GEN 2.2  ABBREVIATIONS USED IN AIS PUBLICATIONS

*Abbreviations marked with an asterisk (*) are either different from or are 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
...CCentre (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
AAmber
A/AAir-to-air
A/GAir-to-ground
AALAbove aerodrome level
ABMAbeam
ABNAerodrome deacon
ABTAbout
ACAltocumulus
ACASAirborne collision avoidance system
ACCArea control centre or area control
ACCIDNotification of an aircraft accident
ACFTAircraft
ACKAcknowledge
ACLAltimeter check location
ACNAircraft classification number
ACPAcceptance (message type designator)
ACPTAccept or accepted
ACTActive or activated or activity
ADAerodrome
ADAAdvisory area
ADCAerodrome chart
ADDNAddition or additional
ADFAutomatic direction-finding equipment
ADIZ(to be pronounced “AY-DIZ”) Air defence identification zone
ADJAdjacent
ADOAerodrome office (specify service)
ADRAdvisory route
ADS-BAutomatic dependent surveillance-broadcast
ADS-CAutomatic dependent surveillance-contract
ADSUAutomatic dependent surveillance unit
ADVSAdvisory service
ADZAdvise
AESAircraft earth station
AFILFlight plan filed in the air
AFISAerodrome flight information service
AFMYes or affirm or affirmative or that is correct
AFSAeronautical fixed service
AFT...After…(time or place)
AFTNAeronautical fixed telecommunication network
AGAAerodromes, air routes and ground aids
AGLAbove ground level
AGNAgain
AICAeronautical information circular
AIPAeronautical information publication
AIRACAeronautical information regulation and control
AIREPAir-report
AIRMETInformation concerning en-route weather phenomena which may affect the safety of low-level aircraft operations
AISAeronautical information services
ALAAlighting area
ALERFAAlert phase
ALRAlerting (message type designator)
ALSApproach lighting system
ALTAltitude
ALTNAlternate or alternating (light alternates in colour)
ALTNAlternate (aerodrome)
AMAArea minimum altitude
AMDAmend or amended (used to indicate amended meteorological message; message type designator)
AMDTAmendment (AIP amendment)
AMSAeronautical mobile service
AMSLAbove mean sea level
AMSSAeronautical mobile satellite service
ANC...Aeronautical chart-1:500 000 (followed by name/title)
ANCS...Aeronautical navigation chart-small scale (followed by name/title)
ANSAnswer
AOCAerodrome obstacle chart
APAirport
APCHApproach
APDC…Aircraft parking/docking chart (followed by name/title)
APNApron
APPApproach control office or approach control or approach control service
APRApril
APRXApproximate or approximately
APSGAfter passing
APVApprove or approved or approval
ARCArea chart
ARNGArrange
AROAir traffic services reporting office
ARPAerodrome reference point
ARPAir-report (message type designator)
ARQAutomatic error correction
ARRArrive or arrival
ARRArrival (message type designator)
ARSSpecial air-report (message type designator)
ARSTArresting [specify (part of) aircraft arresting equipment]
ASAltostratus
ASCAscend to or ascending to
ASDAAccelerate-stop distance available
ASEAltimetry system error
ASPHAsphalt
ATAActual time of arrival
ATCAir traffic control (in general)
ATCSMAC...Air traffic control surveillance minimum altitude chart (followed by name/title)
ATDActual time of departure
ATFMAir traffic flow management
ATISAutomatic terminal information service
ATMAir traffic management
ATNAeronautical telecommunication network
ATP...At…(followed by time or place)
ATSAir traffic services
ATTNAttention
ATZAerodrome traffic zone
AUGAugust
AUTHAuthorized or authorization
AUWAll up weight
AUXAuxiliary
AVBL Available or availability
AVGAverage
AVGASAviation gasoline
AWYAirway
AZMAzimuth
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
BBlue
BABraking action
BASECloud base
BCFGFog patches
BCNBeacon (aeronautical ground light)
BCSTBroadcast
BDRYBoundary
BFRBefore
BKNBroken
BLDGBuilding
BLOBelow clouds
BLW...Below…
BOMBBombing
BRMist
BRFShort (used to indicate the type of approach desired or required)
BRGBearing
BRKGBraking
BSCommercial broadcasting station
BTLBetween layers
BTNBetween
BUFRBinary universal form for the representation of meteorological data
. - 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
CDegrees Celsius (Centigrade)
CACourse to an altitude
CAATThe Civil Aviation Authority of Thailand
CATCategory
CATClear 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
CCCirrocumulus
CDCandela
CDNCoordination (message type designator)
CFChange frequency to…
CFCourse to a fix
CGLCircling guidance light(s)
CHChannel
CHEMChemical
CHGModification (message type designator)
CICirrus
CIDINCommon ICAO data interchange network
CITNear or over large towns
CIVCivil
CKCheck
CLCentre line
CLAClear type of ice formation
CLBRCalibration
CLDCloud
CLGCalling
CLIMB-OUTClimb-out area
CLRClear(s) or cleared to …or clearance
CLSDClose or closed or closing
CMCentimetre
CMBClimb to or climbing to
CMPLCompletion or completed or complete
CNLCancel or cancelled
CNLFlight plan cancellation (message type designator)
CNSContinuous
COMCommunications
CONCConcrete
CONDCondition
CONSContinuous
CONSTConstruction or constructed
CONTContinue or continued
COORCoordinate or coordination
COPChange-over point
CORCorrect or correction or corrected (used to indicate corrected meteorological message; message type designator)
COTAt the coast
COVCover or covered or covering
CPDLCController-pilot data link communications
CPLCurrent flight plan (message type designator)
CRCCyclic redundancy check
CRMCollision risk model
CRZCruise
CSCall sign
CSCirrostratus
CTAControl area
CTAMClimb to and maintain
CTCContact
CTLControl
CTNCaution
CTRControl zone
CUCumulus
CUFCumuliform
CUSTCustoms
CWContinuous 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
D-ATIS(to be pronounced “DEE-ATIS”) Data link automatic terminal information service
D-VOLMETData link VOLMET
D...Danger area (followed by identification)
DADecision Altitude
DCDDouble channel duplex
DCKGDocking
DCPDatum crossing point
DCPCDirect controller-pilot communications
DCSDouble channel simplex
DCTDirect (in relation to flight plan clearances and type of approach)
DECDecember
DEGDegrees
DEPDepart or departure
DEPODeposition
DERDeparture end of the runway
DESDescend to or descending to
DESTDestination
DETRESFADistress phase
DEVDeviation or deviating
DFDirection finding
DFDRDigital flight data recorder
DFTIDistance from touchdown indicator
DHDecision height
DIFDiffuse
DISTDistance
DIV Divert or diverting
DLADelay (message type designator)
DLADelay or delayed
DLICData link initiation capability
DLYDaily
DMEDistance measuring equipment
DNGDanger or dangerous
DOMDomestic
DPDew point temperature
DPTDepth
DRDead reckoning
DRGDuring
DSDuststorm
DSBDouble sideband
DTAMDescend to and maintain
DTGDate-time group
DTHRDisplaced runway threshold
DTRTDeteriorate or deteriorating
DTWDual tandem wheels
DUDust
DUCDense upper cloud
DURDuration
DVORDoppler VOR
DWDual wheels
DX*Duplex
DZDrizzle
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
EEast or eastern longitude
EATExpected approach time
EBEastbound
EDAElevation differential area
EETEstimated elapsed time
EFCExpect further clearance
EHFExtremely high frequency [30 000 to 300 000 MHz]
ELBAEmergency location beacon-aircraft
ELEVElevation
ELRExtra long range
ELTEmergency locator transmitter
EMEmission
EMBDEmbedded in layer (to indicate Cumulonimbus embedded in layer of other clouds)
EMERGEmergency
EN*English
ENDStop-end (related to RVR)
ENEEast north east
ENGEngine
ENREn-route
EOBTEstimated off-block time
EQPTEquipment
ERHere or herewith
ESEEast-south-east
ESTEstimate or estimated or estimation (message type designator)
ETAEstimated time of arrival or estimating arrival
ETDEstimated time of departure or estimating departure
ETOEstimated time over significant point
EUR RODEXEuropean regional OPMET data exchange
EVEvery
EVSEnhanced vision system
EXCExcept
EXERExercises or exercising or to exercise
EXPExpect or expected or expecting
EXTDExtend 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
FDegrees Fahrenheit
FFixed
FACourse from a fix to an altitude
FACFacilities
FAFFinal approach fix
FALFacilitation of international air transport
FAPFinal approach point
FASFinal approach segment
FATOFinal approach and take-off
FAXFacsimile transmission
FBLLight (used to qualify icing, turbulence, interference or static reports)
FCFunnel cloud
FCSTForecast
FCTFriction coefficient
FDPSFlight data processing system
FEBFebruary
FGFog
FICFlight information centre
FIRFlight information region
FISFlight information service
FISAAutomated flight information service
FLFlight level
FLDField
FLGFlashing
FLRFlares
FLTFlight
FLTCKFlight check
FLUCFluctuating or fluctuation or fluctuated
FLWFollow(s) or following
FLYFly or flying
FMCourse from a fix to manual termination (used in navigation database coding)
FMFrom
FNAFinal approach
FPLFiled flight plan (message type designator)
FPMFeet per minute
FPR Flight plan route
FRFuel remaining
FREQFrequency
FRIFriday
FRNGFiring
FRONTFront (relating to weather)
FROSTFrost (used in aerodrome warnings)
FRQFrequent
FSLFull stop landing
FSSFlight service station
FSTFirst
FTFeet
FTEFlight technical error
FTPFictitious threshold point
FTTFlight technical tolerance
FUSmoke
FZFreezing
FZDZFreezing drizzle
FZFGFreezing fog
FZRAFreezing 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
GGreen
G/AGround-to-air
G/A/GGround-to-air and air-to-ground
GAGAN GPS and geostationary earth orbit augmented navigation
GAINAirspeed or headwind gain
GAMETArea forecast for low-level flights
GARP GBAS azimuth reference point
GBAS(to be pronounced “GEE-BAS”) Ground-based augmentation system
GCAGround controlled approach system or ground controlled approach
GENGeneral
GEOGeographic or true
GESGround earth station
GLDGlider
GLONASS(to be pronounced “GLO-NAS”) Global orbiting navigation satellite system
GLS GBAS landing system
GMC...Ground movement chart (followed by name/title)
GNDGround
GNDCKGround check
GNSSGlobal navigation satellite system
GPGlide path
GPAGlide path angle
GPIPGlide path intercept point
GPSGlobal positioning system
GPWSGround proximity warning system
GRHail
GRAS(to be pronounced “GRASS”) Ground-based regional augmentation system
GRASSGrass landing area
GRIBProcessed meteorological data in the form of grid point values expressed in binary form (meteorological code)
GRVLGravel
GSGround speed
GSSmall hail and/or snow pellets
GUNDGeoid 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
HHigh pressure area or the centre of high pressure
H24Continuous day and night service
HAHolding/racetrack to an altitude
HAPIHelicopter approach path indicator
HBNHazard beacon
HDFHigh frequency direction-finding station
HDGHeading
HELHelicopter
HFHigh frequency [3 000 to 30 0000 kHz]
HFHolding/racetrack to a fix
HGTHeight or height above
HJSunrise to sunset
HLDGHolding
HMHolding/racetrack to a manual termination
HNSunset to sunrise
HOService available to meet operational requirement
HOLHoliday
HOSPHospital aircraft
HPAHectopascal
HRHours
HSService available during hours of scheduled operations
HUDHead-up display
HURCNHurricane
HVDFHigh and very high frequency direction-finding stations (at the same location)
HVYHeavy
HXNo specific working hours
HYRHigher
HZHaze
HZHertz (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
IACInstrument approach chart (followed by name/title)
IAFInitial approach fix
IAOIn and out of clouds
IAPInstrument approach procedure
IARIntersection of air routes
IASIndicated airspeed
IBNIdentification beacon
ICAOInternational Civil Aviation Organisation
ICEIcing
IDIdentifier or identify
IDENTIdentification
IFIntermediate approach fix
IFFIdentification friend/foe
IFRInstrument flight rules
IGAInternational general aviation
ILSInstrument landing system
IMInner marker
IMCInstrument meteorological conditions
IMGImmigration
IMPRImprove or improving
IMTImmediate or immediately
INAInitial approach
INBDInbound
INCIn cloud
INCERFAUncertainty phase
INFOInformation
INOPInoperative
INPIf not possible
INPRIn progress
INSInches (dimensional unit)
INSInertial navigation system
INSTLInstall or installed or installation
INSTRInstrument
INTIntersection
INTER*Intermittent
INTLInternational
INTRGInterrogator
INTRPInterrupt or interruption or interrupted
INTSFIntensify or intensifying
INTSTIntensity
IRIce on runway
IRSInertial reference system
ISAInternational standard atmosphere
ISBIndependent sideband
ISOLIsolated
ITC*International aeronautical fixed Telecommunication centre
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
JANJanuary
JTSTJet stream
JULJuly
JUNJune
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
KGKilograms
KHZKilohertz
KIASKnots indicated airspeed
KMKilometres
KMHKilometres per hour
KPAKilopascal
KTKnots
KWKilowatts
… - 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
LLocator (see LM, LO)
LLow pressure area or the centre of low pressure
LAMLogical acknowledgment (message type designator)
LANInland
LATLatitude
LCALocal or locally or location or located
LDALanding distance available
LDAHLanding distance available, helicopter
LDGLanding
LDILanding direction indicator
LENLength
LFLow frequency [30 to 300 kHz]
LGTLight or lighting
LGTDLighted
LIHLight intensity high
LILLight intensity low
LIMLight intensity medium
LMLocator, middle
LMTLocal mean time
LNAV(to be pronounced “EL-NAV”) Lateral navigation
LNGLong (used to indicate the type of approach desired or required)
LOLocator, outer
LOCLocalizer
LONGLongitude
LORANLoran (long range air navigation system)
LOSSAirspeed or headwind loss
LPVLocalizer performance with vertical guidance
LRGLong range
LTDLimited
LTPLanding threshold point
LTTLandline teletypewriter
LVLight and variable (relating to wind)
LVELeave or leaving
LVLLevel
LYRLayer or layered
… - 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/W*Microwave
MAAMaximum authorized altitude
MAGMagnetic
MAHFMissed approach holding fix
MAINTMaintenance
MAPAeronautical maps and charts
MAPTMissed approach point
MARAt sea
MARMarch
MASManual A1 Simplex
MATFMissed approach turning fix
MAXMaximum
MAYMay
MBSTMicroburst
MCAMinimum crossing altitude
MCWModulated continuous wave
MDAMinimum descent altitude
MDFMedium frequency direction-finding station
MDHMinimum descent height
MEAMinimum en-route altitude
MEHTMinimum eye height over threshold (for visual approach slope indicator system)
METMeteorological or meteorology
METARAerodrome routine meteorological report (in meteorological code)
MFMedium frequency [300 to 3000 kHz]
MHDFMedium and high frequency direction-finding stations (at the same location)
MHVDFMedium, high and very high frequency direction-finding stations (at the same location)
MHZMegahertz
MIDMid-point (related to RVR)
MIFGShallow fog
MILMilitary
MINMinutes
MKRMarker radio beacon
MLSMicrowave landing system
MMMiddle marker
MNMMinimum
MNPSMinimum navigation performance specifications
MNTMonitor or monitoring or monitored
MNTNMaintain
MOAMilitary operating area
MOCMinimum obstacle clearance (required)
MOCAMinimum obstacle clearance altitude
MODModerate (used to indicate the intensity of weather phenomena, interference or static reports, e.g MODRA=moderate rain)
MONAbove mountains
MONMonday
MOPSMinimum operational performance standards
MOVMove or moving or movement
MPSMetres per second
MRAMinimum reception altitude
MRGMedium range
MRP ATS/MET reporting point
MSMinus
MSAMinimum sector altitude
MSAS(to be pronounced “EM-SAS”) Multi-functional transport satellite (MTSAT)
MSAWMinimum safe altitude warning
MSGMessage
MSLMean sea level
MTMountain
MTUMetric units
MTWMountain waves
MVDFMedium and very high frequency direction-finding stations (at the same location)
MWOMeteorological watch office
MXMixed 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
M…Mach number (followed by figures)
M…Minimum value of runway visual range (followed by figures in METAR/SPECI)
NNo distinct tendency (in RVR during previous 10 minutes)
NNorth or northern latitude
NATNorth Atlantic
NAVNavigation
NBNorthbound
NBFRNot before
NCNo change
NDBNon-directional radio beacon
NENorth-east
NEBNorth-eastbound
NEGNo or negative or permission not granted or that is not correct
NGTNight
NILNone or l have nothing to send to you
NMNautical miles
NMLNormal
NNNo name, unnamed
NNENorth-north-east
NNWNorth-north-west
NOFInternational NOTAM office
NOSIGNo significant change (used in trend-type landing forecasts)
NOTAMA 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
NOVNovember
NRNumber
NRHNo reply heard
NSNimbostratus
NSCNil significant cloud
NSENavigation system error
NWNorth-west
NWBNorth-westbound
NXTNext
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/ROn request
OACOceanic area control center
OASObstacle assessment surface
OBSObserve or observed or observation
OBSCObscure or obscured or obscuring
OBSTObstacle
OCAObstacle Clearance Altitude or Height
OCAOceanic control area
OCCOcculting (light)
OCHObstacle Clearance Height
OCLObstacle clearance limit
OCNLOccasional or occasionally
OCSObstacle clearance surface
OCTOctober
OFZObstacle free zone
OHDOverhead
OISObstacle identification surface
OLDIOn-line data interchange
OMOuter marker
OPAOpaque, white type of ice formation
OPCThe control indicated is operational control
OPMETOperational meteorological (information)
OPNOpen or opening or opened
OPROperator or operate or operative or operating or operational
OPSOperations
ORDIndication of an order
OSVOcean station vessel
OTPOn top
OTSOrganized track system
OUBDOutbound
OVCOvercast
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
PAPrecision approach
PACT…Precision approach terrain chart (followed by name/title)
PALSPrecision approach lighting system (specify category)
PANSProcedures for air navigation services
PAPIPrecision approach path indicator
PARPrecision approach radar
PARLParallel
PAXPassenger(s)
PBNPerformance-based navigation
PCDProceed or proceeding
PCLPilot-controlled lighting
PCNPavement classification number
PDCPre-departure clearance
PDGProcedure design gradient
PERPerformance
PERMPermanent
PIBPre-flight information bulletin
PJEParachute jumping exercise
PLIce pellets
PLAPractice low approach
PLNFlight plan
PLVLPresent level
PNPrior notice required
PNRPoint of no return
PODust devils
POBPersons on board
POSSPossible
PPIPlan position indicator
PPRPrior permission required
PPSNPresent position
PRFGAerodrome partially covered by fog
PRIPrimary
PRKGParking
PROBProbability
PROCProcedure
PROVProvisional
PSPlus
PSGPassing
PSNPosition
PSPPierced steel plank
PSRPrimary surveillance radar
PSYSPressure system(s)
PTNProcedure turn
PTSPolar track structure
PWRPower
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
P…Prohibited area (followed by identification)
QDMMagnetic heading (zero wind)
QDRMagnetic bearing
QFEAtmospheric pressure at aerodrome elevation (or at runway threshold)
QFUMagnetic orientation of runway
QNHAltimeter sub-scale setting to obtain elevation when on the ground
QTETrue bearing
QUADQuadrant
… - 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
RRate of turn
RRed
RARain
RAResolution advisory
RACRules of the air and air traffic services
RAGRagged
RAGRunway arresting gear
RAIRunway alignment indicator
RAIMReceiver autonomous integrity monitoring
RAPCON*Radar approach control
RASCRegional AIS system centre
RASSRemote altimeter setting source
RBRescue boat
RCAReach cruising altitude
RCAG*Remote control air ground
RCCRescue co-ordination centre
RCFRadio communication failure (message type designator)
RCHReach or reaching
RCLRunway centre line
RCLLRunway centre line light(s)
RCLRRecleared
RCPRequired communication performance
RDHReference datum height (for ILS)
RDLRadial
RDORadio
RERecent (used to qualify weather phenomena such as rain, e.g. recent rain = RERA)
RECReceive or receiver
REDLRunway edge light(s)
REFReference to…or refer to…
REGRegistration
REIL*Runway end identifier light(s)
RENLRunway end light(s)
REPReport or reporting or reporting point
REQRequest or requested
RERTERe-route
RESARunway end safety area
RFConstant radius arc to a fix
RGRange (lights)
RHCRight-hand circuit
RIFReclearance in flight
RITERight (direction of turn)
RLReport leaving
RLARelay to
RLCERequest level change en route
RLLSRunway lead-in lighting system
RMKRemark
RNAV(to be pronounced “AR-NAV”) Area navigation
RNGRadio range
RNPRequired navigation performance
ROBEXRegional OPMET bulletin exchange (scheme)
ROCRate of climb
RODRate of descent
RONReceiving only
RPDSReference path data selector
RPIRadar position indicator
RPLRepetitive flight plan
RPLCReplace or replaced
RPSRadar position symbol
RQNMTSRequirements
RRReport reaching
RRA(or RRB, RRC…etc., in sequence) Delayed meteorological message (message type designator)
RSCRescue sub-centre
RSCDRunway surface condition
RSPResponder beacon
RSREn-route surveillance radar
RTAF*Royal Thai Air Force
RTDDelayed (used to indicate delayed meteorological message; message type designator)
RTERoute
RTFRadiotelephone
RTGRadiotelegraph
RTHLRunway threshold light(s)
RTNReturn or returned or returning
RTN*Royal Thai Navy
RTODAHRejected take-off distance available, helicopter
RTSReturn to service
RTTRadio teletype writer
RTZLRunway touchdown zone light(s)
RUTStandard regional route transmitting frequencies
RVRescue vessel
RVRRunway visual range
RVSMReduced vertical separation minimum (300 m (1 000 ft)) between FL 290 and FL 410
RWYRunway
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
R…Restricted area (followed by identification)
R…Runway (followed by figures in METAR/SPECI)
SSouth or southern latitude
SASand
SALSSimple approach lighting system
SANSanitary
SAPAs soon as possible
SARSearch and rescue
SARPSStandard and Recommended Practices (ICAO)
SATSaturday
SATCOMSatellite communication
SBSouthbound
SBAS(to be pronounced “ESS-BAS”) Satellite-based augmentation system
SCStratocumulus
SCTScattered
SDStandard deviation
SDBYStand by
SDFStandard deviation Stepdown fix
SESouth-east
SEBSouth-eastbound
SECSeconds
SECNSection
SECTSector
SELCALSelective calling system
SEPSeptember
SERService or servicing or served
SEVSevere (used e.g. to qualify icing and turbulence reports)
SFCSurface
SGSnow grains
SGLSignal
SHFSuper high frequency [3 000 to 30 000 MHz]
SH…Shower (followed by RA=rain, SN=snow, PL=ice pellets, GR=hail, GS=small hail and/or snow pellets or combinations thereof, e.g. SHRASN=showers of rain and snow)
SIInternational system of units
SIDStandard instrument departure
SIFSelective identification feature
SIGMETInformation concerning en-route weather phenomena which may affect the safety of aircraft operations
SIMULSimultaneous or simultaneously
SIWLSingle isolated wheel load
SKEDSchedule or scheduled
SLPSpeed limiting point
SLWSlow
SMCSurface movement control
SMRSurface movement radar
SNSnow
SNOCLOAerodrome closed due to snow (used in METAR/SPECI)
SNOWTAMA 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
SPECIAviation selected special weather report (in aeronautical meteorological (code)
SPECIALSpecial meteorological report (in abbreviated plain language)
SPISpecial position indicator
SPLSupplementary flight plan (message type designator)
SPOC SAR point of contact
SPOTSpot wind
SQSquall
SRSunrise
SRASurveillance radar approach
SRESurveillance radar element of precision approach radar system
SRGShort range
SRRSearch and rescue region
SRYSecondary
SSSandstorm
SSSunset
SSBSingle sideband
SSESouth-south-east
SSRSecondary surveillance radar
SSTSupersonic transport
SSWSouth-south-west
STStratus
STAStraight in approach
STARStandard instrument arrival
STDStandard
STFStratiform
STNStation
STNRStationary
STOLShort take-off and landing
STSStatus
STWLStopway light(s)
SUBJSubject to
SUNSunday
SUPPSRegional supplementary procedures
SVCService message
SVCBLServiceable
SWSouth-west
SWBSouth-westbound
SWYStopway
SX*Simplex
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
S…State of the sea (followed by figures in METAR/SPECI)
TTemperature
T-VASIS(to be pronounced”TEE-VASIS”) T visual approach slope indicator system
TATraffic advisory
TATransition altitude
TA/HTurn at an altitude/height
TAATerminal arrival altitude
TACAN UHF tactical air navigation aid
TAFAerodrome forecast
TAILTail wind
TARTerminal area surveillance radar
TASTrue airspeed
TAXTaxiing or taxi
TCTropical cyclone
TCACTropical cyclone advisory centre
TCAS RA(to be pronounced “TEE-CAS-AR-AY” Traffic alert and collision avoidance system resolution advisory
TCHThreshold crossing height
TCUTowering cumulus
TDOTornado
TDZTouchdown zone
TECRTechnical reason
TELTelephone
TEMPOTemporary or temporarily
TFTrack to fix
TFCTraffic
TGLTouch-and-go landing
TGSTaxiing guidance system
THRThreshold
THRUThrough
THUThursday
TILUntil
TIPUntil past…(followed by place)
TKOFTake-off
TLOFTouchdown and lift-off area
TL…Till (followed by time be which weather change is forecast to end)
TMATerminal control area
TNATurn altitude
TNHTurn height
TN…Minimum temperature (followed be figures in TAF)
TOCTop of climb
TODATake-off distance available
TODAHTake-off distance available, helicopter
TOPCloud top
TORATake-off run available
TOXToxic
TO…To…(followed by place)
TPTurning point
TRTrack
TRATemporary reserved airspace
TRANSTransmits or transmitter
TRLTransition level
TROPTropopause
TSThunderstorm (in aerodrome reports and forecasts, TS used alone means thunder heard but no precipitation at the aerodrome)
TSUNAMITsunami (used in aerodrome warnings)
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. TSRANSN=thunderstorm with rain and snow)
TTTeletypewriter
TUETuesday
TURBTurbulence
TVORTerminal VOR
TWRAerodrome control tower or aerodrome control
TWYTaxiway
TWYLTaxiway-link
TX…Maximum temperature (followed by figures in TAF)
TYPType of aircraft
TYPHTyphoon
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
UUpward (tendency in RVR during previous 10 minutes)
U/SUnserviceable
UAUnmanned aircraft
UAB…Until advised by…
UACUpper area control centre
UARUpper air route
UASUnmanned aircraft system
UDFUltra high frequency direction-finding station
UFNUntil further notice
UHDTUnable higher due traffic
UHFUltra high frequency [300 to 3 000 MHz]
UICUpper information centre
UIRUpper flight information region
ULRUltra long range
UNAUnable
UNAPUnable to approve
UNLUnlimited
UNRELUnreliable
UPUnidentified precipitation (used in automated METAR/SPECI)
UTAUpper control area
UTCCoordinated Universal Time
… - 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
VAHeading to an altitude
VAVolcanic ash
VAACVolcanic ash advisory centre
VAC…Visual approach chart (followed by name/title)
VALIn valleys
VANRunway control van
VARMagnetic variation
VARVisual-aural radio range
VASISVisual approach slope indicator systems
VCYVicinity
VC…Vicinity of the aerodrome (followed by FG=fog, FC=funnel cloud, SH=shower, PO=dust/sand whirls, BLDU=blowing dust, BLSA=blowing sand, BLSN=blowing snow, DS=dust storm, SS=sandstorm, TS=thunderstorm or VA=volcanic ash, e.g. VCFG=vicinity fog)
VDFVery high frequency direction-finding station
VERVertical
VFRVisual flight rules
VHFVery high frequency [30 to 300 MHz]
VIHeading to an intercept
VIPVery important person
VISVisibility
VLFVery low frequency [3 to 30 kHz]
VLRVery long range
VMHeading to a manual termination
VMCVisual meteorological conditions
VNAV(to be pronounce VEE-NAV) Vertical navigation
VOLMETMeteorological information for aircraft in flight
VOR VHF omnidirectional radio range
VORTAC VOR and TACAN combination
VOT VOR airborne equipment test facility
VPAVertical path angle
VRBVariable
VSABy visual reference to the ground
VSP Vertical speed
VTFVector to final
VTOLVertical take-off and landing
VV…Vertical visibility (followed by figures in METAR/SPECI and TAF)
W - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
WWest or western longitude
WWhite
W ...Sea-surface temperature (followed by figures in METAR/SPECI)
WAASWide area augmentation system
WACWorld aeronautical Chart – ICAO 1: 1 000 000
WAFCWorld area forecast centre
WBWestbound
WBARWing bar lights
WBIWind direction indicator
WDSPRWidespread
WEDWednesday
WEFWith effect from or effective from
WGS-84World Geodetic System-1984
WIWithin
WIDWidth
WIEWith immediate effect or effective immediately
WILCOWill comply
WIPWork in progress
WKNWeaken or weakening
WNWWest-north-west
WOWithout
WPTWay-point
WRNGWarning
WSWind shear
WSPDWind speed
WSWWest-south-west
WTWeight
WTSPTWaterspout
WWWWorldwide web
WXWeather
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
XCross
XBARCrossbar (of approach lighting system)
XNGCrossing
XSAtmospherics
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
YYellow
YCZYellow caution zone (runway lighting)
YRYour
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
ZCoordinated Universal Time (in meteorological messages)
…LLeft (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
…MMetres (preceded by figures)
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
…RRight (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
…V…Variations from the mean wind direction (preceded and followed by figures in METAR/SPECI, e.g. 350V070)
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