The abbreviations used in this AIP and in the general dissemination of information are extracted from ICAO Doc 8400. Abbreviations which differ from the ICAO abbreviations are shown with an asterisk (*).
(+) - When radiotelephony is used, the abbreviations and terms are transmitted as spoken words
(++) - When radiotelephony is used, the abbreviations and terms are transmitted using the individual letters in non-phonetic form
(#) - Signal for use in the teletypewriter service only
| A - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| A | Amber |
| AAA | (or AAB, AAC...etc., in sequence) Amended meteorological message (message type designator) |
| A/A | Air-to-air |
| AAD | Assigned altitude deviation |
| AAR | Air to air refuelling |
| AAIM | Aircraft autonomous integrity monitoring |
| AAE | Arresting Gear |
| AAL | Above aerodrome level |
| AAR | Air-to-Air Refuelling |
| ABC | Advance Booking Charter Flight |
| ABI | Advance boundary information |
| ABM | Abeam |
| ABN | Aerodrome beacon |
| ABT | About |
| ABV | Above |
| AC | Altocumulus |
| ACARS | (to be pronounced “AY-CARS”) Aircraft communication addressing and Reporting system(+) |
| ACAS | Airborne collision avoidance system |
| ACC | Area control centre or area control(++) |
| ACCID | Notification of an aircraft accident |
| ACFT | Aircraft |
| ACK | Acknowledge |
| ACL | Altimeter check location |
| ACN | Aircraft classification number |
| ACP | Acceptance (message type designator) |
| ACPT | Accept or accepted |
| ACT | Active or activated or activity |
| AD | Aerodrome |
| ADA | Advisory area |
| ADC | Aerodrome chart |
| ADDN | Addition or additional |
| ADEP | Airport of Departure |
| ADES | Airport of Destination |
| ADEXP | ATS Data Exchange Presentation |
| ADF | Automatic direction-finding equipment(++) |
| ADIZ | (to be pronounced “AY-DIZ”) Air defence identification zone(+) |
| ADJ | Adjacent |
| ADO | Aerodrome office (specify service) |
| ADR | Advisory route |
| ADS | The address (when this abbreviation is used to request a repetition, the question mark (IMI) precedes the abbreviation, e.g. IMI ADS) (to be used in AFS as a procedure signal) |
| ADS-B | Automatic dependent surveillance - broadcast(++) |
| ADS-C | Automatic dependent surveillance - contract(++) |
| ADSU | Automatic dependent surveillance unit |
| ADVS | Advisory service |
| ADZ | Advise |
| AES | Aircraft earth station |
| AFIL | Flight plan filed in the air |
| AFIS | Aerodrome flight information service |
| AFM | Yes or affirm or affirmative or that is correct |
| AFS | Aeronautical fixed service |
| AFT | After... (time or place) |
| AFTN | Aeronautical fixed telecommunication network(++) |
| A/G | Air-to-ground |
| AGA | Aerodromes, air routes and ground aids |
| AGL | Above ground level |
| AGN | Again |
| AIC | Aeronautical information circular |
| AIDC | Air traffic services interfacility data communications |
| AIM | Aeronautical information management |
| AIM | ATFM Information Message |
| AIP | Aeronautical Information Publication |
| AIRAC | Aeronautical Information Regulation And Control |
| AIREP | Air-report(+) |
| AIRMET | Information concerning en-route weather phenomena which may affect the safety of low-level aircraft operations(+) |
| AIRPROX | Aircraft Proximity |
| AIS | Aeronautical Information Services |
| ALA | Alighting area |
| ALERFA | Alert phase(+) |
| ALR | Alerting (message type designator) |
| ALRS | Alerting service |
| ALS | Approach lighting system |
| ALSF | Approach Lighting System with Sequence Flashing Lights |
| ALT | Altitude |
| ALTN | Alternate or alternating (light alternates in colour) |
| ALTN | Alternate (aerodrome) |
| AMA | Area minimum altitude |
| AMC | Airspace Management Cell |
| AMD | Amend or amended (used to indicate amended meteorological message; message type designator) |
| AMDT | Amendment (AIP Amendment) |
| AMOS | Aerodrome Meteorological Observing System |
| AMS | Aeronautical mobile service |
| AMSL | Above mean sea level |
| AMSS | Aeronautical mobile satellite service |
| ANC | Aeronautical chart - 1:500 000 (followed by name/title) |
| ANCS | Aeronautical navigation chart - small scale (followed by name/title and scale) |
| ANM | ATFM Notification Message |
| ANP | Air Navigation Plan |
| ANS | Answer |
| AO | Aircraft Operator |
| AOC | Aerodrome obstacle chart (followed by type and name/title) |
| AP | Airport |
| APAPI | (to be pronounced “AY-PAPI”) Abbreviated precision approach path indicator(+) |
| APCH | Approach |
| APDC | Aircraft parking/docking chart (followed by name title) |
| APIS | Aircraft Parking and Information System |
| APN | Apron |
| APP | Approach control office or approach control or approach control service |
| APR | April |
| APRX | Approximate or approximately |
| APSG | After passing |
| APU | Auxiliary power unit |
| APV | Approach procedure with vertical guidance |
| ARC | Area chart |
| ARFOR | Area forecast (in aeronautical meteorological code) |
| ARNG | Arrange |
| ARO | Air traffic services reporting office |
| ARP | Aerodrome reference point |
| ARP | Air-report (message type designator) |
| ARQ | Automatic error correction |
| ARR | Arrival (message type designator) |
| ARR | Arrive or arrival |
| ARS | Special air-report (message type designator) |
| ARSA | Areas Requiring Special Attention |
| ARST | Arresting (specify (part of) aircraft arresting equipment) |
| ART | Article |
| AS | Altostratus |
| ASAP | As soon as possible |
| ASC | Ascend to or ascending to |
| ASDA | Accelerate-stop distance available |
| ASE | Altimetry system error |
| ASHTAM | Special series of NOTAM notifying, by means of a specific format, change in activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance to aircraft operations |
| ASPEEDG | Airspeed gain |
| ASPEEDL | Airspeed loss |
| ASPH | Asphalt |
| AT | At (followed by time at which weather change is forecast to occur) |
| ATA | Actual time of arrival(++) |
| ATC | Air traffic control (in general)(++) |
| ATCSMAC | Air traffic control surveillance minimum altitude chart (followed by name/title) |
| ATD | Actual time of departure(++) |
| ATFM | Air traffic flow management |
| ATIS | Automatic terminal information service(+) |
| ATM | Air traffic management |
| ATM | Automatic Teller Machine |
| ATN | Aeronautical telecommunication network |
| ATP | At... (time or place) |
| ATS | Air traffic services |
| ATTN | Attention |
| AT-VASIS | (to be pronounced “AY-TEE-VASIS”)(+) Abbreviated T visual approach slope indicator system |
| ATZ | Aerodrome traffic zone |
| AUG | August |
| AUP | Airspace use Plan |
| AUTH | Authorized or authorization |
| AUTO | Automatic |
| AUW | All up weight |
| AUX | Auxiliary |
| AVBL | Available or availability |
| AVG | Average |
| AVGAS | Aviation gasoline(+) |
| AWOS | Automated weather observation system |
| AWTA | Advise at what time able |
| AWY | Airway |
| AZM | Azimuth |
| B - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| B | Blue |
| BA | Braking action |
| BAK | Type of Arresting Gear |
| BARO-VNAV | Barometric vertical navigation (to be pronounced “BAA-RO-VEE-NAV“)(+) |
| BASE | Cloud base(+) |
| BCFG | Fog patches |
| BCN | Beacon (aeronautical ground light) |
| BCST | Broadcast |
| BCU | Bird Control Unit |
| BDRY | Boundary |
| BECMG | Becoming |
| BFR | Before |
| BIRDTAM | NOTAM Reporting Bird Hazard |
| BKN | Broken |
| BL | Blowing (followed by DU=dust, SA=sand or SN=snow) |
| BLDG | Building |
| BLO | Below clouds |
| BLW | Below... |
| BOMB | Bombing |
| BR | Mist |
| BRF | Short (used to indicate the type of approach desired or required) |
| BRG | Bearing |
| BRKG | Braking |
| B-RNAV | Basic Area Navigation |
| BS | Commercial broadcasting station |
| BTL | Between layers |
| BTN | Between |
| BUFR | Binary universal form for the representation of meteorological data |
| BYD | Beyond |
| C - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| C | Centre (runway identification) |
| C | Degrees Celsius (Centigrade) |
| C | Charts |
| CA | Course to an altitude |
| CAA | Civil aviation authority or civil aviation administration |
| CAR | Caribbean |
| CASA | Computer Assisted Slot Allocation |
| CAT | Category |
| CAT | Clear air turbulence |
| CAVOK | (to be pronounced “KAV-OH-KAY”) Visibility, cloud and present weather better than prescribed values or conditions(+) |
| CB | (to be pronounced “CEE BEE”) Cumulonimbus(++) |
| CBH | Cloud Base Height |
| CC | cirrocumulus |
| CCA | (or CCB, CCC... etc., in sequence) Corrected meteorological messages |
| CCO | Continuous climb operations |
| CD | Candela |
| CDN | Coordination (message type designator) |
| CDO | Continuous descent operations |
| CDR | Conditional Route |
| CEU | Central Executive Unit |
| CF | Change frequency to... |
| CF | Course to a fix |
| CFM | Confirm or I confirm (to be used in AFS as a procedure signal) |
| CGL | Circling guidance light(s) |
| CH | Channel |
| CH | This is a channel-continuity-check of transmission to permit comparison of your record of channel-sequence numbers of messages received on the channel (to be used in AFS as a procedure signal)(#) |
| CHCK | Chocks |
| CHEM | Chemical |
| CHG | Modification (message type designator) |
| CI | Cirrus |
| CIDIN | Common ICAO data interchange network(+) |
| CIV | Civil |
| CK | Check |
| CL | Centre line |
| CLA | Clear type of ice formation |
| CLBR | Calibration |
| CLD | Cloud |
| CLD | Clearance Delivery |
| CLG | Calling |
| CLIMB-OUT | Climb-out area |
| CLR | Clear(s) or cleared to... or clearance |
| CLRD | Runway(s) cleared (used in METAR/SPECI) |
| CLSD | Close or closed or closing |
| CM | Centimetre |
| CMB | Climb to or climbing to |
| CMPL | Completion or completed or complete |
| CNL | Cancel or cancelled |
| CNL | Flight plan cancellation (message type designator) |
| CNS | Communications, navigation and surveillance |
| CODE | ICAO Aircraft Address in form alphanumerical of six hexadecimal characters |
| COFA | Air Force Operational Command |
| COM | Communications |
| CONC | Concrete |
| COND | Condition |
| CONS | Continuous |
| CONST | Construction or constructed |
| CONT | Continue(s) or continued |
| COOR | Coordinate or coordination |
| COORD | Coordinates |
| COP | Change-over point |
| COR | Correct or correction or corrected (used to indicate corrected meteorological message; message type designator) |
| COT | At the coast |
| COV | Cover or covered or covering |
| CPDLC | Controller-pilot data link communications(++) |
| CPL | Current flight plan (message type designator) |
| CR | Cross Sections |
| CRAM | Conditional Route Availability Message |
| CRC | Cyclic redundancy check |
| CRC | Control and Reporting Centre |
| CRM | Collision risk model |
| CRP | Compulsory reporting point |
| CRZ | Cruise |
| CS | Call sign |
| CS | Cirrostratus |
| CSF | Communication Support Facility |
| CTA | Control area |
| CTAM | Climb to and maintain |
| CTC | Contact |
| CTL | Control |
| CTN | Caution |
| CTOT | Calculated Take-off Time |
| CTR | Control zone |
| CU | Cumulus |
| CUF | Cumuliform |
| CUST | Customs |
| CVR | Cockpit voice recorder |
| CW | Continuous wave |
| CWY | Clearway |
| D - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| D | Downward (tendency in RVR during previous 10 minutes) |
| D | Danger area (followed by identification) |
| DA | Decision altitude |
| DAT | Data Link |
| D-ATIS | (to be pronounced “DEE-ATIS”) Data link automatic terminal information service(+) |
| DCD | Double channel duplex |
| DCKG | Docking |
| DCL | Clearance Delivery Service |
| DCP | Datum crossing point |
| DCPC | Direct controller-pilot communications |
| DCS | Double channel simplex |
| DCT | Direct (in relation to flight plan clearances and type of approach) |
| DE | From (used to precede the call sign of the calling station) (to be used in AFS as a procedure signal) |
| DEC | December |
| DEG | Degrees |
| DEP | Depart or departure |
| DEP | Departure (message type designator) |
| DEPO | Deposition |
| DER | Departure End of the Runway |
| DES | Descend to or descending to |
| DEST | Destination |
| DETRESFA | Distress phase(+) |
| DEV | Deviation or deviating |
| DF | Direction finding |
| DFDR | Digital flight data recorder |
| DFTI | Distance from touchdown indicator |
| DGS | Docking Guidance System |
| DH | Decision height |
| DIF | Diffuse |
| DIST | Distance |
| DIV | Divert or diverting |
| DLA | Delay or delayed |
| DLA | Delay (message type designator) |
| DLIC | Data link initiation capability |
| DLY | Daily |
| DME | Distance measuring equipment(++) |
| DNG | Danger or dangerous |
| DOC | Document |
| DOF | Date of Flight |
| DOM | Domestic |
| DP | Dew point temperature |
| DPT | Depth |
| DR | Dead reckoning |
| DR | Low drifting (followed by DU=dust, SA=sand or SN=snow) |
| DRG | During |
| DS | Duststorm |
| DSB | Double sideband |
| DTAM | Descend to and maintain |
| DTG | Date-time group |
| DTHR | Displaced runway threshold |
| DTRT | Deteriorate or deteriorating |
| DTW | Dual tandem wheels |
| DU | Dust |
| DUC | Dense upper cloud |
| DUPE | This is a duplicate message (to be used in AFS as a procedure signal)(#) |
| DUR | Duration |
| D-VOLMET | Data link VOLMET |
| DVOR | Doppler VOR |
| DVORTAC | DVOR and TACAN Combination |
| DW | Dual wheels |
| DZ | Drizzle |
| E - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| E | East or eastern longitude |
| eAIP | Electronic Aeronautical Information Publication |
| EAD | European AIS Database |
| EAT | Expected approach time |
| EB | Eastbound |
| EC | European Community |
| ECAC | European Civil Aviation Conference |
| EDA | Elevation differential area |
| EDTO | Extended diversion time operations |
| EEE | Error (to be used in AFS as a procedure signal)(#) |
| EET | Estimated elapsed time |
| EFC | Expect further clearance |
| EFIS | (to be pronounced “EE-FIS”) Electronic flight instrument system(+) |
| EGNOS | (to be pronounced “EGG-NOS) European geostationary navigation overlay service(+) |
| EHF | Extremely high frequency (30 000 to 300 000 MHz) |
| EFIS | Electronic flight instrument system (to be pronounced “EE-FIS”)(+) |
| ELBA | Emergency location beacon - aircraft(+) |
| ELEV | Elevation |
| ELR | Extra long range |
| ELT | Emergency locator transmitter |
| EM | Emission |
| EMBD | Embedded in a layer (to indicate cumulonimbus embedded in layers of other clouds) |
| EMERG | Emergency |
| EN | English |
| END | Stop-end (related to RVR) |
| ENE | East-north-east |
| ENG | Engine |
| ENR | En route |
| ENRC | Enroute chart (followed by name/title) |
| EOBT | Estimated off-block time |
| EPNdB | Effective perceived noise in decibels |
| EQPT | Equipment |
| ESE | East-south-east |
| EST | Estimate or estimated or estimation (message type designator) |
| ETA | Estimated time of arrival or estimating arrival(++) |
| ETD | Estimated time of departure or estimating departure |
| ETFMS | Enhanced Tactical Flow Management System |
| ETO | Estimated time over significant point |
| ETOT | Estimated Take-off Time |
| EU | European Union |
| EUR | European Region |
| EUR RODEX | European regional OPMET data exchange |
| EV | Every |
| EVS | Enhanced vision system |
| EXC | Except |
| EXCL | Excluded |
| EXER | Exercises or exercising or to exercise |
| EXP | Expect or expected or expecting |
| EXT | Extension |
| EXTD | Extend or extending or extended |
| F - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| F | Fixed |
| FA | Course from a fix to an altitude |
| FAC | Facilities |
| FAF | Final approach fix |
| FAL | Facilitation of international air transport |
| FAM | Flight Activation Monitoring |
| FANS | Future Air Navigation Systems |
| FAP | Final approach point |
| FAS | Final approach segment |
| FATO | Final approach and take-off area |
| FAX | Facsimile transmission |
| FBL | Light (used to indicate the intensity of weather phenomena, interference or static reports, e.g. FBL RA = light rain) |
| FC | Funnel cloud (tornado or water spout) |
| FCST | Forecast |
| FCT | Friction coefficient |
| FDPS | Flight data processing system |
| FEB | February |
| FEW | Few |
| FFS | Fire Fighting Service |
| FG | Fog |
| FIC | Flight information centre |
| FIR | Flight information region(++) |
| FIS | Flight information service |
| FISA | Automated flight information service |
| FL | Flight level |
| FLD | Field |
| FLG | Flashing |
| FLR | Flares |
| FLS | Flight Suspension Message |
| FLT | Flight |
| FLTCK | Flight check |
| FLUC | Fluctuating or fluctuation or fluctuated |
| FLW | Follow(s) or following |
| FLY | Fly or flying |
| FM | Modulated Frequency |
| FM | From |
| FM | From (followed by time weather change is forecast to begin) |
| FM | Course from a fix to manual termination (used in navigation database coding) |
| FMC | Flight management computer |
| FMD | Former NM Flow Management Division |
| FMP | Flow Management Position |
| FMS | Flight management system(++) |
| FMU | Flow management unit |
| FNA | Final approach |
| FPAP | Flight path alignment point |
| FPL | Flight plan |
| FPM | Feet per minute |
| FPR | Flight plan route |
| FR | Fuel remaining |
| FRA | Free route airspace(*) |
| FREQ | Frequency |
| FRI | Friday |
| FRNG | Firing |
| FRONT | Front (relating to weather)(+) |
| FROST | Frost (used in aerodrome warnings)(+) |
| FRQ | Frequent |
| FSL | Full stop landing |
| FSS | Flight service station |
| FST | First |
| FT | Feet (dimensional unit) |
| FTE | Flight technical error |
| FTP | Fictitious threshold point |
| FTT | Flight technical tolerance |
| FU | Smoke |
| FZ | Freezing |
| FZDZ | Freezing drizzle |
| FZFG | Freezing fog |
| FZRA | Freezing rain |
| G - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| G | Green |
| G | Variations from the mean wind speed (gusts) (followed by figures in METAR/SPECI and TAF) |
| GA | General aviation |
| GA | Go ahead, resume sending (to be used in AFS as a procedure signal) |
| G/A | Ground-to-air |
| G/A/G | Ground-to-air and air-to-ground |
| GAGAN | GPS and geostationary earth orbit augmented navigation(+) |
| GAIN | Airspeed or headwind gain |
| GAMET | Area forecast for low-level flights |
| GARP | GBAS azimuth reference point |
| GBAS | (to be pronounced “GEE-BAS”) Ground-based augmentation system(+) |
| GAT | General Air Traffic |
| GCA | Ground controlled approach system or ground controlled approach(++) |
| GEN | General |
| GEO | Geographic or true |
| GES | Ground earth station |
| GLD | Glider |
| GLONASS | (to be pronounced “GLO-NAS”) Global orbiting navigation satellite system(++) |
| GLS | GBAS landing system (++) |
| GMC | Ground movement chart (followed by name/title) |
| GND | Ground |
| GNDCK | Ground check |
| GNSS | Global navigation satellite system(++) |
| GOV | Government |
| GP | Glide path |
| GPA | Glide path angle |
| GPIP | Glide path intercept point |
| GPS | Global positioning system(++) |
| GPU | Ground power unit |
| GPWS | Ground proximity warning system(++) |
| GR | Hail |
| GRASS | (to be pronounced “GRASS”) Ground-based regional augmentation system(+) |
| GRASS | Grass landing area |
| GRIB | Processed meteorological data in the form of grid point values expressed in binary form (in meteorological code) |
| GRVL | Gravel |
| GS | Ground speed |
| GS | Small hail and/or snow pellets |
| GUND | Geoid undulation |
| H - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| H | High pressure area or the centre of high pressure |
| H | Hour |
| H | Height |
| H... | Significant wave height (followed by figures in METAR/SPECI) |
| H24 | Continuous day and night service |
| HA | Holding/racetrack to an altitude |
| HAPI | Helicopter approach path indicator |
| HBN | Hazard beacon |
| HCH | Heliport crossing height |
| HDF | High frequency direction-finding station |
| HDG | Heading |
| HEL | Helicopter |
| HEMS | Hospital Emergency Medical Service |
| HF | High frequency [3 000 to 30 000 kHz](++) |
| HF | Holding/racetrack to a fix |
| HGT | Height or height above |
| HIRO | High Intensity Runway Operation |
| HJ | Sunrise to sunset |
| HLDG | Holding |
| HLP | Heliport |
| HLS | Heliport landing site |
| HM | Holding/racetrack to a manual termination |
| HN | Sunset to sunrise |
| HO | Service available to meet operational requirements |
| HOL | Holiday |
| HOSP | Hospital aircraft |
| HPA | Hectopascal |
| HQ | Headquarters |
| HR | Hours |
| HS | Service available during hours of scheduled operations |
| HT | High Tension |
| HTA | Helicopter Training Area |
| HUD | Head-up display |
| HUM | Humanitarian |
| 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 weather phenomena,e.g. HVY RA = heavy rain) |
| HX | No specific working hours |
| HYR | Higher |
| HZ | Haze |
| HZ | Hertz (cycle per second) |
| I - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| IAC | Instrument approach chart (followed by name/title) |
| IAF | Initial approach fix |
| IAO | In and out of clouds |
| IAP | Instrument approach procedure |
| IAR | Intersection of air routes |
| IAS | Indicated airspeed |
| IATA | International Air Transport Association |
| IBN | Identification beacon |
| ICAO | International Civil Aviation Organization |
| ICD | Interface Control Document |
| ICE | Icing |
| ID | Identifier or identify |
| IDENT | Identification(+) |
| IF | Intermediate approach fix |
| IFF | Identification friend/foe |
| IFPS | Integrated Initial Flight Plan Processing System |
| IFPU | Integrated Initial Flight Plan Processing Unit |
| IFPZ | IFPS Zone |
| IFR | Instrument flight rules(++) |
| IGA | International general aviation |
| ILS | Instrument landing system(++) |
| IM | Inner marker |
| IMC | Instrument meteorological conditions(++) |
| IMG | Immigration |
| IMI | Interrogation sign (question mark) (to be used in AFS as a procedure signal) |
| IMPR | Improve or improving |
| IMT | Immediate or immediately |
| INA | Initial approach |
| INBD | Inbound |
| INC | In cloud |
| INCERFA | Uncertainty phase(+) |
| IND | Indicator |
| INCORP | Incorporated |
| INFO | Information(+) |
| INOP | Inoperative |
| INP | If not possible |
| INPR | In progress |
| INS | Inertial navigation system |
| INSTL | Install or installed or installation |
| INSTR | Instrument |
| INT | Intersection |
| INTL | International |
| INTRG | Interrogator |
| INTRP | Interrupt or interruption or interrupted |
| INTSF | Intensify or intensifying |
| INTST | Intensity |
| IR | Ice on runway |
| IRS | Inertial reference system |
| ISA | International standard atmosphere |
| ISB | Independent sideband |
| ISOL | Isolated |
| ITC | Inclusive Tour Charter Flight |
| J - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| JAA | Joint Aviation Authorities |
| JAN | January |
| JET | Jet |
| JTST | Jet stream |
| JUL | July |
| JUN | June |
| K - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| KG | Kilograms |
| KHZ | Kilohertz |
| KIAS | Knots indicated airspeed |
| KM | Kilometres |
| KMH | Kilometres per hour |
| KPA | Kilopascal |
| KT | Knots |
| KW | Kilowatts |
| L - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| L | Left (preceded by runway designation number to identify a parallel runway) |
| L | Litre |
| L | Locator |
| L | Low pressure area or the centre of low pressure |
| LAM | Logical acknowledgement (message type designator) |
| LAN | Inland |
| LAT | Latitude |
| LB | Pounds (Weight) |
| LCA | Local or locally or location or located |
| LCN | Load classification number |
| LDA | Landing distance available |
| LDAH | Landing distance available, helicopter |
| LDG | Landing |
| LDI | Landing direction indicator |
| LEN | Length |
| LF | Low frequency (30 to 300 KHz) |
| LGT | Light or lighting |
| LGTD | Lighted |
| LIH | Light intensity high |
| LIL | Light intensity low |
| LIM | Light intensity medium |
| LINE | Line (used in SIGMET) |
| LM | Locator, middle |
| LMT | Local mean time |
| LNAV | Lateral navigation (to be pronounced “EL-NAV”)(+) |
| LNG | Long (used to indicate the type of approach desired or required) |
| LO | Locator, outer |
| LOC | Localizer |
| LONG | Longitude |
| LORAN | LORAN (long range air navigation system)(+) |
| LOSS | Airspeed or headwind loss |
| LPV | Localizer performance with vertical guidance |
| LR | The last message received by me was... (to be used in AFS as a procedure signal) |
| LRG | Long range |
| LS | Last message sent by me, was...or Last message was... (to be used in AFS as a procedure signal) |
| LTA | Lower control area |
| LTD | Limited |
| LTP | Landing threshold point |
| LV | Light and variable (relating to wind) |
| LVE | Leave or leaving |
| LVL | Level |
| LVP | Low Visibility Procedures |
| LVO | Low Visibility Operation |
| LYR | Layer or layered |
| M - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| M | Mach number (followed by figures) |
| M | Metres (preceded by figures) |
| M | Minimum value of runway visual range (followed by figures in METAR/SPECI) |
| MAA | Maximum authorized altitude |
| MAG | Magnetic |
| MAHF | Missed approach holding fix |
| MAINT | Maintenance |
| MALS | Medium Intensity Approach Lighting System |
| MAP | Aeronautical maps and charts |
| MAPT | Missed approach point |
| MAR | At sea |
| MAR | March |
| MATF | Missed approach turning fix |
| MATZ | Military aerodrome traffic zone |
| MAX | Maximum |
| MAY | May |
| MBST | Microburst |
| MCA | Minimum crossing altitude |
| MCTA | Military control area |
| MCTR | Military control zone |
| MCW | Modulated continuous wave |
| MDA | Minimum descent altitude |
| MDF | Medium frequency direction-finding station |
| MDH | Minimum descent height |
| MEA | Minimum en-route altitude |
| MEDEVAC | Medical evacuation flight |
| MEHT | Minimum eye height over threshold (for visual approach slope indicator systems) |
| MET | Meteorological or meteorology(+) |
| METAR | Aerodrome routine meteorological report (in meteorological code)(+) |
| MET REPORT | Local routine meteorological report (in abbreviated plain language) |
| MF | Medium frequency (300 to 3 000 khz) |
| MHA | Minimum holding altitude |
| MHDF | Medium and high frequency direction-finding stations (at the same location) |
| MHVDF | Medium, high and very high frequency direction-finding stations (at the same location) |
| MHZ | Megahertz |
| MID | Mid-point (related to RVR) |
| MIFG | Shallow fog |
| MIL | Military |
| MIN | Minutes |
| MIPS | Military Instrument Procedures |
| MIS | Miscellaneous |
| MIS | Missing... (transmission identification) (to be used in AFS as a procedure signal) |
| MKR | Marker radio beacon |
| MLS | Microwave landing system(++) |
| MM | Middle marker |
| MNM | Minimum |
| MNPS | Minimum navigation performance specifications |
| MNT | Monitor or monitoring or monitored |
| MNTN | Maintain |
| MOA | Military operating area |
| MOC | Minimum obstacle clearance (required) |
| MOCA | Minimum obstacle clearance altitude |
| MOD | Moderate (used to indicate the intensity of weather phenomena, interference or stactic reports, e.g. MODRA=moderate rain) |
| MON | Above mountains |
| MON | Monday |
| MOPS | Minimum operational performance standards(+) |
| MOTNE | Meteorological Operational Telecommunications Network Europe |
| MOV | Move or moving or movement |
| MPH | Statute Miles per Hour |
| MPS | Metres per second |
| MRA | Minimum reception altitude |
| MRG | Medium range |
| MRP | ATS/MET reporting point |
| MS | Minus |
| MSA | Minimum sector altitude |
| MSAS | (to be pronounced “EM-SAS”) Multi-functional transport satellite (MTSAT) satellite-based augmentation system(+) |
| MSAW | Minimum Safe Altitude Warning |
| MSG | Message |
| MSL | Mean sea level |
| MSR | Message... (transmission identification) has been misrouted (to be used in AFS as a procedure signal)(#) |
| MSSR | Monopulse secondary surveillance radar |
| MT | Mountain |
| MTOM | Maximum take-off mass |
| MTOW | Maximum Take-off Weight |
| MTU | Metric units |
| MTW | Mountain waves |
| MVDF | Medium and very high frequency direction- finding stations (at the same location) |
| MWO | Meteorological watch office |
| MX | Mixed type of ice formation (white and clear) |
| N - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| N | No distinct tendency (in RVR during previous 10 minutes) |
| N | North or northern latitude |
| NADP | Noise abatement departure procedure |
| NASC | National AIS system centre(+) |
| NAT | North Atlantic |
| NATSPG | North Atlantic Systems Planning Group |
| NAV | Navigation |
| NAVAID | Navigation aid |
| NB | Northbound |
| NBFR | Not before |
| NC | No change |
| NCD | No cloud detected (used in automated METAR/SPECI) |
| NDB | Non-directional radio beacon(++) |
| NDV | No directional variations available (used in automated METAR/SPECI) |
| NE | North-east |
| NEB | North-eastbound |
| NEG | No or negative or permission not granted or that is not correct |
| NGT | Night |
| NIL | None or I have nothing to send to you(+) |
| NM | Network Manager |
| NM | Nautical miles |
| NML | Normal |
| NN | No name, unnamed |
| NNE | North-north-east |
| NNW | North-north-west |
| NO | No (negative) (to be used in AFS as a procedure signal) |
| NOF | International NOTAM office |
| NONSTD | Non-standard |
| NOSIG | No significant change (used in trend-type landing forecasts)(+) |
| NOTAM | Notice distributed by means of telecommunication containing information concerning the establishment, condition or change in any aeronautical facility, service, procedure or hazard, the timely knowledge of which is essential to personnel concerned with flight operations(+) |
| NOTAMC | Cancelling NOTAM |
| NOTAMN | New NOTAM |
| NOTAMR | Replacing NOTAM |
| NOV | November |
| NOZ | Normal operating zone(++) |
| NPA | Non-precision approach |
| NR | Number |
| NRH | No reply heard |
| NS | Nimbostratus |
| NS | Non-schedule |
| NSC | Nil significant cloud |
| NSE | Navigation system error |
| NSW | Nil significant weather |
| NTL | National |
| NTZ | No transgression zone(++) |
| NVO | Normal Visibility Operations |
| NW | North-west |
| NWB | North-westbound |
| NXT | Next |
| O - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| OAC | Oceanic area control centre |
| OAS | Obstacle assessment surface |
| OBS | Observe or observed or observation |
| OBSC | Obscure or obscured or obscuring |
| OBST | Obstacle |
| OCA | Obstacle clearance altitude |
| OCA | Oceanic control area |
| OCC | Occulting (light) |
| OCH | Obstacle clearance height |
| OCL | Obstacle clearance limit |
| OCNL | Occasional or occasionally |
| OCS | Obstacle clearance surface |
| OCT | October |
| OFZ | Obstacle free zone |
| OGN | Originate (to be used in AFS as a procedure signal) |
| OHD | Overhead |
| OIS | Obstacle identification surface |
| OK | We agree or lt is correct (to be used in AFS as a procedure signal) |
| OLDI | On-line data interchange(+) |
| OM | Outer marker |
| OPA | Opaque, white type of ice formation |
| OPC | Control indicated is operational control |
| OPMET | Operational meteorological (information)(+) |
| OPN | Open or opening or opened |
| OPR | Operator or operate or operative or operating or operational |
| OPS | Operations(+) |
| OPSD | NM Operations Division |
| O/R | On request |
| ORD | Order |
| OSV | Ocean station vessel |
| OTLK | Outlook (used in SIGMET messages for volcanic ash and tropical cyclones) |
| OTP | On top |
| OTR | Other |
| OTS | Organized track system |
| OUBD | Outbound |
| OVC | Overcast |
| P - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| P | Prognostic upper air chart |
| P | Maximum value of wind speed or runway visual range (followed by figures in METAR/SPECI and TAF) |
| P | Prohibited area (followed by identification) |
| PA | Precision approach |
| PALS | Precision approach lighting system (specify category) |
| PANS | Procedures for air navigation services |
| PAPI | Precision approach path indicator(+) |
| PAR | Precision approach radar(++) |
| PARL | Parallel |
| PATC | Precision approach terrain chart (followed by name/title) |
| PAX | Passenger(s) |
| PBC | Performance-based communication |
| PBN | Performance-based navigation |
| PBS | Performance-based surveillance |
| PCD | Proceed or proceeding |
| PCL | Pilot-controlled lighting |
| PCN | Pavement classification number |
| PCT | Per cent |
| PDC | Pre-departure clearance(++) |
| PDG | Procedure design gradient |
| PDUS | Primary Data User Station |
| PER | Performance |
| PERM | Permanent |
| PIB | Pre-flight information bulletin |
| PJE | Parachute jumping exercise |
| PL | Ice pellets |
| PLA | Practice low approach |
| PLVL | Present level |
| PN | Prior notice required |
| PNR | Point of no return |
| PO | Dust/sand whirls (dust devils) |
| POB | Persons on board |
| POS | Position Report |
| POSS | Possible |
| PPI | Plan position indicator |
| PPR | Prior permission required |
| PPSN | Present position |
| PRFG | Aerodrome partially covered by fog |
| PRI | Primary |
| PRKG | Parking |
| PROB | Probability(+) |
| PROC | Procedure |
| PROP | Propeller |
| PROV | Provisional |
| PRP | Point-in-space reference point |
| PS | Plus |
| PSG | Passing |
| PSN | Position |
| PSP | Pierced steel plank |
| PSR | Primary surveillance radar(++) |
| PSYS | Pressure system(s) |
| PT | Portuguese |
| PTN | Procedure turn |
| PTS | Polar track structure |
| PWR | Power |
| Q - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| QDL | Do you intend to ask me for a series of bearings? or I intend to ask you for a series of bearings (to be used in radiotelegraphy as a Q Code) |
| QDM | Magnetic heading (zero wind)(++) |
| QDR | Magnetic bearing |
| QFE | Atmospheric pressure at aerodrome elevation (or at runway threshold)(++) |
| QFU | Magnetic orientation of runway |
| QGE | What is my distance to your station? or Your distance to my station is (distance figures and units) (to be used in radiotelegraphy as a Q Code) |
| QJH | Shall I run my test tape/a test sentence? or Run your test tape/a test sentence (to be used in AFS as a Q Code) |
| QNH | Altimeter sub-scale setting to obtain elevation when on the ground(++) |
| QSP | Will you relay to... free of charge? or I will relay to... free of charge (to be used in AFS as a Q Code) |
| QTA | Shall I cancel telegram number...? or Cancel telegram number... (to be used in AFS as a Q Code) |
| QTE | True bearing |
| QTF | Will you give me the position of my station according to the bearings taken by the D/F stations which you control? or The position of your station according to the bearings taken by the DIF stations that I control was... latitude... longitude (or other indication of position), class... at... hours (to be used in radiotelegraphy as a Q Code) |
| QUAD | Quadrant |
| QUJ | Will you indicate the TRUE track to reach you? or The TRUE track to reach me is... degrees at... hours (to be used in radiotelegraphy as a Q Code) |
| R - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| R | Right (Preceded by runway designation number to identify a parallel runway) |
| R | Rate of turn |
| R | Red |
| R | Restricted area (followed by identification) |
| R | Runway (followed by figures in METAR/SPECI |
| R | Right (runway identification) |
| R | Received (acknowledgement of receipt) (to be used in AFS as a procedure signal) |
| R | Radial from VOR (followed by three figures) |
| RA | Rain |
| RA | Resolution advisory |
| RAC | Rules of the air and air traffic services |
| RAD | Route Availability Document |
| RADAR | Radio Detection and Ranging |
| RAFC | Regional area forecast centre |
| RAG | Ragged |
| RAG | Runway arresting gear |
| RALT | Route Alternative |
| RAI | Runway alignment indicator |
| RAIM | Receiver autonomous integrity monitoring(+) |
| RASC | Regional AIS system centre(+) |
| RASS | Remote altimeter setting source |
| RB | Rescue boat |
| RCA | Reach cruising altitude |
| RBK | Readback |
| RCA | Reach cruising altitude |
| RCC | Rescue coordination centre |
| RCF | Radiocommunication failure (message type designator) |
| RCH | Reach or reaching |
| RCL | Runway centre line |
| RCL | Oceanic clearance request |
| RCLL | Runway centre line light(s) |
| RCLR | Recleared |
| RCP | Required communication performance(++) |
| RDH | Reference datum height (for ILS) |
| RDL | Radial |
| RDO | Radio |
| RDOACT | Radioactive |
| RE | Recent (used to qualify weather phenomena, e.g. RERA = recent rain) |
| REA | Ready message |
| REC | Receive or receiver |
| REDL | Runway edge light(s) |
| REF | Reference to... or refer to... |
| REG | Registration |
| REJ | Rejected |
| RENL | Runway end light(s) |
| REP | Report or reporting or reporting point |
| REQ | Request or requested |
| REQ | Reclearance request |
| RERTE | Re-route |
| RESA | Runway end safety area |
| RESPBY | Respond by (Time out to give a response) |
| RET | Rapid exit taxiway |
| RETIL | Rapid exit taxiway indicator lights |
| RF | Constant radius arc to a fix |
| RFF | Rescue and fire fighting |
| RFFS | Rescue and fire fighting services |
| RFP | Replacement flight plan (related to ATFM) |
| RG | Range (lights) |
| RHC | Right-hand circuit |
| RIF | Reclearance in flight |
| RIME | Rime (used in aerodrome warnings)(+) |
| RL | Report leaving |
| RLA | Relay to |
| RLCE | Request level change en route |
| RLLS | Runway lead-in lighting system |
| RLNA | Request level not available |
| RLS | Report Level or Speed |
| RMK | Remark |
| RNAV | (to be pronounced “AR-NAV”) Area navigation(+) |
| RNG | Radio range |
| RNP | Required navigation performance(++) |
| ROBEX | Regional OPMET bulletin exchange (scheme)(+) |
| ROC | Rate of climb |
| ROD | Rate of descent |
| ROFOR | Route forecast (in aeronautical meteorological code) |
| RON | Receiving only |
| RPE | Reported Estimated |
| RPDS | Reference path data selector |
| RP | Recommended Practice |
| RPI | Radar position indicator(++) |
| RPL | Repetitive flight plan |
| RPLC | Replace or replaced |
| RPS | Radar position symbol |
| RPT | Repeat or I repeat (to be used in AFS as a procedure signal)(+) |
| RQ | Request (to be used in AFS as a procedure signal) |
| RQMNTS | Requirements |
| RQP | Request flight plan (message type designator) |
| RQS | Request supplementary flight plan (message type designator) |
| RR | Report reaching |
| RRA | (or RRB, RRC... etc., in sequence) Delayed meteorological message (message type designator) |
| RRP | Rerouting proposal message |
| RSC | Rescue sub-centre |
| RSCD | Runway surface condition |
| RSP | Responder beacon |
| RSP | Required surveillance performance (++) |
| RSR | En-route surveillance radar |
| RSS | Root sum square |
| RTD | Delayed (used to indicate delayed meteorological message; message type designator) |
| RTE | Route |
| RTF | Radiotelephone |
| RTG | Radiotelegraph |
| RTHL | Runway threshold light(s) |
| RTN | Return or returned or returning |
| RTODAH | Rejected take-off distance available, helicopter |
| RTS | Return to service |
| RTT | Radioteletypewriter |
| RTZL | Runway touchdown zone light(s) |
| RUT | Standard regional route transmitting frequencies |
| RV | Rescue vessel |
| RVA | Radar vectoring area |
| RVR | Runway visual range(++) |
| RVSM | Reduced Vertical Separation Minimum [300 m (1000 ft) between FL290 and FL410] (++) |
| RWY | Runway |
| S - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| S | Seconds |
| S | South or southern latitude |
| S | State of the sea (followed by figures in METAR/SPECI) |
| S | Surface Analysis (Current Chart) |
| S | Schedule |
| SA | Sand |
| SALS | Simple approach lighting system |
| SAM | Slot Allocation Message |
| SAN | Sanitary |
| SAR | Search and rescue |
| SARPs | Standards and Recommended Practices [ICAO] |
| SAT | Saturday |
| SATCOM | Satellite communication(+) |
| SATVOICE | Satellite voice communication |
| SB | Southbound |
| SBAS | (to be pronounced “ESS-BAS”) Satellite-based augmentation system(+) |
| SC | Stratocumulus |
| SCT | Scattered |
| SD | Standard deviation |
| SDBY | Stand by |
| SDF | Step down fix |
| SE | South-east |
| SEA | Sea (used in connection with sea-surface temperature and state of the sea) |
| SEB | South-eastbound |
| SEC | Seconds |
| SEC | Special event charter flight |
| SECN | Section |
| SECT | Sector |
| SEL | Selcal Code |
| SELCAL | Selective calling system(+) |
| SEP | September |
| SER | Service or servicing or served |
| SEV | Severe (used e.g. to qualify icing and turbulence reports) |
| SFC | Surface |
| SG | Snow grains |
| SGL | Signal |
| SH | Shower (followed by RA = rain, SN = snow, PL = ice pellets, GR = hail, GS = small hail and/or snow pellets or combinations thereof e.g. SHRASN= showers of rain and snow) |
| SHF | Super high frequency (3 000 to 30 000 MHz) |
| SI | International system of units. |
| SID | Standard instrument departure(+) |
| SIF | Selective identification feature |
| SIG | Significant |
| SIGMET | Information concerning en-route weather and other phenomena in the atmosphere that may affect the safety of aircraft operations(+) |
| SIGWX | Significant weather |
| SIMUL | Simultaneous or simultaneously |
| SMA | Schedule movement advice |
| SIP | Slot improvement proposal message |
| SITA | Société Internationale des Telecommunications Aeronautiques |
| SIWL | Single isolated wheel load |
| SKC | Sky clear |
| SKED | Schedule or scheduled |
| SLC | Slot Cancellation Message |
| SLP | Speed limiting point |
| SLW | Slow |
| SMC | Surface movement control |
| SMR | Surface movement radar |
| SN | Snow |
| SNOCLO | Aerodrome closed due to snow (used in METAR/SPECI) |
| SNOWTAM | 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, by means of a specific format(+) |
| SOC | Start of climb |
| SPA | Slot improvement proposal acceptance message |
| SPECI | Aerodrome special meteorological report (in meteorological code) |
| SPECIAL | Local special meteorological report (in abbreviated plain language)(+) |
| SPI | Special position indicator |
| SPL | Supplementary flight plan (message type designator) |
| SPOC | SAR point of contact |
| SPOT | Spot wind(+) |
| SQ | Squall |
| SQK | SSR Assignment |
| SQL | SquaIl line |
| SR | Sunrise |
| SRA | Surveillance radar approach |
| SRE | Surveillance radar element of precision approach radar system |
| SRG | Short range |
| SRJ | Slot Improvement Proposal Rejection Message |
| SRM | Slot Revision Message |
| SRR | Search and rescue region |
| SRY | Secondary |
| SS | Sandstorm |
| SS | Sunset |
| SSB | Single sideband |
| SSE | South-south-east |
| SSR | Secondary surveillance radar(++) |
| SST | Supersonic transport |
| SSW | South-south-west |
| ST | Stratus |
| STA | Straight-in approach |
| STAR | Standard instrument arrival(+) |
| STD | Standard |
| STF | Stratiform |
| STN | Station |
| STNR | Stationary |
| STOL | Short take-off and landing |
| STS | Status |
| STWL | Stopway light(s) |
| SUBJ | Subject to |
| SUN | Sunday |
| SUP | Supplement (AIP Supplement) |
| SUPPS | Regional supplementary procedures |
| SVC | Service (message type only) |
| SVCBL | Serviceable |
| SW | South-west |
| SWB | South-westbound |
| SWH | Significant weather high chart |
| SWM | Significant weather medium chart |
| SWY | Stopway |
| T - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| T | Temperature |
| T | True (preceded by a bearing to indicate reference to True North) |
| T | Telephone |
| T-VASIS | T Visual Approach Slope Indicator System |
| TA | Transition altitude |
| TA | Traffic advisory |
| TAA | Terminal arrival altitude |
| TA/H | Turn at an altitude/height |
| TACAN | UHF tactical air navigation aid(+) |
| TACT | NM Tactical |
| TAF | Aerodrome forecast (in meteorological code)(+) |
| TAIL | Tail wind(+) |
| TAR | Terminal area surveillance radar |
| TAS | True airspeed |
| TAX | Taxiing or taxi |
| TBN | To be notified |
| TC | Tropical cyclone |
| TCAC | Tropical cyclone advisory centre |
| TCAS RA | Traffic alert and collision avoidance system resolution advisory (to be pronounced “TEE-CAS-AR-AY”)(+) |
| TCH | Threshold crossing height |
| TCP | Transfer Control Point |
| TCU | Towering cumulus |
| TDO | Tornado |
| TDZ | Touchdown zone |
| TDZE | Touchdown zone elevation |
| TECR | Technical reason |
| TEL | Telephone |
| TEMPO | Temporary or temporarily(+) |
| TEND | Trend forecast(+) |
| TER | Terrain |
| TERPS | Terminal procedures |
| TF | Track to fix |
| TFC | Traffic |
| TGL | Touch-and-go landing |
| TGS | Taxiing guidance system |
| THR | Threshold |
| THRU | Through |
| THU | Thursday |
| TIBA | Traffic information broadcast by aircraft(+) |
| TIL | Until(+) |
| TIP | Until past... (followed by place) |
| TL | Till (followed by time by which weather change is forecast to end) |
| TKOF | Take-off |
| TLOF | Touchdown and lift-off area |
| TMA | Terminal control area(++) |
| TN | Minimum temperature (followed by figures in TAF) |
| TNA | Turn altitude |
| TNH | Turn height |
| TO | To... (followed by place) |
| TOC | Top of climb |
| TOBT | Target of block time |
| TODA | Take-off distance available |
| TODAH | Take-off distance available helicopter |
| TOP | Cloud top(+) |
| TORA | Take-off run available |
| TOX | Toxic |
| TP | Turning point |
| TR | Track |
| TRA | Temporary reserved airspace |
| TRANS | Transmits or transmitter |
| TREND | Trend forecast(+) |
| TRG | Training |
| TRL | Transition level |
| TROP | Tropopause |
| TS | Thunderstorm (in aerodrome reports and forecasts, TS used alone means thunder heard but no precipitation at the aerodrome) |
| TS | Thunderstorm (followed by RA=RAIN, SN=snow, PL=ice pellets, GR=hail, GS=small hail and/or snow pellets or combinations thereof e.g. TSRASN=thunderstorm with rain and snow) |
| TSA | Temporary Segregated Area(+) |
| TSUNAMI | Tsunami (used in aerodrome warnings) |
| TT | Teletypewriter |
| TUE | Tuesday |
| TURB | Turbulence |
| TVOR | Terminal VOR |
| TWR | Aerodrome control tower or aerodrome control |
| TWY | Taxiway |
| TX | Maximum temperature (followed by figures in TAF) |
| TXL | Taxilane |
| TXT | Text (when the abbreviation is used to request a repetition, the question mark (IMI) Precedes the abbreviation, eg. IMI TXT) (to be used in AFS as a procedure signal) |
| TYP | Type of aircraft |
| TYPH | Typhoon |
| U - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| U | Upward (tendency in RVR during previous 10 minutes) |
| UA | Unmanned aircraft |
| U/S | Unserviceable |
| UAB | Until advised by... |
| UAC | Upper area control centre |
| UAR | Upper air route |
| UAS | Unmanned aircraft system |
| UDF | Ultra high frequency direction-finding station |
| UFN | Until further notice |
| UHDT | Unable higher due traffic |
| UHF | Ultra high frequency [300 to 3 000 MHz] (++) |
| UIC | Upper information centre |
| UIR | Upper flight information region(++) |
| ULM | Ultra Light motorized Aircraft |
| ULR | Ultra long range |
| UNA | Unable |
| UNAP | Unable to approve |
| UNL | Unlimited |
| UNREL | Unreliable |
| UP | Unidentified precipitation (used in automated METAR/SPECI) |
| UTA | Upper control area |
| UTC | Coordinated Universal Time(++) |
| UTCW | Coordinated Universal Time - Winter |
| V - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| V | Variations from the mean wind direction (preceded and followed by figures in METAR/SPECI, e.g. 350V070) |
| VA | Volcanic ash |
| VA | Heading to an altitude |
| VAAC | Volcanic ash advisory centre |
| VAC | Visual approach chart (followed by name/title) |
| VAL | In valleys |
| VAN | Runway control van |
| VAR | Magnetic variation |
| VAR | Visual-aural radio range |
| VASIS | Visual approach slope indicator systems |
| VAT | Value-added tax |
| VC | Vicinity of the aerodrome (followed by FG=fog, FC=funnelcloud, SH=shower, PO=dust/sand whirls, BLDU=blowing dust, BLSA=blowing sand, BLSN = blowing snow, DS = duststorm or SS = sandstorm, e. g. VCFG = vicinity fog) |
| VCY | Vicinity |
| VDF | Very high frequency direction-finding station |
| VDP | Visual descend point |
| VER | Vertical |
| VET | Veterinary |
| VFR | Visual flight rules (++) |
| VHF | Very high frequency (30 to 300 MHz)(++) |
| VI | Heading to an intercept |
| VIP | Very important person(++) |
| VIS | Visibility |
| VLF | Very low frequency [3 to 30 KHz] |
| VLR | Very long range |
| VM | Heading to a manual termination |
| VMC | Visual meteorological conditions(++) |
| VNAV | Vertical navigation (to be pronounced VEE-NAV)(++) |
| VOL... | Volume (followed by I, II...) |
| VOLMET | Meteorological information for aircraft in flight(+) |
| VOR | VHF omnidirectional radio range(++) |
| VORTAC | VOR and TACAN combination(++) |
| VOT | VOR airborne equipment test facility |
| VPA | Vertical path angle |
| VPT | Visual manoeuvre with prescribed track |
| VRB | Variable |
| VSA | By visual reference to the ground |
| VSP | Vertical speed |
| VTF | Vector to final |
| VTOL | Vertical take-off and landing |
| VV | Vertical visibility (followed by figures in METAR/SPECI and TAF) |
| W - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| W | West or western longitude |
| W | White |
| W | Width or wide |
| W | Significant Weather Chart |
| W | Sea-surface temperature (followed by figures in METAR/SPECI) |
| WAAS | Wide area augmentation system(+) |
| WAC | World Aeronautical Chart - ICAO 1: 1 000 000 (followed by name/title) |
| WAFC | World area forecast centre |
| WB | Westbound |
| WBAR | Wing bar lights |
| WDI | Wind direction indicator |
| WDSPR | Widespread |
| WED | Wednesday |
| WEF | With effect from or effective from |
| WGS-84 | World Geodetic System - 1984 |
| WI | Within |
| WID | Width or wide |
| WIE | With immediate effect or effective immediately |
| WILCO | Will comply(+) |
| WIND | Wind |
| WINTEM | Forecast upper wind and temperature for aviation |
| WIP | Work in progress |
| WKN | Weaken or weakening |
| WNW | West-north-west |
| WO | Without |
| WPT | Way-point |
| WRNG | Warning |
| WS | Wind shear |
| WSPD | Wind speed |
| WSW | West-south-west |
| WT | Weight |
| WTSPT | Waterspout |
| WWW | Worldwide web |
| WX | Weather |
| WXR | Weather radar |
| X - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| X | Cross |
| XBAR | Crossbar (of approach lighting system) |
| XNG | Crossing |
| XS | Atmospherics |
| Y - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| Y | Yellow |
| YCZ | Yellow caution zone (runway lighting) |
| YES | Yes (affirmative) (to be used in AFS as a procedure signal) |
| YR | Your |
| Z - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z GLOSSARY OF TERMS | |
| Z | Coordinated Universal Time (in meteorological messages) |