
• ALA Aeroplane landing area
• ALA Alighting area
• 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
• ALS Approach Lighting System
• ALT Altitude
• ALTN Alternate, Alternating (light alternates in colour)
• ALTN Alternate (aerodrome)
• AMA Area minimum altitude
• AMC Acceptable Means of Compliance
• AMD Amend, Amended
• AMDT Amendment (AIP amendment)
• AME Aircraft Maintenance Engineer
• AMM Aircraft Maintenance Manual
• AMO Approved Maintenance Organisation
• AMP Aircraft Maintenance Program
• AMPA Authorised Maintenance Personnel Assessor
• AMRD Australian Maintenance Requirements Document
• AMS Aircraft Maintenance Specialist
• AMSA Australian Maritime Safety Authority
• AMSL Above Mean Sea Level
• AMSS Aeronautical mobile satellite service
• AMT Aircraft Maintenance Technician
• 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)
• ANO Air Navigation Order
• ANS Answer
• ANTA Australian National Training Authority
• ANVIS Aviator Night Vision Imaging Systems
• AO Air Operator
• AOC Air Operators Certificate
• AOC Aerodrome Obstacle Chart (followed by name/title)
• AOCM Air Operators Certification Manual
• AOD Alcohol and Other Drug
• AOG Aircraft On Ground
• 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
• APN Apron
• APP Approach Control
• APRX Approximate, Approximately
• APSG After Passing
• APU Auxillary power unit
• APV Approach with Vertical Guidance
• APV Approve, Approved, Approval
• AQZ Area QNH Zone
• ARC Area Chart
• ARFFS Aerodrome Rescue and Fire Fighting Service (sometimes referred to as RFFS)
• ARFL Aeroplane Reference Field Length
• ARFO Area Forecast
• ARH Aircraft Registration Holder
• ARM Airspace Risk Model
• ARM Aircraft Recovery Manual
• ARN Aviation Reference Number
• ARNG Arrange
• ARO Air traffic services reporting office
• AROC Aircraft radio operator certificate
• ARP Aerodrome reference point
• ARP Air-Report (message type designator)
• ARQ Automatic error correction
• ARR Arrive, Arrival
• ARS Special Air-Report (message type designator)
• ARST Arresting (specify (part of) aircraft arresting equipment)
• AS Altostratus (meteorological)
• AS Australian Standard
• ASA Australian Skydiving Association
• ASAC Australian Sports Aviation Confederation
• ASAP As Soon as Possible
• ASC Ascend to or ascending
• ASDA Accelerate-stop distance available
• ASE Airborne Support Equipment
• ASE Altimetry System Error
• 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
• ASR Area Surveillance Radar
• ASRA Australian Sport Rotorcraft Association
• ASSI Air Safety Support International- a wholly-owned subsidiary of the UK Civil Aviation Authority
• 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)
• ATA Actual Time of Arrival
• ATA Air Transport Association
• ATC Air Traffic Control (in general)
• ATD Actual Time of Departure
• ATE Automatic Test Equipment
• ATEL/ANAV Aeronautical Telecommunication and Radio Navigation Services
• ATFM Air Traffic Flow Management
• ATIS Automatic terminal information service
• ATM Air traffic management
• ATN Aeronautical telecommunications network
• ATO Aviation Testing Officer
• ATP At.. (time or place)
• ATPL Airline Transport Pilot Licence
• ATS Air Traffic Service(s)
• ATSB Australian Transport Safety Bureau
• ATSO Australian Technical Standard Order
• ATSOA Australian Technical Standard Order Authorisation
• ATTN Attention
• ATZ Aerodrome traffic zone
• 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)
• AWO Aerial work operation
• AWS Automatic Weather Station
• AWTA Advise as to wh

B

• B Blue
• BA Braking action
• BAK Basic aeronautical knowledge
• 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
• 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
• BVLOS Beyond visual line of sight

C

• C Degrees Celsius (Centigrade)
• C Centre (Runway)
• CA Course Acquisition
• CA/GRO Certified Air/Ground Radio Operator
• CA/GRS Certified Air/Ground Radio Service
• CAA NZ Civil Aviation Authority New Zealand
• CAAP Civil Aviation Advisory Publication
• CAGRO Certified Air Ground Radio Operation
• CAMO Continuing Airworthiness Management Organisation
• CAMP Continuous Airworthiness Maintenance Program
• CAO Civil Aviation Order
• CAR Civil Aviation Regulations 1988
• CAS Calibrated air speed
• CASA Civil Aviation Safety Authority
• CASR Civil Aviation Safety Regulations 1998
• CASR Civil Aviation Safety Regulation
• 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)
• CCF Capability Check Flight
• CCTS Circuits
• CD Candela
• CDCCL Critical Design Configuration Control Limit
• CDI Course Direction Indicator
• CDL Configuration Deviation List
• CDN Coordination (message type designator)
• CEN En Route and Area ATC unit
• CEO Chief Executive Officer
• CET Clearance Expiry Time
• CF Change Frequency to
• CFI Chief Flying Instructor
• CFIT Controlled Flight into Terrain
• CFL Cleared Flight Level
• CFM Confirm, I confirm
• CG Centre of gravity
• CGL Circling guidance light(s)
• 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)
• CHG Modification (message type designator)
• CHTR Charter
• CI Cirrus (met)
• CIDIN Common ICAO data interchange network
• CIR Command Instrument Rating
• 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
• 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)
• CofA Certificate of Airworthiness
• COM Communications
• CONC Concrete
• COND Condition
• CONS Continuous
• CONST Construction, Constructed
• CONT Continue(s), Continued
• COOR Coordinate, Coordinated
• COORD Coordinates
• COP Change over point
• CoR Certificate of Registration
• COR Correct, Corrected, Correction
• COS Conical Surface
• COT At the Coast, Coastal
• COV Cover, Covered, Covering
• CP Chief Pilot
• CPDLC Controller-Pilot Data Link Communication
• CPL Commercial Pilot Licence
• CPL Current flight plan
• CRC Cyclic redundancy check
• CRIS Cost Recovery Impact Statement
• CRM Crew Resource Management
• 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
• CTAF(R) Common Traffic Advisory Frequency – (Radio)
• CTAM Climb to and maintain
• CTC Category Technical Competency
• CTC Contact
• CTL Control
• CTN Caution
• CTR Control Zone
• CU Cumulus (met)
• CUF Cumuliform (met)
• CUST Customs
• CVR Cockpit voice recorder
• CW Carrier Wave
• CWY Clearway

D

• D Deleted
• D Downward (tendency in RVR (Runway visual range) during previous 10 minutes)
• 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
• DALR Dry Adiabatic Lapse Rate
• DAME Designated Aviation Medical Examiner
• DAO Designated Aviation Ophthamologist
• DAP Departure and Approach Procedures
• DCD Double channel duplex
• DCKG Docking
• DCMSD Decommissioned
• DCPC Direct Controller-Pilot Communications
• DCS Double channel simplex
• 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)
• DEC December
• DEG Degrees
• DEP Depart, Departure, Departed, Departing, Departure Message
• DER Departure End of Runway
• DER Designated Engineering Representative
• 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
• DGA Distance Measuring Equipment or Global Positioning Satellite System Arrival
• DH Decision Height
• DIF Diffuse
• DISP Displaced
• DIST Distance
• DIV Diversion, Divert, Diverting
• DLA Delay (message type designator)
• DLIC Data Link Initiation Capability
• DLY Daily
• DMC Direct Maintenance Cost
• DME Distance Measuring Equipment
• DMEN DME (International)
• DMEP DME (International Precision used in conjunction with Microwave Landing System)
• DNG Danger, Dangerous
• DOC Direct Operating Cost
• DOC Documents
• DoD Department of Defence
• DOM Domestic
• DP Dew Point Temperature
• DP Discussion Paper
• DPT Depth
• DR Dead Reckoning (navigation)
• DR… Low drifting (followed by DU=dust, SA=sand or SN=snow)
• DRG During
• DS Dust storm
• DSB Double sideband
• DTAM Descend to And Maintain
• DTG Date-Time Group
• DTHR Displaced Runway Threshold
• DTRT Deteriorate, Deteriorating
• DTW Dual tandem wheels
• DU Dust
• DUC Dense Upper Cloud (met)
• DUPE This is a duplicate message (to be used in Aeronautical Fixed Service as a procedure signal)
• DUR Duration
• DVOR Doppler VOR
• DW Dual wheels
• DZ Drizzle

E

• E East, East Longitude
• E E E Error (to be used in AFS as a procedure signal)
• EASA 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
• EGNOS European Geostationary Navigation Overlay System
• EGPWS Enhanced Ground Proximity Warning System
• EHF Extremely high frequency (30,000 to 300,000 MHz)
• EHR Encumbrance Holder Register
• ELBA Emergency locator beacon-aircraft
• ELEV Elevation
• ELR Extra Long Range
• ELT(S) Emergency Locator Transmitter (Survival)
• EM Engine Manual
• 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)
• 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
• ERC En-route Chart
• ERP Emergency Response Plan
• ERSA En-route Supplement Australia
• 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
• ETP Equi Time Interval
• ETT Estimated Time Interval
• EV Every
• EVLOS Extended visual line of sight
• EVU Enforceable Voluntary Undertaking
• EXC Except
• EXCO Executive Council
• EXER Exercises, Exercising, to exercise
• EXP Expect, Expected, Expecting
• EXTD Extend, Extending, Extended

F

• F Fixed (chart symbol)
• FAA Federal Aviation Administration of the USA
• FAAOC Foreign Aircraft Air Operator’s Certificate
• FAC Facility, Facilities
• FADEC Full Authority Digital Engine Control
• FAF Final Approach Fix
• FAL Facilitation of International Air
• FAP Final Approach Point
• FARs Federal Aviation Regulations (Federal Aviation Administration of the USA)
• FATO Final approach and take-off area
• 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
• 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
• FISA Flight information service (automated)
• FISS Flight Information Service Station
• FIX Fault Isolation Manual
• FL Flight Level
• FLD Field
• FLG Flashing
• FLIR Forward Looking Infra Red
• FLR Flares
• FLT Flight
• FLTCK Flight check
• 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
• FMU Flow Management Unit
• FNA Final Approach
• FNPT Flight and Navigation Procedures Trainer
• FOD Foreign Object Damage
• FOI Flying Operations Inspector
• FPD Flight Plan Designator
• FPL Filed Flight Plan Message
• FPM Feet per Minute
• FPR Flight Plan Route
• FPV First person view
• FR Fuel Remaining
• FREQ Frequency
• FRM Fault Reporting Manual
• FRMS Fatigue Risk Management System
• FRNG Firing
• FRONT Front (relating to weather)
• FRQ Frequent
• FS Flight Service (in general)
• FSA Flight Safety Australia
• FSL Full Stop Landing
• FSP Fish Spotting
• FSS Flight service station
• FST First
• FT Feet
• FTD Flight training device
• 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

• G Gravity
• G Green
• G/A Ground-to-air
• G/A/G Ground-to-air and air-to-ground
• GA Go ahead, resume sending (to be used in AFS as a procedure signal)
• GA General Aviation
• GAAP General Aviation Aerodrome Procedures
• GAMET Area forecast for low-level flights
• 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
• GP Guiding principles
• GP Glide Path
• 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)
• GRVL Gravel
• GS Groundspeed
• GS Small Hail and/or Snow Pellets
• GSE Ground Support Equipment
• GUND Geoid Undulation

H

• H24 Continuous day and night service
• HAA Height Above Aerodrome
• HAA Helicopter Association of Australia
• HAAMC Head of Aircraft Airworthiness and Maintenance Control
• HAM Head of Aircraft Maintenance
• HAMC Head of Aircraft Maintenance Control
• HAPI Helicopter approach path indicator
• HAT Height Above Threshold
• HBN Hazard Beacon
• HDF High frequency direction-finding station
• 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

I

• IA Inspection authorisation
• IAC Instrument approach chart (followed by name/title)
• IAF Initial Approach Fix
• 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
• IATA International Air Transport Association
• 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)
• ICAO International Civil Aviation Organization
• ICE Icing, Ice
• 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
• IG Implementation Group
• IGA International general aviation
• ILS Instrument Landing System
• IM Inner Marker
• IMC Instrument meteorological conditions (other than VMC)
• IMC Indirect Maintenance Cost
• IMG Immigration
• IMI Interrogation sign
• IMPR Improve, Improving, Improvement
• IMT Immediate, Immediately
• INA Initial approach
• INBD Inbound
• INC In Cloud
• INCERFA Uncertainty Phase
• INFO Information
• INOP Inoperative
• INP If not possible
• INPR In progress
• INS Inertial Navigation System
• 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
• IOE Initial Operational Experience
• IPC Illustrated Parts Catalogue
• IR Ice on runway
• IREX Instrument Training Examination
• IRM Immediately Reportable Matters
• IRS Internal Reporting System
• ISA International Standard Atmosphere
• ISB Independent Sideband
• ISIM Integrated Safety Investigation Methodology
• ISO9000 International Organization for Standardization
• ISOL Isolated
• ITT Interstage Turbine Temperature
• IWI Illuminated Wind Indicator
• IWP Intermediate Way-point

J

• 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

K

• 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

• 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
• LDA Landing distance available
• LDG Landing
• LDI Landing Direction Indicator
• LDP Landing decision point
• LEN Length
• LF Low Frequency (30 to 300 KHZ)
• 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
• LRNS Long-range navigation system
• LRU Line Replaceable Unit
• LSA Light Sport Aircraft
• LSALT Lowest safe altitude
• LSd CASA’s Legal Services Division
• LTD Limited
• LUL Lowest Usable Level
• LV Light and Variable (relating to wind)
• LVE Leave, Leaving
• LVL Level
• LYR Layer, Layered

M

• 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
• 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
• MCM Maintenance control manual
• MCQFS Manual of criteria for the qualification of flight simulators ICAO Doc 9625-AN/938
• MCUR Mean Cycles Between Unscheduled Removals
• MCW Modulated Continuous Wave
• MDA Minimum Descent Altitude
• MDF Medium Frequency Direction Finding Station
• MDR Major Defect Report
• MEA Minimum En-route Altitude
• MED Medical
• MEL Minimum equipment list
• MERSITAB Manufacturing, Engineering and Related Services Industry Training Advisory Body
• MET Meteorological, Meteorology
• MET REPORT Aviation routine weather report
• 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,
• 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).
• MON Above Mountains
• MOPS Minimum Operational Performance Standards
• MOS Manual of Standards
• MOU Memorandum of understanding
• MOV Move, Moved, Moving, Movement
• MOWP Method of Working Plan
• MPD Maintenance Planning Data
• MPI Magnetic Particle Inspection
• MPL Multi-crew Pilot Licence
• MPS Metres per Second
• MPT Magnetic Particle Inspection Technician
• MRB Maintenance Review Board
• MRBR Maintenance Review Board Report
• MRG Medium Range
• MRO Maintenance, repair and overhaul
• MRP ATS/MET Reporting Point
• MS Minus
• MSA Minimum sector altitude
• MSAS Multi-function Transport Satellite (MTSAT) Satellite-based Augmentation System
• MSDS Material Safety Data Sheets
• MSG Message
• MSG Maintenance Steering Group
• MSG-3 Maintenance Steering Group Logic Process
• MSI Maintenance Significant Item
• MSL Mean Sea Level
• MSOS Maintenance specific operation specification
• MSSR Monopulse Secondary Surveillance Radar
• MT Mountain
• MTBF Mean Time Between Failure
• MTBR Mean Time Between Removals
• MTBUR Mean Time Between Unscheduled Removals
• MTO Maintenance training organisation
• MTOW Maximum take-off weight
• MTP Maximum Tyre Pressure
• MTSAT Multi-function Transport Satellite
• MTTF Mean Time To Failure
• MTTR Mean Time To Repair
• MTTUR Mean Time To Unscheduled Removal
• MTUR Special Term For Data Transmittal
• MTW Mountain waves
• MVA Minimum Vector Altitude
• MWO Meteorological Watch Office
• MX Mixed type of ice formation (white and clear)

N

• 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
• NANDTB National Aerospace Non-destructive Testing Board
• NANU Notice Advisory to NavStar Users
• 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
• NFRM Notice of Final Rule Making
• NG Gas Generator Speed
• NGT Night
• 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
• 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
• NTA No TAF Amendment
• 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
• NVET National vocational education and training
• NVFR Night Visual Flight Rules
• NVG Night Vision Goggles (by the MIL)
• 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

• O/R On Request
• OAR Office of Airspace Regulation
• OAT Outside Air Transport
• OAT Outside Air Temperature
• OBPR Office of Best Practice Regulation
• 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
• 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
• OTAC Overseas Territories Aviation Circulars
• OTAR Overseas Territories Aviation Requirements
• OTLK Outlook (used in Sigmet messages for volcanic ash and tropical cyclones)
• OTP On Top
• OUBD Outboard
• OVC Overcast
• OW Over Water

P

• 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 ICAO Doc 8168 Vol I and II
• PAPI Precision Approach Path Indicator
• PAR Precision Approach Radar
• 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
• PCD Proceed, Proceeding
• PCL Pilot Controlled Lighting
• PCN Pavement classification number
• PCT Practical consolidation training
• PDC Pre-Departure Clearance
• PDO Product distribution organisation
• PDOP Positional Dilution of Precision
• PDSE Pre-departure Service Check
• 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
• PIFR Private IFR rating
• PILS Practice ILS
• PIREP Pilot Reports
• PJE Parachute Jumping Exercise
• PL Ice Pellets
• PLN Flight Plan
• PLVL Present Level
• PMP Primary Maintenance Process
• PN Prior Notice Required
• PNR Point of No Return
• 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
• 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
• 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

Q

• QDM Magnetic Heading (zero wind)
• QDR Magnetic Bearing
• QEC Quick Engine Change Unit
• 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
• QTE True Bearing
• QTG Qualification test guide
• QUAD Quadrant

R

• 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
• RDS Runway Distance Supplement
• RE… Recent (used to qualify weather phenomena, eg RERA = recent rain)
• REC Receive, Receiver, Received
• REDL Runway Edge Lights
• REF Reference to… Refer to…
• REG Registration
• RENL Runway End Lights
• ReOC PRPA operator’s certificate
• REP Report, Reported, Reporting, Reporting Point
• RePL Remote pilot licence
• REQ Request, Requested
• RERTE Re-route
• RES Reserve Fuel
• RESA Runway end safety area
• RESTR Restrictions
• REV Review
• 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
• RIF Reclearance in Flight
• RIFTO Restricted Instrument Flight Take-off
• RIS Regulation Impact Statement
• RIS Radar information service
• RL Report Leaving
• RLA Relay to
• 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
• ROBEX Regional OPMET Bulletin Exchanges
• ROC Rate of Climb
• ROD Rate of Descent
• ROFOR Route Forecast (in aeronautical meteorological code)
• RPA Remotely piloted aircraft
• RPA Rules and practices for aerodromes
• RPAS Remotely piloted aircraft system
• RPI Radar Position Indicator
• RPI Regulatory Performance Indicator
• RPI Runway Point of Intercept
• RPL Recognition of prior learning
• RPM Revolutions Per Minute
• RPS Remote pilot station
• RPT Regular public transport
• RQ Require(d)
• RQMNTS Requirements
• RR Report Reaching
• RRM Routine Reportable Matters
• RSC Rescue Sub-Centre
• RSCD Runway Surface Condition
• RSP Responder Beacon
• RSR En route Surveillance Radar
• RTB Return to Base
• RTCA Radio Technical Commission for Aeronautics
• 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
• RTZL Runway Touchdown Zone Light(s)
• RVR Runway visual range
• RVSM Reduced Vertical Separation Minimum
• RWS Runway Strip
• RWY Runway

S

• S South, South Latitude
• S-I Straight-In
• S/E Single-engine
• SA Sand
• 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
• SARTIME Time search action required
• SARWATCH Search and Rescue Watch
• 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)
• 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)
• 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
• 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
• SOC Start of Climb
• SOE Schedule of experience
• SOM (SoM) System of Maintenance
• SOPs Standard Operating Procedures
• SOR Summary of responses
• SOT Start of TORA (take-off)
• SP Single Pilot
• 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
• 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
• SST Supersonic Transport
• SSW South South-West
• ST Stratus
• STA Straight in Approach
• STAR Standard Arrival Route
• STAR Standard instrumental arrival
• STARs Standard terminal arrival routes
• STC Supplemental Type Certificate
• STD Synthetic training device
• STD Standard
• STF Stratiform
• 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

• 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
• 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
• TBA To be advised
• TBO Time Between Overhauls
• TC Type Certificate
• TC Tropical Cyclone
• TCAC Tropical Cyclone Advisory Centre
• TCAS Traffic alert and collision avoidance system
• TCDS Type certificate data sheet
• TCH Threshold Crossing Height
• TCO Training and Checking Organisation
• 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)
• 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)
• 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
• TOT Turbine Outlet Temperature
• TP Turning Point
• 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
• TTF Trend Type Forecast
• TTMRA Trans Tasman Mutual Recognition Agreement
• TURB Turbulence
• TWR Aerodrome Control Tower, Aerodrome Control
• TWY Taxiway
• TWYL Taxiway Link
• TYP Type of Aircraft
• TYPH Typhoon

U

• U/S Unserviceable
• UAB Until Advised By
• UAS Unmanned aerial system (UAV/RPAS)
• UAV Unmanned aerial vehicles
• UDF UHF Direction Finding Stations
• UFIT Uncontrolled Flight Into Terrain
• 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
• UOC Unmanned operating certificate
• US FAR Federal Aviation Regulations (of the USA)
• USA United States of America
• UTA Upper Control Area
• UTC Coordinated Universal Time

V

• 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
• VLOS Visual line of sight
• 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
• VOLMET Meteorological Information for Aircraft in Flight
• 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
• VSSE Safe single-engine Speed
• VTC Visual Terminal Chart
• VTOL Vertical take-off and landing
• 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

• W Watt
• W West, West Longitude
• W White
• W/V Wind Velocity
• WAAS Wide Area Augmentation System
• WAC World Aeronautical Chart ICAO 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
• 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
• WO Without
• WS Wind Shear
• WSW West South-West
• WT Weight
• WTSPT Water Spout
• WWW World Wide Web
• WX Weather

X

• X Cross
• XBAR Crossbar (of approach lighting system)
• XNG Crossing
• XS Atmospherics
• XSEC Extra Section

Y & Z

• Y Yellow
• YCZ Yellow Caution Zone
• YR Your/s

• Z Coordinated Universal Time (in meteorological messages)