### GEN 2.2 ABBREVIATIONS USED IN AIS PUBLICATIONS

+: Abbreviations annotated by “+” are not included in ICAO Doc 8400.
†: When radiotelephony is used, the abbreviations and terms annotated by “†”, 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 GLOSSARY OF TERMS
A | Amber
A2A | +Amplitude modulation, Designation of emissions
A3E | +Amplitude modulation, Designation of emissions
A8W | +Amplitude modulation, Designation of emissions
A9W | +Amplitude modulation, Designation of emissions
AAA | (Or AAB, AAC... etc. in sequence) Amended meteorological message (message type designator)
A/A | Air-to-air
AAD | Assigned altitude deviation
AAIM | Aircraft autonomous integrity monitoring
AAL | Above aerodrome level
AAR | Air to air refuelling
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
ACCC | +Air Command and Control Centre
ACCID | Notification of an aircraft accident
A-CDM | +Airport Collaborative Decision Making
ACFT | Aircraft
ACK | Acknowledge
ACL | Altimeter check location
ACL | +ATC clearances and instructions
ACM | +ATC communications management
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
ADF | Automatic direction finding equipment
ADIZ | †(to be pronounced “AY-DIZ”) Air defence identification zone
ADJ | Adjacent
ADO | Aerodrome office (specify service)
ADQ | +Aeronautical Data Quality
ADR | Advisory route
ADS | +Automatic dependent surveillance
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
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
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 | +ATC microphone check
AMC | +Acceptable Means of Compliance
AMD | Amend or amended (used to indicate amended meteorological message; message type designator)
AMDT | Amendment (AIP amendment)
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)
ANS | Answer
AO | +Aircraft Operators
AOC | Aerodrome obstacle chart ... (followed by type and name / title)
AOC | +Air Operation Centre
AOC | +Air Operator Certificate – according to EC Regulation 965/2012
AOCC | +Airport Operations Control Centre
AOO | +Airfield Operations Officer
AOR | +Area of responsibility
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
APU | Auxiliary Power Unit
APV | Approach procedure with vertical guidance
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 | Arrive or arrival
ARR | Arrival (message type designator)
ARS | Special air-report (message type designator)
ARST | Arresting (specify (part of) aircraft arresting equipment)
AS | Altostratus
ASAP | As soon as possible
ASARAS | +Air Search and Rescue Alert Service
ASC | Ascend to or ascending to
ASDA | Accelerate-stop distance available
ASE | Altimetry system error
ASHTAM | A special series 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
ASMGCS | +Advanced Surface Movement Guidance and Control System
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)
ATCC | +Air Traffic Control Centre
ATCSMAC | Air Traffic Control Surveillance Minimum Altitude Chart ... (followed by name/title)
ATD | Actual time of departure
ATFCM | +Air traffic flow and capacity management
ATFM | Air traffic flow management
ATFMP | +Air traffic flow management position
ATFMU | +Air traffic flow management unit
ATIS | †(to be pronounced “AY-TIS”) Automatic terminal information service
ATM | Air traffic management
ATN | Aeronautical telecommunication network
ATP | +Allied Tactical Publication
ATP | At ... (time or place)
ATS | Air traffic services
ATSU | +Air traffic service unit
ATTN | Attention
AT-VASIS | †(to be pronounced “AY-TEE-VASIS”) Abbreviated T visual approach slope indicator system
ATZ | Aerodrome traffic zone
AUG | August
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
BARO-VNAV | †(to be pronounced “BAA-RO-VEENAV”) Barometric vertical navigation
BASE | †Cloud base
BCFG | Fog patches
BCN | Beacon (aeronautical ground light)
BCST | Broadcast
BDRY | Boundary
BECMG | Becoming
BFR | Before
BIP | +Border Inspection Point
BKN | Broken
BL | Blowing ... (followed by DU = dust, SA = sand or SN = snow)
BLDG | Building
BLO | Below clouds
BLW | Below...
BOMB | Bombing
BoMCT | +Beginning of morning civil twilight
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
BSRF | +Bird Strike Reporting Form
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 GLOSSARY OF TERMS
C | ... Centre (preceded by runway designation number to identify a parallel runway)
C | Degrees Celsius (centigrade)
CA | Course to an altitude
CAA | Civil Aviation Authority or civil aviation administration
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
CC | Cirrocumulus
CC | +Condition Code
CCA | (or CCB, CCC... etc., in sequence) Corrected meteorological message (message type designator)
CCO | Continuous climb operations
CD | Candela
CDN | Coordination (message type designator)
CDO | Continuous descent operations
CDR | Conditional Route
CEATS | +Central European Air Traffic Services
CET | +Central European Time
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)
CHEM | Chemical
CHG | Modification (message type designator)
CI | Cirrus
CIDIN | †Common ICAO data interchange network
CIT | +Near or over large towns
CITES | +Convention on International Trade in Endangered Species of Wild Fauna and Flora
CIV | Civil
CK | Check
CL | Centre line
CLA | Clear type of ice formation
CLBR | Calibration
CLD | Cloud
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
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)
CRC | Cyclic redundancy check
CRM | Collision risk model
CRP | Compulsory reporting point
CRZ | Cruise
CS | Cirrostratus
CS | Call sign
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)
D - ATIS | †(to be pronounced “DEE – ATIS”) Data link automatic terminal information service
D - VOLMET | Data link VOLMET
DA | Decision altitude
DAM | +Duty Airside Manager
DAP | +Downlinked Aircraft Parameter
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)
DD | +Decimal degrees; a notation for expressing latitude and longitude geographic coordinates as decimal fractions of a degree.
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 touch down indicator
DGCA | +Director General of Civil Aviation
DH | Decision height
DHDG | +Downlinked Magnetic Heading
DIAS | +Downlinked Indicated Air Speed
DIF | Diffuse
DIST | Distance
DIV | Divert or diverting
DLA | Delay or delayed
DLA | Delay (message type designator)
DLIC | Data link initiation capability
DLY | Daily
DMACH | +Downlinked Mach Number
DME | Distance measuring equipment
DMS | +Degrees, Minutes, Seconds; a system for expressing geographic coordinates by dividing a circle into 360 degrees, with each degree further divided into 60 minutes, and each minute into 60 seconds. This format uses symbols for degrees (°), minutes (') and seconds (“) and specifies location with a latitude and longitude pair, often including a North/South and East/West direction.
DNG | Danger or dangerous
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
DRC | +Downlinked Rate of Climb/Descend
DRG | During
DS | Duststorm
DSB | Double sideband
DSFL | +Downlinked Selected Flight Level
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
DVD | +Digital Versatile Disc
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 GLOSSARY OF TERMS
E | East or eastern longitude
EASA | +European Aviation Safety Agency
EAT | Expected approach time
EB | Eastbound
ECAA | +European Common Aviation Area
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
eFPL | Filed flight plan exchanged via flight and flow — information for a collaborative environment (FF-ICE) services
EFTA | +European Free Trade Association
EGM | +Earth Gravitational Model 1996
EGNOS | (to be pronounced “EGG-NOS”) European geostationary navigation overlay service
EHF | Extremely high frequency (30 000 to 300 000 MHZ)
EHS | +Enhanced Surveillance
ELBA | Emergency location beacon — aircraft
ELEV | Elevation
ELR | Extra long range
ELS | +Elementary Surveillance
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 | En route chart ... (followed by name/title)
EOBT | Estimated off-block time
EoECT | +End of evening civil twilight
EQN | Equatorial latitudes northern hemisphere
EQPT | Equipment
EQS | Equatorial latitudes southern hemisphere
ER | *Here...or herewith
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
EU | +European Union
EUR | +Euros
EUR RODEX | European regional OPMET data exchange
EV | Every
EVS | Enhanced vision system
EXC | Except
EXER | Exercises or exercising or to exercise
EXP | Expect or expected or expecting
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
FANS | +Future Data Link
FAP | Final approach point
FAS | Final approach segment
FATO | Final approach and take-off area
FAWP | +Final approach waypoint
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 waterspout)
FCST | Forecast
FCT | Friction coefficient
FDPS | Flight data processing system
FEB | February
FEW | Few
FFR | +Flood, Fire, Relief
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 | Course from a fix to manual termination (used in navigation database coding)
FM | From
FM | From ... (followed by time at which weather change is forecast to begin)
FMC | Flight management computer
FMP | +Flow management position
FMS | ‡Flight management system
FMU | Flow management unit
FNA | Final approach
FOD | +Foreign Object Debris
FPAP | Flight path alignment point
FPL | Filed flight plan exchanged via aeronautical fixed service (AFS)
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
FUA | +Flexible 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 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
GAT | +General air traffic
GBAS | (to be pronounced “GEE-BAS”) Ground-based augmentation system
GCA | Ground controlled approach system or ground controlled approach
GDCA | +General Directorate of Civil Aviation
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
GRAS | (to be pronounced “GRASS”) Ground-based regional augmentation system
GRASS | Grass landing area
GRF | +Global Reporting Format
GRIB | Processed meteorological data in the form of grid point values expressed in binary form (meteorological code)
GRN | +Green
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 | 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
HDFC | +Hungarian Defence Forces Command
HDG | Heading
HEL | Helicopter
HF | Holding/racetrack to a fix
HF | High frequency (3 000 to 30 000 KHZ)
HGT | Height or height above
HIAL | +High intensity approach lights
HIRL | +High intensity runway lights
HJ | Sunrise to sunset
HLDG | Holding
HLP | Heliport
HLS | Helicopter landing site
HM | Holding/racetrack to a manual termination
HN | Sunset to sunrise
HNG | +Hungarian or Hungary
HNH | High latitudes northern hemisphere
HO | Service available to meet operational requirements
HOL | Holiday
HOSP | Hospital aircraft
HPA | Hectopascal
HR | Hours
HRP | Heliport reference point
HS | Service available during hours of scheduled operations
HSH | High latitudes southern hemisphere
HU | +Hungarian
HUD | Head-up display
HUF | +Hungarian Forints
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)
HWS | +Horizontal wind shear
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
IAIP | +Integrated Aeronautical Information Package
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
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
IFPS | +Integrated 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
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
INCORP | Incorporated
INFO | †Information
INOP | Inoperative
INP | If not possible
INPR | In progress
INS | Inertial navigation system
INS | +Inches
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 GLOSSARY OF TERMS
JAA | +Joint Aviation Authorities
JAN | January
JFC | +Joint Forces Command
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
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)
LGT | Light or lighting
LGTD | Lighted
LI | +Locator inner
LIH | Light intensity high
LIL | Light intensity low
LIM | Light intensity medium
LINE | Line (used in SIGMET)
LLZ | +Localizer
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
LONG | Longitude
LORAN | Long range air navigation system
LOSS | Airspeed or headwind loss
LPV | Localizer performance with vertical guidance
LR | 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)
LT | +Local Time
LTA | Lower control area
LTD | Limited
LTF | +Land line telephone
LTP | Landing threshold point
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 GLOSSARY OF TERMS
M | ... Metres (preceded by figures)
M | Mach number ... (followed 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
MAP | Aeronautical maps and charts
MAPT | Missed approach point
MAR | March
MAR | At sea
MAS | +Manual A1 simplex
MATF | Missed approach turning fix
MATZ | Military aerodrome traffic zone
MAX | Maximum
MAY | May
MBST | Microburst
MCA | Minimum crossing altitude
MCTR | Military control zone
MCW | Modulated continuous wave
MDA | Minimum descent altitude
MDD | +Main Duty Department
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
MET REPORT | Local routine meteorological report (in abbreviated plain language)
METAR | †Aerodrome routine meteorological report (in meteorological code)
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
MI | +Ministry of the Interior
MID | Mid-point (related to RVR)
MIFG | Shallow fog
MIL | Military
MIN | *Minutes
MIS | Missing … (transmission identification) (to be used in AFS as a procedure signal)
MKR | Marker radio beacon
MLS | Microwave landing system
MM | Middle marker
MMO | +Main Meteorological Office
MNH | Middle latitudes northern hemisphere
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 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 | 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”) Multifunctional transport satellite (MTSAT) satellite-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
MTMA | +Military TMA
MTOM | Maximum take-off mass
MTOW | +Maximum take-off weight
MTSAT | +Multifunctional transport satellite
MTU | Metric units
MTW | Mountain waves
MVA | +Minimum vectoring altitude
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
NAS | +National Ambulance Service
NASARS | +National Air Search and Rescue System
NASC | †National AIS system centre
NAT | North Atlantic
NATO | +North Atlantic Treaty Organisation
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
NDGDM | +National Directorate General for Disaster Management
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
NLA | +National Light Aviation
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
NON | +Designation of non-modulated
NONFUA | +Not subject to Flexible use of airspace
NONSTD | Non-standard
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 concerned with flight operations.
NOTAMC | Cancelling NOTAM
NOTAMN | New NOTAM
NOTAMR | Replacing NOTAM
NOV | November
NOZ | ‡Normal operating zone
NPA | Non-precision approach
NPH | +National Police Headquarters
NPZ | +Non-standard Planning Zone
NR | Number
NRH | No reply heard
NS | Nimbostratus
NS | +Non-Scheduled
NSC | Nil significant cloud
NSE | Navigation system error
NSW | Nil significant weather
NTL | National
NTZ | ‡No transgression zone
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
OAT | +Operational Air Traffic
OAT-C | +Operational Air Traffic – Compatible
OAT-S | +Operational Air Traffic – Special
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
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 It is correct (to be used in AFS as a procedure signal)
OL | +Operating License - according to EC Regulation 1008/2008
OLDI | †On-line data interchange
OLS | +Obstacle Limitation Surface
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
ORD | Order
OSV | Ocean station vessel
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 GLOSSARY OF TERMS
P | Maximum value of wind speed or runway visual range ... (followed by figures in METAR/SPECI and TAF)
P | +Private
P | Prohibited area ... (followed by identification)
P2 | +Prognostic chart for 200 HPA
P3 | +Prognostic chart for 300 HPA
P5 | +Prognostic chart for 500 HPA
P7 | +Prognostic chart for 700 HPA
P85 | +Prognostic chart for 850 HPA
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
PDC | +Parking and Docking Chart
PDF | +Portable Document Format
PDG | Procedure design gradient
PER | Performance
PERM | Permanent
PFP | Preliminary flight plan
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
PON | +Pulse modulation, designation of emissions
POSS | Possible
PPI | Plan position indicator
PPR | Prior permission required
PPSN | Present position
PRFG | Aerodrome partially covered by fog
PRI | Primary
PRKG | Parking
PRM | +Persons with reduced mobility
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
Psw | +Prognostic chart of significant weather
PSYS | Pressure system(s)
PTN | Procedure turn
PTrVM | +Prognostic tropopause and maximum wind chart
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 to ask me for a series of bearings? or I intend to ask 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 D/F 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 designator number to identify a parallel runway)
R | Rate of turn
R | Red
R | Radial from VOR ... (followed by three figures)
R | Restricted area ... (followed by identification)
R | Runway ... (followed by figures in the METAR/SPECI)
R | *Received (acknowledgement of receipt) (to be used in AFS as a procedure signal)
RA | Rain
RA | Resolution advisory
RAC | Rules of the air and air traffic services
RAD | +Route Availability Document
RAG | Ragged
RAG | Runway arresting gear
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
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
RCP | ‡Required communication performance
RCR | +Runway Condition Report
RDH | Reference datum height
RDL | Radial
RDO | Radio
RDOACT | Radioactive
RE | Recent (used to qualify weather phenomena e.g. RE RA = recent rain)
REA | +Ready message
REC | Receive or receiver
REDL | Runway edge light(s)
REF | Reference to... or refer to...
REG | Registration
RENL | Runway end light(s)
REP | Report or reporting or reporting point
REQ | Request or requested
RERTE | Re-route
RESA | Runway end safety area
RF | Constant radius arc to a fix
RFC | +Radio facility chart
RFFS | Rescue and fire fighting services
RFP | +Replacement Flight Plan
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
RLA | Relay to
RLCE | Request level change en route
RLLS | Runway lead-in lighting system
RLNA | Request level not available
RMAC | +Radar minimum altitude chart
RMK | Remark
RMZ | +Radio Mandatory Zone
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
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 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)
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 (1 000 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 GLOSSARY OF TERMS
S | +Scheduled
S | South or Southern latitude
S | State of the sea ... (followed by figures in METAR/SPECI)
S6 | +6-hourly surface synoptic chart
SA | Sand
SALS | Simple approach lighting system
SAN | Sanitary
SAR | Search and rescue
SARPS | Standards and Recommended Practices (ICAO)
SAT | Saturday
SATCOM | †Satellite communication (used only when referring generally to both voice and data satellite communication or only data satellite communication)
SATVOICE | †Satellite voice communication
SB | Southbound
SBAS | (to be pronounced “ESS-BAS”) Satellite-based augmentation system
SC | Stratocumulus
SCR | +Schedule Clearance Request
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
SECN | Section
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 | +Standardised European Rules of the Air
SEV | Severe (used to qualify icing and turbulence reports)
SFC | Surface
SFT | +Surface Friction Tester
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 SH RA SN = 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
SIMUL | Simultaneous or simultaneously
SIWL | Single isolated wheel load
SKED | Schedule or scheduled
SLAP | +Slot allocation procedure
SLP | Speed limiting point
SLT | +Slot allocation message
SLW | Slow
SMA | +Schedule Movement Advice
SMC | Surface movement control
SMR | Surface movement radar
SN | Snow
SNOCLO | Aerodrome closed due to snow (used in METAR/SPECI)
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
SOC | Start of climb
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
SQL | Squall line
SR | Sunrise
SRA | Surveillance radar approach
SRE | Surveillance radar element of precision approach radar system
SRG | Short range
SRQ | +Slot request message
SRR | Search and rescue region
SRY | Secondary
SS | Sandstorm
SS | Sunset
SSB | Single sideband
SSE | South-south-east
SSIM | +Standard Schedules Information Manual
SSR | Secondary surveillance radar
SST | Supersonic transport
SSW | South-south-west
ST | Stratus
STA | Straight-in approach
STANAG | +Standardization Agreement
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 | +High Level Significant Weather Chart (FL 250 - FL 450)
SWL | +Low Level Significant Weather Chart (Surface - FL 100)
SWM | +Medium Level Significant Weather Chart (FL 100 - FL 250)
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 GLOSSARY OF TERMS
T | Temperature
T | ... True (preceded by a bearing to indicate reference to True North)
TA | Traffic advisory
TA | Transition altitude
TAA | Terminal arrival altitude
TACAN | †UHF tactical air navigation aid
TAF | †Aerodrome forecast (in meteorological code)
TA/H | Turn at an altitude/height
TAIL | †Tail wind
TAR | Terminal area surveillance radar
TAS | True airspeed
TAX | Taxiing or taxi
TC | Tropical cyclone
TCA | +Area of responsibility of TMA sector
TCAC | Tropical cyclone advisory centre
TCAS | +Traffic Collision Avoidance System
TCAS RA | †(to be pronounced “TEE-CAS-AR-AY”) Traffic alert and collision avoidance system resolution advisory
TCH | Threshold crossing height
TCO | +Third Country Operators
TCP | +Transfer of control point
TCU | Towering cumulus
TDA | +Area or responsibility of BUDAPEST DIRECTOR
TDO | Tornado
TDZ | Touchdown zone
TECR | Technical reason
TEL | Telephone
TEMPO | †Temporary or temporarily
TF | Track to fix
TFC | Traffic
TGL | Touch-and-go landing
TGL | +Temporary Guidance Leaflet
TGS | Taxiing guidance system
THR | Threshold
THRU | Through
THU | Thursday
TIBA | †Traffic information broadcast by aircraft
TIL | †Until
TIP | Until past ... (followed by place)
TIZ | +Traffic Information Zone
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
TMZ | +Transponder Mandatory Zone
TN | Minimum temperature ... (followed by figures in TAF)
TNA | Turn altitude
TNH | Turn height
TO | To ... (followed by place)
TOBT | +Target Off Block Time
TOC | Top of climb
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
TRCC | +Terminal Radar Control Centre
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. TS RA SN = thunderstorm with rain and snow)
TSA | +Temporary Segregated Area
TSB | +Transportation Safety Bureau
TSUNAMI | †Tsunami (used in aerodrome warnings)
TT | Teletypewriter
TUE | Tuesday
TURB | Turbulence
T-VASIS | †(to be pronounced “TEE –VASIS”) T visual approach slope indicator system
TVOR | Terminal VOR
TWR | Aerodrome control tower or aerodrome control
TWY | Taxiway
TWYL | +Taxiway-link
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, 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 GLOSSARY OF TERMS
U | Upward (tendency in RVR during previous 10 minutes)
U/S | Unserviceable
U2 | +200 HPA chart
U25 | +250 HPA chart
U3 | +300 HPA chart
U4 | +400 HPA chart
U5 | +500 HPA chart
U7 | +700 HPA chart
U85 | +850 HPA 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
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)
USD | +US dollars
UTA | Upper control area
UTC | Coordinated Universal Time
UTM | +Universal Transverse Mercator
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 | Heading to an altitude
VA | Volcanic ash
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 = funnel cloud, SH = shower, PO = dust/sand whirls, BL DU = blowing dust, BL SA = blowing sand, BL SN = blowing snow, DS = duststorm, SS = sandstorm, TS = thunderstorm or VA = volcanic ash e.g. VC FG = vicinity fog)
VCY | Vicinity
VDF | Very high frequency direction-finding station
VDL | +VHF Data Link
VER | Vertical
VFR | Visual flight rules
VHF | Very high frequency (30 to 300 MHZ)
VHO | +Veterinary Hygiene Office
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
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
VSS | +Visual segment surface
VTF | Vector to final
VTOL | Vertical take-off and landing
VV | Vertical visibility ... (followed by figures in METAR/SPECI and TAF)
VWS | +Vertical wind shear
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 | 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
WD | +Working day
WDI | Wind direction indicator
WDSPR | Widespread
WE | +Weekend
WED | Wednesday
WEF | With effect from or effective from
WGS-84 | World Geodetic System - 1984
WHI | +White
WI | Within
WID | Width or wide
WIE | With immediate effect or effective immediately
WILCO | †Will comply
WIND | Wind
WIP | Work in progress
WKN | Weaken or weakening
WMO | +World Meteorological Organization
WNW | West-north-west
WO | Without
WPT | Way-point
WRNG | Warning
WS | Wind shear
WSG | +Worldwide Slot Guidelines
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)
YEL | +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 GLOSSARY OF TERMS
Z | Coordinated Universal Time (in meteorological messages)