Abbreviations marked by an asterisk (*) are either different from or not contained in ICAO Doc 8400.
| 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 | Amber |
| A/A | Air-to-air |
| AAL | Above aerodrome level |
| ABM | Abeam |
| ABN | Aerodrome beacon |
| ABT | About |
| ABV | Above |
| AC | Altocumulus |
| ACARS | 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 |
| ACR | Aircraft classification rating |
| ACP | Acceptance (message type designator) |
| 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 |
| ADR | Advisory route |
| ADS | Automatic dependent surveillance |
| ADSU | Automatic dependent surveillance unit |
| ADVS | Advisory service |
| AES | Aircraft earth station |
| AFIL | Flight plan filed in the air |
| AFI* | Africa − Indian Ocean |
| AFIS | Aerodrome flight information service |
| AFM | Yes or affirm or affirmative or that is correct |
| AFS | Aeronautical fixed service |
| AFTN | Aeronautical fixed telecommunication network |
| A/G | Air-to-ground |
| AGA | Aerodromes, air routes and ground aids |
| AGL | Above ground level |
| AGMC* | Aerodrome ground movement chart |
| AIC | Aeronautical information circular |
| AIM | Aeronautical information management |
| AIP | Aeronautical information publication |
| AIRAC | Aeronautical information regulation and control |
| AIREP | Air-report |
| ARINC | Aeronautical Radio, Incorporated |
| 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 |
| 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) |
| AIP AMDT | Amendment (AIP Amendment) |
| AMS | Aeronautical mobile service |
| AMSL | Above mean sea level |
| ANC | Aeronautical chart - 1:500 000 (followed by name/title) |
| AO* | Aircraft operator |
| AOC | Aerodrome obstacle chart (followed by name/title) |
| AP | Airport |
| 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 |
| APV | Approve or approved or approval |
| APT* | Receiver for satellite cloud pictures |
| ARFOR* | Area forecast (in aeronautical meteorological code) |
| ARO | Air traffic services reporting office |
| ARP | Aerodrome reference point |
| ARP | Air-report (message type designator) |
| ARR | Arrival (message type designator) |
| ARR | Arrive or Arrival |
| ARS | Special air-report (message type designator) |
| AS | Altostratus |
| ASC | Ascend to or ascending to |
| ASDA | Accelerate-stop distance available |
| ASM* | Airspace management |
| 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) |
| ATCSMA* | ATC Surveillance Minimum Altitude |
| ATD | Actual time of departure |
| ATFM | Air traffic flow management |
| ATIS | Automatic terminal information service |
| ATM | Air traffic management |
| ATN | Aeronautical telecommunication network |
| ATS | Air traffic services |
| ATTN | Attention |
| ATZ | Aerodrome traffic zone |
| AUG | August |
| AUP* | Airspace use plan |
| AUTH | Authorized or authorization |
| AUW | All up weight |
| AUX | Auxiliary |
| AVASIS* | Abbreviated visual approach slope indicator system |
| AVBL | Available or availability |
| AVG | Average |
| AVGAS | Aviation gasoline |
| 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 | Blue |
| BA | Braking action |
| BALTIC FRA * | BALTIC FAB free route airspace |
| BASE | Cloud base |
| BC* | Localizer Back Course |
| BCFG | Fog patches |
| BCN | Beacon (aeronautical ground light) |
| BCST | Broadcast |
| BDRY | Boundary |
| BECMG | Becoming |
| BFR | Before |
| BKN | Broken |
| BL... | Blowing (followed by DU=dust, SA=sand, SN=snow) |
| BLDG | Building |
| BR | Mist |
| BRG | Bearing |
| BRKG | Braking |
| B RNAV* | Basic area navigation |
| BS | Commercial broadcasting station |
| BTL | Between layers |
| BTN | Between |
| . - 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 (preceded by runway designation number to identify a parallel runway) |
| 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 | Degrees Celsius (Centigrade) |
| CAA* | Civil Aviation Authority |
| CAC* | Circling Approach Chart |
| CAG (ZLS)* | Cable Arresting Gear |
| CAT | Category |
| CAT | Clear air turbulence |
| CAVOK | Visibility, cloud and present weather better than prescribed values or conditions |
| CB | Cumulonimbus |
| CC | Cirrocumulus |
| CCA* | Counter Clockwise arc |
| CDR* | Conditional route |
| CDN | Coordination (message type designator) |
| CH | Channel |
| CHG | Modification (message type designator) |
| CHMI (ČHMÚ) * | Czech Hydrometeorogical Institute |
| CI | Cirrus |
| CIDIN | Common ICAO data interchange network |
| CIT | Near or over large towns |
| CIV | Civil |
| CK | Check |
| CL | Centre line |
| CLA | Clear type of ice formation |
| CLBR | Calibration |
| CLD | Cloud |
| CLR | Clear or cleared to … or clearance |
| 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 |
| COM | Communications |
| CONC | Concrete |
| COND | Condition |
| CONS | Continuous |
| CONST | Construction or constructed |
| CONT | Continue or continued |
| COOR | Co−ordinate or co−ordination |
| COP | Change-over point |
| COR | Correct or corrected or correction (used to indicate corrected meteorological message; message type indicator) |
| COV | Cover or covered or covering |
| CPDLC | Controller-pilot data link communications |
| CPL | Current flight plan (message type designator) |
| CR (ČR)* | The Czech Republic |
| CRZ | Cruise |
| CS | Call sign |
| CS | Cirrostratus |
| CTA | Control area |
| CTC | Contact |
| CTOT | Calculated Take−Off Time |
| CTL | Control |
| CTN | Caution |
| CTR | Control zone |
| CU | Cumulus |
| CUF | Cumuliform |
| CUST | Customs |
| CVR | Cockpit voice recorder |
| CVSM | Conventional vertical separation minimum |
| CWA* | Clockwise arc |
| CWY | Clearway |
| CZ* | Czech language |
| 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... | Danger area (followed by identification) |
| D | Downward (tendency in RVR during previous 10 minutes) |
| D* | Self−briefing display |
| DA | Decision altitude |
| DCKG | Docking |
| DCL | Datalink Departure Clearance Service |
| DCT | Direct (in relation to flight plan clearances and type of approach) |
| DEC | December |
| DEG | Degrees |
| DEP | Depart or departure |
| DEP | Departure (message type designator) |
| DES | Descend to or descending to ... |
| DEST | Destination |
| DETRESFA | Distress phase |
| DEV | Deviation or deviating |
| DFDR | Digital flight data recorder |
| DFTI | Distance from touchdown indicator |
| DH | Decision height |
| DIF | Diffuse |
| DIST | Distance |
| DIV | Divert or diverting |
| DLA | Delay (message type designator) |
| DLA | Delay or delayed |
| DLS* | Data link service |
| DLY | Daily |
| DME | Distance measuring equipment |
| DNG | Danger or dangerous |
| 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 |
| DTG | Date-time group |
| DTRT | Deteriorate or deteriorating |
| DU | Dust |
| DUR | Duration |
| DVOR | Doppler VOR |
| 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 |
| EANPG* | European air navigation planning group |
| EATMS* | European air traffic management system |
| EB | Eastbound |
| ECAC* | European civil aviation conference |
| EET | Estimated elapsed time |
| EHF | Extremely high frequency (30 000 to 300 000 MHz) |
| ELBA | Emergency location beacon-aircraft |
| ELEV | Elevation |
| ELR | Extra long range |
| EM | Emission |
| EMBD | Embedded in a layer (to indicate cumulonimbus embedded in layers of other clouds) |
| EMERG | Emergency |
| EN* | English language |
| END | Stop-end (related to RVR) |
| ENE | East-north-east |
| ENG | Engine |
| ENR | Enroute |
| ENRC | Enroute chart (followed by name/title) |
| EOBD | Estimated off−block date |
| EOBT | Estimated off-block time |
| EQPT | Equipment |
| EPNdB* | Unit of effective perceived noise level |
| EPNL* | Effective perceived noise level |
| 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 |
| ETO | Estimated time over significant point |
| ETOT | Estimated Take−Off Time |
| EU* | the European Union |
| EUR* | European Region |
| EV | Every |
| EXC | Except |
| EXER | Exercises or exercising or to exercise |
| EXP | Expect 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 |
| FAC | Facilities |
| FAF | Final approach fix |
| FAL | Facilitation of international air transport |
| FAP | Final approach point |
| 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) |
| FBZ* | Flight Planning Buffer Zone |
| FC | Funnel cloud (tornado or water spout) |
| FCST | Forecast |
| FCT | Friction coefficient |
| FDP* | Flight data processing |
| FEB | February |
| 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 |
| FLT | Flight |
| FLTCK | Flight check |
| FLUC | Fluctuating or fluctuation or fluctuated |
| FLW | Follow(s) or following |
| FLY | Fly or flying |
| FM | From |
| FM... | From (followed by time weather change is forecast to begin) |
| FMS | Flight management system |
| FMU | Flow management unit |
| FNA | Final approach |
| FPL | Filed flight plan (message type designator) |
| FPM | Feet per minute |
| FPR | Flight plan route |
| FR | Fuel remaining |
| FR* | French language |
| FRA | Free Route Airspace |
| FREQ* | Frequency or frequency channel |
| FRI | Friday |
| FRNG | Firing |
| FRONT | Front (relating to weather) |
| FRQ | Frequent |
| FSL | Full stop landing |
| FSS | Flight service station |
| FST | First |
| FT | Feet (dimensional unit) |
| FU | Smoke |
| FUA* | Flexibile use of airspace |
| 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/A | Ground-to-air |
| G/A/G | Ground-to-air and air-to-ground |
| GA* | General aviation |
| GAMET | Area forecast for low-level flights |
| GAT | General air traffic |
| GCA | Ground controlled approach system or ground controlled approach |
| GEN | General |
| GEO | Geographic or true |
| GER* | German language |
| GES | Ground earth station |
| GLD | Glider |
| GLONASS | Global orbiting navigation satellite system (to be pronounced "GLO−NAS") |
| GMC | Ground movement chart (followed by name/title) |
| GND | Ground |
| GNDCK | Ground check |
| GNSS | Global navigation satellite system |
| GP | Glide path |
| GPS | Global positioning system |
| GPU | Ground power unit |
| GR | Hail |
| GRC* | Orthodrome (great circle) |
| GRASS | Grass landing area |
| 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 | |
| H | High pressure area or the centre of high pressure |
| H24 | Continuous day and night service |
| HAPI | Helicopter approach path indicator |
| HBN | Hazard beacon |
| HDF | High frequency direction-finding station |
| HDG | Heading |
| HEL | Helicopter |
| HEMS* | Helicopter Emergency Medical Service |
| HF | High frequency (3 000 to 30 000 KHz) |
| HGT | Height or height above ... |
| HJ | Sunrise to sunset |
| HLDG | Holding |
| HN | Sunset to sunrise |
| HO | Service available to meet operational requirements |
| HOL | Holiday |
| HOSP | Hospital aircraft |
| HPA | Hectopascal |
| HR | Hours |
| HS | Service available during hours of scheduled operations |
| 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 |
| 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 (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 air speed |
| IATA | International Air Transport Association |
| 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 |
| IFPS* | Initial Flight Plan Processing System |
| IFR | Instrument flight rules |
| IGA | International general aviation |
| ILS | Instrument landing system |
| IM | Inner marker |
| IMC | Instrument meteorological conditions |
| IMG | Immigration |
| 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 |
| ISA | International standard atmosphere |
| ISO* | International organisation for standartisation |
| 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 | |
| JAA* | Joint Aviation Authorities |
| JAN | January |
| JAR* | Joint Aviation Requirements |
| 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 | Kilogrammes |
| KHZ | Kilohertz |
| KM | Kilometres |
| KMH | Kilometres per hour |
| KPA | Kilopascal |
| KT | Knots |
| KW | Kilowatts |
| . - 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 - 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 | Locator (see LM, LO) |
| LAM | Logical acknowledgement (message type designator) |
| LARS* | Local Activity Reservation System |
| LAT | Latitude |
| LCA | Local or locally or location or located |
| LDA | Landing distance available |
| LDAH | Landing distance available, helicopter |
| LDG | Landing |
| LDI | Landing direction indicator |
| LEN | Length |
| LF | Low frequency (30 to 300 KHz) |
| LFA (MLČ)* | Local flight activity |
| LGT | Light or lighting |
| LGTD | Lighted |
| LIH | Light intensity high |
| LIL | Light intensity low |
| LIM | Light intensity medium |
| LM | Locator, middle |
| LMT | Local mean time |
| LNG | Long (used to indicate the type of approach desired or required) |
| LO | Locator, outer |
| LOC | Localizer |
| LONG | Longitude |
| LRG | Long range |
| LTD | Limited |
| LV | Light and variable (relating to wind) |
| LVE | Leave or leaving |
| LVL | Level |
| LVP | Low Visibility Procedures |
| LYR | Layer or layered |
| LVTO | Low Visibility Take−Off |
| LZS* | Air rescue service |
| 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 | Mach number (followed by figures) |
| M | Metres (preceded by figures) |
| MAA | Maximum authorized altitude |
| MAG | Magnetic |
| MAINT | Maintenance |
| MAP | Aeronautical maps and charts |
| MAPP* | Military approach control unit |
| MAPT | Missed approach point |
| MAR | March |
| MARO* | Military air traffic services reporting office |
| MAX | Maximum |
| MAY | May |
| MCA | Minimum crossing altitude |
| MCTR* | Military control zone |
| MDA | Minimum descent altitude |
| 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 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 3000 KHz) |
| 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) |
| MID* | Middle and Far−East |
| MIFG | Shallow fog |
| MIL | Military |
| MIN | Minutes |
| MKR | Marker radio beacon |
| MLAT* | Multilateration |
| MLČ (LFA)* | Local flight activity |
| MLS | Microwave landing system |
| MM* | Middle marker |
| MNM | Minimum |
| MNPS | Minimum navigation performance specifications |
| MNTN | Maintain |
| MOA | Military operating area |
| MOC | Minimum obstacle clearance (required) |
| MOD | Moderate (used to indicate the intensity of weather phenomena, interference or static reports, e.g. MOD RA=moderate rain) |
| MON | Monday |
| MOPS | Minimum operational performance standards |
| MOTNE | Meteorological Operational Telecommunications Network Europe |
| MOV | Move or moving or movement |
| MPS | Metres per second |
| MRA | Minimum reception altitude |
| MRG | Medium range |
| MRP | ATS/MET reporting point |
| MRVA* | Minimum radar vectoring altitude |
| MS | Minus |
| MSA | Minimum sector altitude |
| MSG | Message |
| MSL | Mean sea level |
| MTMA* | Military terminal control area |
| MTOM* | Maximum take−off mass |
| MTOW* | Maximum take−off weight |
| MTU | Metric units |
| MTW | Mountain waves |
| MTWR* | Military aerodrome control tower |
| MVDF | Medium and very high frequency direction-finding stations (at the same locations) |
| 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 | |
| N | North or northern latitude |
| N | No distinct tendency (in RVR during previous 10 minutes) |
| NAG (ZSS)* | Net Arresting Gear |
| NaPoSy PVO ČR* | National Reinforcing Air Defence System of the Czech Republic |
| NAT | North Atlantic |
| NATINAMDS* | NATO Integrated Air and Missile Defence System |
| NATO* | North Atlantic Treaty Organization |
| NAV | Navigation |
| NB | Northbound |
| NC | No change |
| NDB | Non-directional radio beacon |
| 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 | Nautical miles |
| NMOC* | Network Manager Operations Centre |
| NML | Normal |
| NNE | North-north-east |
| NNW | North-north-west |
| NOF | International NOTAM office |
| NOSIG | No significant change (used in trend-type landing forecasts) |
| NOTAM | A 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 concerning with flight operations |
| NOV | November |
| NPZ* | Non – standard planning zone |
| NR | Number |
| NS | Nimbostratus |
| NSC | Nil significant cloud |
| NSW | Nil significant weather |
| 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 | |
| OAC | Oceanic area control centre |
| OAS | Obstacle assessment surface |
| OAT* | Operational air traffic |
| OBS | Observe or observed or observation |
| OBSC | Obscure or obscured or obscuring |
| OBST | Obstacle |
| OCA | Obstacle clearance altitude |
| OCA | Oceanic control area |
| OCH | Obstacle clearance height |
| OCL* | Obstacle clearance limit |
| OCNL | Occasional or occasionally |
| OCS | Obstacle clearance surface |
| OCT | October |
| OFZ | Obstacle free zone |
| OHD | Overhead |
| 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 |
| O/R | On request |
| OTLK | Outlook |
| OTP | On top |
| 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 | |
| P* | Prognostic upper air chart |
| P* | Personal consultation |
| 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) |
| PCD | Proceed or proceeding |
| PCL | Pilot-controlled lighting |
| PCN | Pavement classification number |
| PCR | Pavement classification rating |
| PDC* | Aircraft parking/docking chart |
| PDG | Procedure design gradient |
| PER | Performance |
| PERM | Permanent |
| PG/HG (PK/ZK)* | parachute glider / hang glider |
| PGZ* | paragliding zone − area for tow winch of parachute and hang glider |
| PIB | Pre-flight information bulletin |
| PJE | Parachute jumping exercise |
| PL | Ice pellets |
| PL* | Abbreviated plain language texts |
| PLA | Practice low approach |
| PLN | Flight plan |
| PLVL | Present level |
| PN | Prior notice required |
| PNR | Point of no return |
| PO | Dust devils |
| 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 |
| PRKG | Parking |
| PROB | Probability |
| PROC | Procedure |
| PROV | Provisional |
| PS | Plus |
| PSG | Passing |
| PSN | Position |
| PSR | Primary surveillance radar |
| PTN | Procedure turn |
| 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 | |
| QDM | Magnetic heading (zero wind) |
| QDR | Magnetic bearing |
| QFE | Atmospheric pressure at aerodrome elevation (or at runway threshold) |
| QFU | Magnetic orientation of runway |
| QNH | Altimeter sub-scale setting to obtain elevation when on the ground |
| QTE | True bearing |
| QUAD | Quadrant |
| 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 | Red |
| . - 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 | Right (preceded by runway designation number to identify a parallel runway) |
| 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... | Restricted area (followed by identification) |
| RA | Rain |
| RAC | Rules of the air and air traffic services |
| RADIM* | Radio Information Beacon |
| RADV* | Minimum radar vectoring altitude chart |
| RAG | Ragged |
| RAG | Runway arresting gear |
| RAI | Runway alignment indicator |
| RAIM | Receiver autonomous integrity monitoring |
| RB | Rescue boat |
| RCA | Reach cruising altitude |
| RCC | Rescue coordination centre |
| RCF | Radiocommunication failure (message type designator) |
| RCH | Reach or reaching |
| RCL | Runway centre line |
| RCLL | Runway centre line light(s) |
| RCLR | Recleared |
| RDH | Reference datum height |
| RDL | Radial |
| RDO | Radio |
| RDP | Radar data processing |
| RE... | Recent (used to qualify weather phenomena, e. g. RERA=recent rain) |
| REC | Receive or receiver |
| REDL | Runway edge light(s) |
| REF | Reference to … or refer to... |
| REG | Registration |
| REG* | Regional |
| RENL | Runway end light(s) |
| REP | Report or reporting or reporting point |
| REQ | Request or requested |
| RERTE | Re-route |
| RESA | Runway end safety area |
| RFFS | Rescue and fire fighting services |
| RG | Range (lights) |
| RHC | Right-hand circuit |
| RIF | Reclearance in flight |
| RL | Report leaving |
| RLA | Relay to |
| RLLS | Runway lead-in lighting system |
| RMAC | Radar minimum altitude chart |
| RMK | Remark |
| RMZ* | Radio mandatory zone |
| 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 |
| ROFOR | Route forecast (in meteorological code) |
| RPA* | Remotely piloted aircraft |
| RPAS* | Remotely piloted aircraft system |
| RPL | Repetitive flight plan |
| RPLC | Replace or replaced |
| RPS | Radar position symbol |
| RPS* | Remote pilot station |
| RQMNTS | Requirements |
| RQP | Request flight plan (message type designator) |
| RQS | Request supplementary flight plan (message type designator) |
| RR | Report reaching |
| RRA | Delayed meteorological message (or RRB, RRC ... etc., in sequence) (message type designator) |
| RSC | Rescue sub-centre |
| RSCD | Runway surface condition |
| RSP | Responder beacon |
| RSR | En-route surveillance radar |
| 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) |
| RUS* | Russian language |
| RUT | Standard regional route transmitting frequencies |
| RV | Rescue vessel |
| RVR | Runway visual range |
| RVSM* | Reduced vertical separation minimum (300 m (1000 ft)) between FL 290 and FL 410 |
| 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* | Surface analysis (current chart) |
| S | South or southern latitude |
| SA | Sand |
| SALS | Simple approach lighting system |
| SAN | Sanitary |
| SAP | As soon as possible |
| SAR | Search and rescue |
| SARPS | Standards and Recommended Practices (ICAO) |
| SAT | Saturday |
| SATCOM | Satellite communication |
| SB | Southbound |
| SC | Stratocumulus |
| SCT | Scattered |
| SDBY | Stand by |
| SDF* | Stepdown fix |
| SDR* | Special drawing rights |
| SE | South-east |
| SEB | South-eastbound |
| SEC | Seconds |
| SECSI FRA* | South East Common Sky Initiative Free Route Airspace |
| SECT | Sector |
| SEE FRA* | South East Europe Free Route Airspace |
| SELCAL | Selective calling system |
| SEP | September |
| SER | Service or servicing or served |
| SERA* | Standardized European Rules of the Air |
| 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, 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) |
| SID | Standard instrument departure |
| SIF | Selective identification feature |
| SIGMET | Information concerning en-route weather phenomena which may affect the safety of aircraft operations |
| SIGWX* | Significant weather |
| SIMUL | Simultaneous or simultaneously |
| SITA | Airline Telecommunication and Information Service |
| SIWL | Single isolated wheel load |
| SKC | Sky clear |
| SKED | Schedule or scheduled |
| SLP | Speed limiting point |
| S LPS* | Air traffic services unit |
| SLW | Slow |
| SLZ* | Sport Flying Equipment |
| SMC | Surface movement control |
| SMR | Surface movement radar |
| SN | Snow |
| SNOWTAM | A special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of a specific format |
| SPA* | Spanish language |
| SPECI | Aerodrome special meteorological report (in meteorological code) |
| SPECIAL | Local special meteorological report (in abbreviated plain language) |
| SPL | Supplementary flight plan (message type designator) |
| 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 |
| 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 |
| SVCBL | Serviceable |
| SW | South-west |
| SWB | South-westbound |
| SWH* | Significant weather chart − high level |
| SWL* | Significant weather chart − low level |
| SWM* | Significant weather chart − medium level |
| SWY | Stopway |
| SZZ* | Lighting system |
| 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 | Temperature |
| T* | Tropopause chart |
| TA | Transition altitude |
| TACAN | UHF tactical air navigation aid |
| TAF | Aerodrome forecast (in meteorological code) |
| TAIL | Tail wind |
| TAR | Terminal area surveillance radar |
| TAS | True airspeed |
| TAX | Taxiing or taxi |
| TB* | Beginning of civil morning twilight |
| TC | Tropical cyclone |
| TCAS | Traffic alert and collision avoidance system |
| TCU | Towering cumulus |
| TDO | Tornado |
| TDZ | Touchdown zone |
| TE* | End of civil twilight |
| TECR | Technical reason |
| TEL | Telephone |
| TEMPO | Temporary or temporarily |
| TFC | Traffic |
| TGL | Touch-and-go landing |
| TGL* | Temporary Guidance Leaflet |
| TGS | Taxiing guidance system |
| THR | Threshold |
| THRU | Through |
| THU | Thursday |
| TIL | Until |
| TIP | Until past … (place) |
| 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 |
| TNA | Turn altitude |
| TNH | Turn height |
| TO | To … (place) |
| TOC | Top of climb |
| TODA | Take-off distance available |
| TODAH | Take-off distance available, helicopter |
| TOP | Cloud top |
| TORA | Take-off run available |
| TP | Turning point |
| TR | Track |
| TRA* | Temporary reserved area |
| TRA GA* | Temporary reserved area designated for operations of general aviation |
| TRANS | Transmits or transmitter |
| TREND | Trend forecast |
| 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 |
| TTO | Target time over |
| TUE | Tuesday |
| TURB | Turbulence |
| TVOR | Terminal VOR |
| TWR | Aerodrome control tower or aerodrome control |
| TWY | Taxiway |
| TWYL | Taxiway-link |
| 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 | Upward (tendency in RVR during previous 10 minutes) |
| U* | Upper air analysis (current chart) |
| 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 3 000 MHz) |
| UIC | Upper information centre |
| UIR | Upper flight information region |
| ULR | Ultra long range |
| UNA | Unable |
| UNAP | Unable to approve |
| UNL | Unlimited |
| UNREL | Unreliable |
| U/S | Unserviceable |
| UTA | Upper control area |
| UTC | Coordinated Universal Time |
| UTM* | Unmanned aircraft traffic management |
| UUP* | Update use plan |
| UPS* | Uninterruptible power supply |
| 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 | |
| VA | Volcanic ash |
| VAC | Visual approach chart (followed by name/title) |
| VAL | In valleys |
| VAN | Runway control van |
| VAR | Visual−aural radio range |
| VAR | Magnetic variation |
| VASIS | Visual approach slope indicator systems |
| VC | Vicinity of aerodrome (followed by FG=fog, FC=funnel cloud, SH=showers, PO=dust/sand whirls, BLDU=blowing dust, BLSA=blowing sand, BLSN=blowing snow, DS=duststorm, SA=sandstorm, TS=thunderstorm or VA=volcanic ash e.g. VCFG = vicinity fog) |
| VCY | Vicinity |
| VDF | Very high frequency direction-finding station |
| VDGS* | Visual Docking Guidance System |
| VER | Vertical |
| VFR | Visual flight rules |
| VFRC* | VFR Arrivals and Departures Chart |
| VHF | Very high frequency (30 to 300 MHz) |
| VIP | Very important person |
| VIS | Visibility |
| VLF | Very low frequency (3 to 30 KHz) |
| VLR | Very long range |
| VMC | Visual meteorological conditions |
| VOC | Visual operations chart |
| 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 |
| VTOL | Vertical take-off and landing |
| 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 | West or western longitude |
| W | White |
| WAC | World Aeronautical Chart - ICAO 1 : 1 000 000 (followed by name/title) |
| WAFC | World area forecast centre |
| WAM* | Wide Area Multilateration System |
| 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 |
| WIE | With immediate effect or effective immediately |
| WILCO | Will comply |
| 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 |
| 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 | |
| X | Cross |
| XBAR | Crossbar (of approach lighting system) |
| XNG | Crossing |
| XS | Atmospheric |
| 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) |
| YD* | Yards |
| 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 | Coordinated Universal Time (in meteorological messages) |
| - 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 | |
| Symbols | |
| * | Address |
| ( - 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 | |
| ( | Telephone |
| 7 - 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 | |
| 7 | Fax |
| - 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−mail |
| þ - 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 | |
| þ | Internet address |
| - 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 | |