ICAO abbreviations shall be used in the aeronautical information services whenever they are appropriate and their use will facilitate distribution of aeronautical data and aeronautical information.
| ~ | Differences from ICAO Abbreviations (Doc 8400) |
| † | 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 is also available for use in communicating with stations of the maritime mobile service. |
| # | 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 | |
| A~ | Abbreviated VASI |
| A | Amber |
| A/A | Air-to-air |
| A/G | Air-to-ground |
| AAA | (or AAB, AAC...etc.. in sequence) Amended meteorological message (message type designator) |
| AAD | Assigned altitude deviation |
| AAIM | Aircraft autonomous integrity monitoring |
| AAL | Above aerodrome level |
| AAR | Air to air refuelling |
| ABI | Advanced 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 |
| ACSA~ | Airports Company South Africa |
| ACT | Active or activated or activity |
| AD | Aerodrome |
| ADA | Advisory area |
| ADC | Aerodrome chart |
| ADDN | Addition or additional |
| ADF‡ | Automatic direction finding equipment |
| ADIZ† | "Air defence identification zone (to be pronounced ""AY-DIZ"")" |
| 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 /Address (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 fled 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 |
| AGA | Aerodrome, a if routes and ground aids |
| AGL | Above ground level |
| AGN | Again |
| AIC | Aeronautical information circular |
| AIDC | Air traffic services interfacility data communications |
| AIP SUP | Aip supplement |
| AIR | 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 |
| AIS | Aeronautical information services |
| ALA | Alighting area |
| ALERFA† | Alert phase |
| ALR | Alerting (message type designator) |
| ALRS | Alerting service |
| ALS | Approach lighting system |
| ALSF-1~ | Approach light systems with sequenced flashing lights in CAT 1 Configuration. |
| ALSF-2~ | Approach light system with red barrettes and sequenced flashing lights. |
| ALT | Altitude |
| ALTN | Alternate (aerodrome) |
| ALTN | Alternate or alternating (light alternates in colour) |
| AM~ | Amber |
| AMA | Area minimum altitude |
| AMATIS~ | AMHS Agent Terminal Interface System |
| AMD | "Amend or amended (used to indicate amended meteorological message; message type designator)" |
| AMDT | Amendment (AIP Amendment) |
| AMHS~ | Aeronautical Message Handling System |
| AMS | Aeronautical mobile service |
| AMSL | Above mean sea level |
| AMSS | Aerodrome mobile satellite service |
| ANAIS~ | Aeronautical Automated Information System |
| ANC | Aeronautical chart - 1:600 000 (followed by name/title) |
| ANCS | Aeronautical Navigation Chart - small scale (followed by name/title and scale) |
| ANS | Answer |
| 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) |
| APN | Apron |
| APP | Approach control office or approach control or approach control service |
| APR | April |
| APRX | Approximate or approximately |
| APSG | After passing |
| APV | Approve or approved or approval |
| ARC | Area chart |
| 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) |
| ARST | Arresting [specify (part of) aircraft arresting equipment] |
| AS | Altostratus |
| ASC | Ascent to or ascending to |
| ASE | Altimetry system error |
| ASHTAM | Special series of NOTAM notifying, by means of a specific formal, change In activity of a volcano, a volcanic eruption and/or volcanic ash cloud that is of significance lo aircraft operations |
| ASOA | Accelerate-stop distance available |
| ASPH | Asphalt |
| AT-VASIS† | (to be pronounced “AY-TEE-VASIS”) Abbreviated T visual approach slope Indicator system |
| 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 |
| ATN | Aeronautical telecommunication network |
| ATP | At… (time or place) |
| ATS | Air traffic services |
| ATSU~ | Air Traffic Service Unit |
| ATTN | Attention |
| ATZ | Aerodrome traffic zone |
| AUG | August |
| AUTH | Authorized or authorization |
| AUW | All up weight |
| AUX | Auxiliary |
| AVBL | Available of availability |
| AVG | Average |
| AVGAS† | Aviation gasoline |
| 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 | |
| (B)~ | Bi-directional |
| B~ | Bar |
| B | Blue |
| BA | Braking action |
| BARO-VNAV† | (to be pronounced “BAA-RO -VEE-NAV”) Barometric vertical navigation |
| BASE† | Cloud base |
| BCFG | Fog patches |
| BCN | Beacon (Aeronautical ground light) |
| BCST | Broadcast |
| BDRY | Boundary |
| BECMG | Becoming |
| BFR | Before |
| BKN | Broken |
| BL | Blue |
| 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 |
| BS | Commercial broadcasting station |
| BTL | Between layers |
| BTN | Between |
| BUFR | Binary universal form for the representation of meteorological data |
| 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 | |
| C | Centre (runway identification) |
| CA | Course to an altitude |
| CALVERT~ | Configuration and *2 indicating Cat 2 configuration. Barrettes inner 1000 ft (305 m). |
| CAMU~ | Central Airspace Management Unit |
| CAT | Category |
| CAT | Clear air turbulence |
| CAVOK | "Visibility, cloud and present weather belter than prescribed values or conditions (to be pronounced ""KAV-OH-KAY"")" |
| CB~ | Automatic dependent surveillance - broadcast (details) ads-b |
| CB‡ | "Cumulonimbus (to be pronounced ""CEE BEE"")" |
| CBP~ | Cloud Break Procedure |
| CC~ | Automatic dependent surveillance - contract(details) ads-c |
| CC | Cirrocumulus |
| CCA | (or CCS, CCC...etc.. in sequence) Corrected meteorological message (message type designator) |
| CCT~ | Circuit |
| CD | Candela |
| CD~ | Coded |
| CD~ | Controller-pilot data link communications (details) cpdlc |
| CD5B~ | Coded approach light system with 5 bars suffix -1 for CAT ILS 1. |
| CF | Change frequency to... |
| CF | Course to a fix |
| CFM* | Confirm or 1 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 your messages received on the channel (to be used in AFS as per procedure signal) |
| CHEM | Chemical |
| CHF~ | Aerodrome Authority |
| CHG | Modification (message type designator) |
| CIDIN | Common ICAO data interchange network |
| CIT | Near or over large towns |
| CIV | Civil |
| CK | Check |
| CL | Centre Line |
| CL | Cirrus |
| CL30M~ | Centreline. The figures indicate the spacing between lights when known. |
| CL4B~ | Centreline with 4 bars (single row not coded) Prefixed by “B” indicates bar centreline. |
| CLA | Clear type of ice formation |
| CLBR | Calibration |
| CLCD~ | Coded centreline. White, alternative white and red, red. |
| CLD | Cloud |
| CLD~ | Configuration deviation list |
| 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 dosing |
| CM | Centimeter |
| CMB | Climb to or climbing to |
| CMPL | Completion or completed or complete |
| CNL | Cancel of cancelled |
| CNL | Plight plan cancellation message (massage type designator) |
| CNS | Communication, navigation and surveillance |
| CON | Co-ordination (message type designator) |
| CONC | Concrete |
| COND | Condition |
| CONS | Continuous |
| CONST | Construction or constructed |
| CONT | Continue(s) or continued |
| COOR | Co-ordinate or coordination |
| COORD | Coordinates |
| COP | Change over point |
| COR | "Corrector 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) |
| CRC | Cyclic redundancy check |
| CRM | Collision risk mode! |
| CRZ | Cruise |
| CS | Call Sign |
| CS | Cirrostratus |
| CTA | Control area |
| CTAM | Climb to and maintain |
| CTC | Contact |
| CTL | Control |
| CTN | Caution |
| CTR | Control zone |
| CU | Cumulus |
| CUF | Cumuliform |
| CUST | Customs |
| CVR | Cockpit voice recorder |
| CW | Continuous wave |
| CWY | Clearway |
| CZ | Caution zone. Last 2000 FT (610m) of runway usually indicated by yellow edge lights. |
| °C | Degrees Celsius (Centigrade) |
| 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 | |
| ... D~ | DME Distance |
| D | Downward (tendency In RVR during previous 10 minutes) |
| D ... | Danger area (followed by Identification) (see FAD) |
| D-ATIS† | "(to be pronounced ""DBE-ATIS"") Data link automatic terminal information service" |
| D-VOLMET | Date link VOLMET |
| DA | Decision attitude |
| DA/H~ | Decision altitude/height |
| DAME~ | Designated aviation medical examiner |
| DCD | Double channel duplex |
| DCKG | Docking |
| 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 cell sign of the calling station) (to be used in AFS as a procedure signal) |
| DEC | December |
| DEC~ | From (used to precede the calf sign of the calling station) (to be used in AFS as a procedure signal) |
| 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 |
| DFTL | Distances from touch down Indicator |
| DH | Decision height |
| DIA~ | Diameter |
| DIF | Diffuse |
| DIST | Distance |
| DIV | Divert or diverting |
| DLA | Delay or delayed |
| DLY | Daily |
| DME‡ | Distance measuring equipment |
| DNG | Danger or dangerous |
| DOD~ | Department of Defence |
| DOM | Domestic |
| DOT~ | Department of Transport |
| 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 | Delay (massage type designator) |
| DU | Dust |
| DUC | Data link initiation capability |
| DUC | Dense upper doud |
| DUPE# | This is a duplicate message (to be used is AFS as a procedure signal) |
| DUR | Duration |
| DVOR | Doppler VOR |
| 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 | |
| E | East or eastern longitude |
| EAT | Expected approach time |
| EB | Eastbound |
| EDA | Elevation differential area |
| 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 overlay service" |
| EHF | Extremely high frequency (30000 to 300000 MHz) |
| EL/REIL~ | Runway end lights/Runway end identifier lights |
| 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 |
| END | Stop-end (related to RVR) |
| ENE | East north east |
| ENG | Engine |
| ENR | En route |
| ENRC | Enroute chat (followed by name/title) |
| EOBT | Estimated off-Block lime |
| EQN | Equatorial latitudes northern hemisphere |
| EQPT | Equipment |
| EQS | Equatorial latitudes southern hemisphere |
| ER | Here... or herewith |
| EROPS~ | Extended range operations |
| ESE | East south east |
| EST | Estimate or estimated or estimate (as massage type designator) |
| ETA*‡ | Estimated time of arrival or estimating arrival |
| ETD‡ | Estimated lime of departure or estimating departure |
| ETO | Estimated lime over significant point |
| ETOPS~ | Extended range operations with twin-engine aircraft |
| EUR RODEX | European regional OPMET data exchange |
| EV | Every |
| EVS | Enhanced vision system |
| EXC | Except |
| EXER | Exercises or exercising or to exercise |
| EXP | Expert or expected or expecting |
| EXTD | Extend or extending |
| 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 | |
| F | Fixed |
| F~ | Sequenced flashing lights. |
| FA | Course from a fix to an altitude |
| FAC | Facilities |
| FAD~ | Danger Area (South Africa) |
| FAF | Final approach fix |
| FAL | Facilitation of international air transport |
| FAP | Final approach point |
| FAP~ | Prohibited area (South Africa) |
| FAR~ | Restricted area (South Africa) |
| 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 |
| FG | Fog |
| FIC | Fight Information centre |
| FIR‡ | Flight Information region |
| FIS | Flight Information service |
| FISA | Automated flight information service |
| FL | Flight level |
| FLD | Field |
| FLG | Flashing |
| FLO~ | Floodlights |
| FLR | Flares |
| FLT | Flight |
| FLTCK | Flight check |
| FLUC | Fluctuating, fluctuation or fluctuated |
| FLW | Follow(s) or following |
| FLY | Fly or flying |
| FM | Course from a fix to manual termination (used in navigation database coding) |
| FM | From |
| FM ... | From (followed by time weather change is forecast to begin) |
| FMC | Flight management computer |
| FMS‡ | Flight management system |
| FMU | Flow management unit |
| FNA | Final approach |
| FPAP | Flight path alignment point |
| FPM | Feet per minute |
| FPR | Flight plan route |
| FPU~ | Filed flight plan (message type designator) |
| FR | Fuel remaining |
| FREQ | Frequency |
| FRI | Friday |
| FRNG | Firing |
| FRONT† | Front (relating to weather) |
| FROST† | Frost (used In aerodrome warnings) |
| FRQ | Frequent |
| FS~ | French standard |
| FSL | Full stop tending |
| FSS | Flight service station |
| FST | First |
| FT | Feet (dimensional unit) |
| FTA~ | Flight training area |
| 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 | |
| G | Green |
| G | Indicator for variations from the mean wind speed (gusts) (used in the METAR/SPECI and TAF code forms) |
| G/A | Ground-to-air |
| G/A/G | Ground-lo-air and air-to-ground |
| GA | Go ahead, resume ¿ending (to be used in APS as a procedure signal) |
| 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" |
| GCA‡ | Ground controlled approach system or ground controlled approach |
| GEN | General |
| GEO | Geographic or true |
| GES | Ground earth station |
| GLO | 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 |
| GP | Glide path |
| GPA | Global path angle |
| GPIP | Glide path Intercept point |
| GPS‡ | Global positioning system |
| GPWS‡ | Ground proximity warning system |
| GR~ | Earth (runway) |
| GR | Green |
| GR | Hail |
| GRAS | "(to be pronounced ""GRASS"") Ground-based regional augmentation system." |
| GRASS | Grass landing area |
| GRAV~ | Gravel (Runway) |
| GRIB | Processed meteorological data in form of grid point values expressed in binary form (aeronautical meteorological code) |
| GRVL | Gravel |
| GS~ | Grass (Runway) |
| GS | Ground speed |
| GS | Small hail and or snow pallets |
| GUND | Geold undulation |
| g/m3 | Grams per cubic meter |
| 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 | |
| H~ | High intensity |
| H | High pressure area or the centre of high pressure |
| H24 | Continuous day and night service |
| HA | Holding/racetrack lo an altitude |
| HAPI | Helicopter approach path indicator |
| HBN | Hazard beacon |
| HDF | High frequency direction-finding station |
| HDG | Heading |
| HEL | Helicopter |
| HF‡ | High frequency (3000 to 30000 kHz) |
| HF | Holding/racetrack to a fix |
| HGT | Height or height above |
| HJ | Sunrise to sunset |
| HLDG | Holding |
| HM | Holding/racetrack to a manual termination |
| HN | Sunset to sunrise |
| HNH | High latitudes northern hemisphere |
| HO | Service available to meet operational requirements |
| HOD~ | Hours of duty. |
| HOL | Holiday |
| HOSP | Hospital aircraft |
| HPA | Hectopascal |
| HR | Hours |
| HS | Service available during hours of scheduled operations |
| HSH | High latitudes southern hemisphere |
| HST~ | High speed turn-off lights. |
| HUD | Head-up display |
| HURCN | Hurricane |
| HVDF | High and very high frequency direction finding stations (of 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 | |
| IAC | Instrument approach chart |
| IAF | initial approach fix |
| IAIP~ | Integrated aeronautical Information package |
| IAL~ | Instrument approach and landing chart |
| IALS~ | Intermediate approach lighting system |
| IAO | In and out of clouds |
| IAP | instrument approach procedure |
| IAR | Intersection of air routes |
| IAS | Indicated air speed |
| IBN | Identification beacon |
| IC | Ice crystals (very small ice crystals in suspension, also known as diamond dust) |
| ICAO* | International Civil Aviation Organization |
| ICE | Icing |
| ID | Identifier or Identify |
| IDENT† | Identification |
| IF | Intermediate approach fix |
| IFF | Identification friend/foe |
| IFR‡ | Instrument flight rules |
| IGA | International general aviation |
| ILS‡ | Instrument landing system |
| IM | inner marker |
| IMC‡ | instrument meteorological conditions |
| IMG | Immigration |
| IMII* | 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 |
| 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 |
| 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 | |
| JAN | January |
| 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 | |
| KG | Kilograms |
| KHZ* | Kilohertz |
| KIAS | Knots Indicated airspeed |
| KM | Kilometers |
| KMH | Kilometers per hour |
| KPA | Kilopascal |
| KT | Knots |
| KW | Kilowatts |
| kg/cm2~ | Kilograms per square centimeter |
| 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 | |
| L | Left (preceded by runway designation number to identify a parallel runway) |
| L | Locator (see LM, LO) |
| L | Low intensity |
| L | Low pressure area or the centre of low pressure |
| LAM | Logical acknowledgement (message type designator) |
| LAN | Inland |
| LASS~ | Lowveld Military Airspace Sector |
| LAT | Latitude |
| LB~ | 3 Bar VASI (Long bodied) |
| LCA | Local or locally or location or located |
| LCN~ | Load classification number |
| LDA | Landing distance available |
| LDAH | Landing distance available, helicopter |
| LDI | Landing direction Indicator |
| LDIN~ | Sequenced flashing lead in lights. |
| 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 SIGMBT) |
| LM | Locator middle |
| LMT | Local mean time |
| LNAV† | "(to be pronounced ""EL-NAV"") Lateral navigation" |
| LNG | long (used to indicate the type of approach desired or required) |
| LO | Locator, outer |
| LOC | Localizer |
| LOG | Landing |
| LONG | Longitude |
| LORAN† | LORAN (tong range air navigation system) |
| LOSS | Airspeed or headwind toss |
| LPV | Localizer performance with vertical guidance |
| LR | The last message received by me was... or Last message 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) |
| LTD | Limited |
| LTT | Landline teletypewriter |
| LV | Light and variable (relating to wind) |
| LVE | Leave or leaving |
| LVL | Level |
| LVP | Low visibility procedures |
| 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 | |
| M~ | Medium intensity |
| M | Minimum value of runway visual range (followed by figures In METAR/SPECI) |
| M ... | Mach number (followed by figures) |
| MAA | Maximum authorized altitude |
| MAG | Magnetic |
| MAHF | Missed approach holding fix |
| MAINT | Maintenance |
| MALS~ | Medium intensity approach system. May be installed with sequenced flashing lights (MALSF) or runway alignment indicator lights (MALSR). |
| MAP | Aeronautical maps and charts |
| MAPT | Missed approach point |
| MAR | At sea |
| MAR | March |
| MAS | Manual Al simplex |
| MATF | Missed approach turning fix |
| MAX | Maximum |
| MAY | May |
| MBST | Microburst |
| MCA | Minimum crossing altitude |
| MCM | Maximum certified mass |
| MCW | Modulated continuous wave |
| MDA | Minimum descent altitude |
| MDA/H~ | Minimum descent altitude/height |
| MDF | Medium frequency direction-finding station |
| MDH | Minimum descent height |
| MEA | Minimum En-route altitude |
| MEHT | Minimum eye height over threshold (for visual approach slope Indicator system) |
| MEL~ | Minimum equipment list |
| MET† | Meteorological or meteorology |
| MET REPORT | Local routine meteorological report (in abbreviated plain language) |
| METAR† | Aviation routine weather report (in aeronautical meteorological code) |
| MF | Medium frequency (300 kHz to 3 MHz) |
| MHA* | Minimum holding attitude |
| MHDF | Medium and high frequency direction-finding station (at the same location) |
| MHVDF | Medium, high and very high frequency direction-finding station (at (ha same location) |
| MHZ* | Megahertz |
| MID | Mid-paint (related to RVR) |
| MIFG | Shallow fog |
| MIL | Military |
| MIN* | Minutes |
| MIS | Missing... (transmission identification) (to be used in APS as a procedure signal) |
| MKR | Marker radio beacon |
| MLS‡ | Microwave landing system |
| MM | Middle marker |
| MMT | Monitor or monitoring or monitored |
| MNH | Middle latitudes northern hemisphere |
| MNM | Minimum |
| MNPS | Minimum navigation performance .specifications |
| 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 static reports e.g, MOD RA - moderate rain) |
| MON | Above-mountains |
| MON | Monday |
| MOPS† | Minimum operational performance standards |
| MOV | Move or moving or movement |
| MPS | Meters per second |
| MRA | Minimum reception altitude. |
| MRG | Medium range |
| MRP | ATS/MET reporting point |
| MS | Minus |
| MSA | Minimum sector altitude |
| MSAS† | "(to be pronounced ""EMSAS"") Multifunctional transport satellite (MTSAT) Satafe-based augmentation system" |
| MSAW | Minimum safe altitude warning |
| MSG | Message |
| MSH | Middle latitudes southern hemisphere |
| 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 |
| MTU | Maine units |
| MTW | Mountain waves |
| MUNICIP~ | Municipality, Town Council, etc. |
| MVDF | Medium and very high frequency direction-finding station (at the same location) |
| MVYO | Meteorological watch office |
| MX | Mixed type of ice formation (while and clear) |
| … M | Meters (preceded by figures) |
| 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 | |
| HTZ | No transgression zone |
| 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 | |
| N | No distinct tendency (in RVR during previous 10 minutes) |
| N | North or northern latitude |
| NA~ | Not authorized |
| NADP | Noise abatement departure procedure |
| NASC† | National AIS system centre |
| NAT | North Atlantic |
| NAV | Navigation |
| NB | North bound |
| 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 | Northeast |
| 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 | 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 |
| NOSIG† | No significant change (used in trend-type landing forecasts) |
| NOTAM† | A notice 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 |
| NOV | November |
| NOZ‡ | Normal operating zone |
| NPA | Non precision approach |
| NR | Number |
| NRH | No reply heard |
| NS | Nimbostratus |
| NSC | Mi! significant cloud |
| NSE | Navigation system error |
| NSW | Nil significant weather |
| NTL | National |
| NTZ‡ | No transgression zone |
| NW | Northwest |
| 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 | |
| (O)~ | Omni-directional |
| O~ | Oil |
| O/R | On request |
| 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 |
| OCNL | Occasional or occasionally |
| OCS | Obstacle clearance surface |
| OCT | October |
| ODALS~ | Omni-directional sequenced flashing lead in lights. |
| OFZ | Obstacle free zone |
| OGN | Originate (to be used in APS as a procedure signal) |
| OHD | Overhead |
| OIS | Obstacle Identification surface |
| OK* | We agree or H Is correct (to be used in AFS as a procedure signal) |
| OLDI† | On-line data Interchange |
| OM | Out marker |
| OPA | Opaque, white type of ice formation |
| OPC | The 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 |
| OR | Over-run lights. |
| ORD | Indication of an order |
| OSV | Ocean station vessel |
| OTP | On fop |
| OTS | Organized track system |
| OUBD | Out-bound |
| 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 | |
| P | Indicator for maximum value of wind speed or runway visual range (used in the METAR/SPECI and TAP code forms) |
| P~ | Precision approach path indicator |
| P ... | Prohibited area (followed by identification) |
| PA | Precision approach |
| PALS | Precision approach Sighting system (specify category) |
| PANS | Procedures for air navigation services |
| PAPI† | Precision approach path indicator |
| PAR‡ | Precision approach radar |
| PARL | Parallel |
| PATC | Precision approach terra In chart (followed by name/title) |
| PAX | Passenger(s) |
| PB~ | Private Bag |
| PBE~ | Portable breathing equipment |
| PC~ | Contingency procedures |
| PCD | Proceed or proceeding |
| PCL | Pilot-controlled lighting |
| PCN | Pavement classification number |
| PDC‡ | Pre-departure clearance |
| PDG | Procedure design gradient |
| PER | Performance |
| PERM | Permanent |
| PF~ | Paraffin Flares |
| PIB | Pre-flight Information bulletin |
| PJE | Parachute Jumping exercise |
| PL | Ice pellets |
| PLN | Right plan |
| PLVL | Present level |
| PN | Prior notice required |
| PNR | Point of no return |
| PO | Dust devils/sand whirl (dust devil) |
| POB | Persons on board |
| POSS | Possible |
| PPI | Plan position Indicator |
| PPR | Prior permission required |
| PPSN | Present position |
| PRFG | Aerodrome partially covered by fog |
| PRI | Primary |
| PRIV~ | Aerodrome licensed in Private category |
| PRKG | Parking |
| PROB† | Probability |
| PROG | Procedure |
| PROV | Provisional |
| PRP | Point-In-space reference, point |
| PS | Plus |
| PSG | Passing |
| PSI~ | Pounds per square Inch |
| PSN | Position |
| PSP | Pierced steel plank |
| PSR‡ | Primary surveillance radar |
| PSYS | Pressures/stems |
| PTN | Procedure (urn |
| PTS | Polar track structure |
| PU | Practice low approach |
| PUB~ | Aerodrome licensed in the public category |
| 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 | |
| *QNE | indicated height on landing, with altimeter sub-scale set lo 1013,2 hectopascals |
| 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 radiotelephony 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 radiotelephony 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 0 code) |
| QTE | True bearing |
| 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 radfoteiephony 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 | |
| (R)~ | VOR Radial |
| ... R | Right (preceded by runway designation number to identify a parallel runway) |
| R | Indicator for Runway (METAR/SPECI followed by figures in code forms) |
| R | Rate of turn |
| R | Received (acknowledgement of receipt) (to be used in AFS as a procedure signal) |
| R | Red |
| R ... | Runway (followed by figures in METAR/SPECI) |
| R/T~ | Radio Telephony |
| RA | Rain |
| RA | Resolution advisory |
| RAFC~ | Regional area forecast centre |
| RAG | Ragged |
| RAG | Runway arresting gear |
| RAI | Runway alignment Indicator |
| RAIL~ | Runway alignment indicator lights (always installed with other lighting systems. |
| RAIM† | Receiver autonomous integrity monitoring |
| RASC† | Regional AIS system centre |
| RASS | Remote altimeter setting source |
| RB | Rescue Boat |
| RCA | Reach cruising altitude |
| RCC | Rescue Co-ordination centre |
| RCF | Radiocommunication failure (message type designator) |
| RCH | Reach or reaching |
| RCIR | Recleared |
| RCL | Runway centre line |
| RCP‡ | Required communication performance |
| RD~ | Red |
| RDH~ | Reference datum height (for ILS) |
| RDL | Radial |
| RDO | Radio |
| RE ... | Recent (used to qualify weather phenomena e.g. HERA - recent tain) |
| REC | Receive or receiver |
| REDL | "Runway ""edge tight(s)" |
| REF | Reference to... or refer to ... |
| REG | Registration |
| REIL~ | Runway end lights/Runway end identifier lights. |
| RENL | Runway end light(s) |
| REP | Report or reporting or reporting point |
| REQ | Request or requested |
| RERTE | Reroute |
| RESA | RWY end safety area |
| RF | Constant radius arc lo a fix |
| RG | Range (lights) |
| RHC | Right-hand circuit |
| RIF | Reclearance In flight |
| RIME† | Rime (used in aerodrome warnings) |
| RITE | Right (direction of turn) |
| RL | Report leaving |
| RL~ | Runway edge lights. |
| RLA | Relay to |
| RLCE | Request level change En-route |
| RLLS | Runway lead-in lighting system |
| RLNA | Requested level not available |
| RMK | Remark |
| RNAV† | "Area navigation (to be pronounced ""AR-NAV"")" |
| RNG | Radio range |
| RNP‡ | Required navigation performance |
| ROBEX | Regional OPMET bulletin exchange (scheme) |
| ROC | Rate of climb |
| ROD | Rate of descent |
| ROLL~ | Runway centre line light(s) |
| RON | Receiving only |
| RPDS | Reference path data selector |
| RPI‡ | Radar position indicator |
| RPL | Repetitive flight plan |
| RPLC | Replace or replaced |
| RPS | Radar position symbol |
| RPT* | Repeat or 1 repeat (to be used in AFS as a procedure signal) |
| RQ~ | Indication of a request (to be used in AFS as e 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) |
| RSA~ | Republic of South Africa |
| RSC | Rescue sub-centre |
| RSCD | Runway surface condition |
| RSP‡ | Responder beacon |
| 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 | Radio teletypewriter |
| RTZL | Runway touchdown zone light(s) |
| RUT | Standard regional route transmitting frequencies |
| RV | Rescue vessel |
| 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 | |
| S | Indicator for stale of the sea (used in the METAR/SPECI code forms) |
| S | South or southern latitude |
| S~ | Standard VASI |
| S~ | Strobes |
| S1~ | Hangarage |
| S2~ | Hangarage and minor aircraft repairs |
| S3~ | Hangarage, minor aircraft repairs and minor engine repairs |
| S4~ | Hangarage, major aircraft repairs and minor engine repairs |
| S5~ | Hangarage, major aircraft repairs and engine repairs |
| SA | Sand |
| SA-CARS~ | South African Civil Aviation Regulations |
| SACAA~ | South African Civil Aviation Authority |
| SALS~ | Simple approach lighting system |
| SAN | Sanitary |
| SAND~ | Sandy soil |
| SANDF~ | South African National Defence Force |
| SAP | As soon as possible |
| SAPS~ | South African Police Service |
| SAR | Search and rescue |
| SARPS | Standards and Recommended Practices (ICAO) |
| SAT | Saturday |
| SATCOM† | Satellite communication |
| SB | Southbound |
| SC | Stratocumulus |
| SCT | Scattered |
| SD | Sodium |
| SD | Standard deviation |
| SDBY | Stand by |
| SDF | Step down fix |
| SE | Southeast |
| SEA | Sea (used In connection with sea surface temperature end state oflfia sea) |
| SEB | South-Eastbound |
| SEC | Seconds |
| SECN | Section |
| SECT | Sector |
| 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 … | Showers (followed by RA=rain, SN=snow, PE=ice pellets, GR=hall, QS=small hall and or snow pellets or combinations thereof, e.g. SHRASN=showers of rain and snow) |
| SHF | Super high frequency (3 to 30 GHz) |
| SI | International system of units |
| SID† | Standard instrument departure |
| SIF | Selective identification feature |
| SIG | Significant |
| SIGMET† | information concerning En-route weather phenomena which may affect the safety of aircraft operations |
| SIMUL | Simultaneous or simultaneously |
| SIN | Station |
| SITA~ | Social international de Telecommunication Aeronautique (a private satellite communication system) |
| SIWL | Single isolated wheel load |
| SKED | Schedule or scheduled |
| SLP | Speed limiting point |
| SLW | Slow |
| SMC | Surface movement control |
| SMR | Surface movement radar |
| SN | Snow |
| SNOCLO | Indicator for the aerodrome being dosed due to snow on the runway (used In the METAR/SPECI code forms) |
| SNOWTAM† | A special series NOTAM notifying the presence of removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement are, by means of a specific format |
| SOC | Start of climb |
| SPECI† | Aviation selected special weather report (in Aeronautical meteorological code) |
| SPECIAL† | 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 |
| SQL | Squall line |
| SR | Sunrise |
| SRA | Surveillance radar approach |
| SRE | Surveillance radar element of precision approach radar system |
| SRG | Short range |
| SRR | Search and rescue region |
| SRY | Secondary |
| SS | Sandstorm |
| SS | Sunset |
| SSALS~ | Simplified short approach light system. May be installed with sequenced flashing tights (SSALS) or runway alignment indicator lights (SSALR). |
| SSB | Single sideband |
| SSE | South south east |
| SSR‡ | Secondary surveillance radar |
| SST | Supersonic transport |
| SSW | South southwest |
| ST | Stratus |
| STA | Straight-in approach |
| STAR† | Standard instrument arrival route |
| STD | Standard |
| STF | Stratform |
| 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 |
| SVCBL | Serviceable |
| SW | Southwest |
| SWB | South-Westbound |
| SWX | Space weather |
| SWXC | Space weather centre |
| 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 | |
| T~ | """T"" Type" |
| T | Temperature |
| T-VASIS | "(to be pronounced ""TEE-VASIS"") T visual approach siope Indicator systems" |
| TA | Traffic advisory |
| TA | Transition altitude |
| TA/H | Turn at an altitude/height |
| TACAN† | UHF tactical air navigation aid |
| TAF† | Aerodrome forecast |
| TAIL† | Tail, wind |
| TAR | Terminal area surveillance radar |
| TAS | True airspeed |
| TAX | Taxiing or taxi |
| TC | Tropical cyclone |
| TCAC | Tropical cyclone advisory centre |
| TCAS RA† | "(to be pronounced ""TEE-CAS-AR-AY"") Traffic alert and collision avoidance system resolution advisory" |
| TCH | Threshold crossing height |
| TCU | Towering cumulus |
| TDZ | Touchdown zone |
| TECR | Technical reason |
| TEL | Telephone |
| TEMPO~ | Temporary or temporarily |
| TF | Track to fix |
| TF~ | Turbine Fuel |
| 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..(p/ace) |
| TKOF | Take off |
| TL ... | Till (followed by time by which weather change is forecast to end) |
| TLOF | Touchdown and lift-off area |
| TMA | Terminal control area |
| TMM* | Transmissometer |
| TN | Indicator for minimum temperature (used in the TAP code form) |
| TNA | Turn altitude |
| TNH | Turn height |
| TO | To…(place) |
| TOC | Top of climb |
| TODA | Take-off distance available |
| TODAH | Take-off distance available, helicopter |
| TOO | Tornado |
| TOP† | Cloud top |
| TORA | Take-off run available |
| TOX | Toxic |
| TP | Turning point |
| TPI~ | Traffic Pattern Indicator |
| TR | Track |
| TRA | Temporary reserved airspace |
| TRANS | Transmits or transmitter |
| TREND† | Trend forecast |
| TRL | Transition level |
| TROP | Tropopause |
| TS | Thunderstorm (in Aerodrome reports and forecasts, TS used atone means thunder heard but no precipitation at the Aerodrome) |
| TS ... | Thunderstorm (followed by RA=rain, SN=snow, PE=ice pellets, GR=hail, GS=small hair and or snow pellets or combinations thereof e.g. TSRASN = thunderstorm with rain and snow) |
| TSO* | Technical Standard Order |
| TSUNAMI† | Tsunami (used in aerodrome warnings) |
| TT | Teletypewriter |
| TUE | Tuesday |
| TURB | Turbulence |
| TVOR | Terminal VOR |
| TWR | Aerodrome control lower or Aerodrome control |
| TWVL | TaxJway-link |
| TWY | Taxiway |
| TX | Indicator for maximum temperature (used in the TAP code form) |
| TXT* | Text (when the abbreviation is used to request a repetition, the question mark (IMI) precedes the-abbreviation, e.g. 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 | |
| (U)~ | Uni-directional |
| U | Upward (tendency in RVR during previous 10 minutes) |
| U/S | Unserviceable |
| UA | Unmanned aircraft |
| 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 3000 MHz) |
| UIC | Upper Information centre |
| UIR‡ | Upper flight Information region |
| ULR | Ultra long range |
| UNA | Unable |
| UNAP | Unable to approve |
| UNL | Unlimited |
| UNREL | Unreliable |
| UTA | Upper control area |
| UTC‡ | Co-ordinated universal time |
| 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 | |
| V~ | High intensity |
| V | Indicator for variations from the mean wind direction (used in the METAR/SPECI code forms) |
| VA | Heading to an altitude |
| VA | Volcanic ash |
| VAAC | Volcanic ash advisory centre |
| VAC | Visual approach chart |
| VAL | In vailays |
| VAN | Runway control van |
| VAR | Magnetic variation |
| VAR | Visual-aurai radio range |
| 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, e.g. VC FG=vicinity fog) |
| VCY | Vicinity |
| VDF | Very high frequency direction-finding station |
| VER | Vertical |
| VFR‡ | Visual flight roles |
| 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† | "(to be pronounced ""VEE-NAV"") Vertical navigation" |
| VOLMET† | meteorological information for aircraft in flight |
| VOR‡ | VHF omnidirectional radio range |
| VORTAC† | VOR and TACAN combination |
| VOT | VOR airborne equipment test facility |
| VRB | Variable |
| VSA | By visual reference to the ground |
| VSP | Vertical speed |
| VTF | Vector to final |
| VTOL | Vertical take-off arid landing |
| VV | Vertical visibility (used in the METAR/SPECI end TAP code forms) |
| 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 | |
| W | Indicator for sea-surface temperature (used in the METAR/SPECI code forms) |
| W~ | Watt |
| W | West or western longitude |
| W | White |
| WAC | World Aeronautical Chart-ICAO 1:1000000 |
| 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 |
| WH~ | Blasting |
| WH | White |
| WI | Within |
| WID | Width or wide |
| WIE | With immediate effect or effective immediately |
| WILCO† | Will comply |
| WIND | Wind |
| WIP | Work En 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 |
| 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 | |
| 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 | |
| Y | Yellow |
| YCZ | Yellow caution zone (runway lighting) |
| YE | Yellow |
| 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 | |
| Z | Co-ordinated universal time (in meteorological messages) |