GEN 2.2   ABBREVIATIONS USED IN AIS PUBLICATIONS

The abbreviations used in AIS publications are as specified in Doc 8400, ICAO Abbreviations and Codes and Doc 8126, Aeronautical Information Services. Additional abbreviations are used to provide for local requirements. 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
...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
..M Meters(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
A Amber
A/A Air-to-air
A/G Air-to-ground
AAD Assigned altitude deviation
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 center
ACCID Notification of an aircraft accident
ACFT Aircraft
ACK Acknowledge
ACL Altimeter check location
ACN Aircraft classification number
ACP Acceptance(message type designator)
ACPT Accept, 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 Air defence identification zone
ADJ Adjacent
ADR Advisory route
ADS Automatic dependent surveillance
ADSU Automatic dependent surveillance unit
ADVS Advisory service
ADZ Advise
AES Aircraft earth station
AFFF** Aqueous Film Forming Foam
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
AGA Aerodrome, air routes and ground aids
AGL Above ground level
AGN Again
AIC Aeronautical information circular
AIDC Air traffic services inter-facility data communication
AIP Aeronautical information publication
AIRAC Aeronautical information regulation and control
AIREP Air-report
AIRMET Information concerning enroute 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
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 byname/title and scale)
ANS Answer
AOC Aerodrome obstacle chart
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
APSG After passing
APV Approve or approved or approval
ARC Area chart
ARFOR Area forecast (in aeronautical meteorological code)
ARNG Arrange
ARO Air traffic services reporting office
ARP Aerodrome reference point
ARP Air-report (message type designator)
ARQ Automatic error correction
ARR 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
ASC Ascend to or ascending to
ASDA Accelerate-stop distance available
ASE Altimetry system error
ASPH Asphalt
AT At (followed by time at which weather change is forecast to occur)
AT-VASIS Abbreviated T visual approach slope indicator system
ATA Actual time of arrival
ATC Air traffic control (in general)
ATD Actual time of departure
ATFM Air traffic flow management
ATIS Automatic terminal information service
ATM Air traffic management
ATN Aeronautical telecommunication network
ATP At... (time or place)
ATS Air traffic services
ATTN Attention
ATZ Aerodrome traffic zone
AUG August
AUTH Authorized or authorization
AUW All up weight
AUX Auxiliary
AVBL Available or availability
AVG Average
AVGAS Aviation gasoline
AVGAS Aviation gasoline
AWTA Advise at what time able
AWY Airway
AZM Azimuth
B - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
B Blue
BA Braking action
BARO-VNAV Barometric Vertical Navigation
BASE Cloud base
BCFG Fog patches
BCN Beacon (aeronautical ground light)
BCST Broadcast
BDRY Boundary
BECMG Becoming
BFR Before
BKN Broken
BL... Blowing (followed by DU=dust, SA=sand or SN=snow)
BLDG Building
BLO Below clouds
BLW Below...
BOMB Bombing
BR Mist
BRF Short (used to indicate the type of approach desired or required)
BRG Bearing
BRKG Braking
BS Commercial broadcasting station
BTL Between layers
BTN Between
. - 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)
CAT Category
CAT Clear air turbulance
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
CCA (or CCB, CCC...etc. in sequence) Corrected meteorological message (message type designator)
CCW* Counterclockwise
CD Candela
CDN Coordination
CF Change frequency to ...
CF(Path Descriptor) Course to a Fix
CG** Climb gradient
CGL Circling guidance light
CH Channel
CHG Modification (message type designator)
CI Cirrus
CIDIN Common ICAO data interchange network
CIT Near or over large town
CIV Civil
CK Check
CL Centre line
CLA Clear type of ice formation
CLBR Calibration
CLD Cloud
CLR Clear(s) or cleared to ... or clearance
CLSD Close or closed or closing
CM Centimeter
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 Coordinate or coordination
COORD Coordinates
COP Change-over-point
COR Correct or corrected or correction(used to indicate corrected meterological message : message type designator)
COT At the coast
COV Cover or covered or covering
CPL Current flight plan (message type designator)
CRC Cyclic redundancy check
CRM Collision risk model
CRZ Cruise
CS Cirrostratus
CS Call sign
CTA Control area
CTAM Climb to and maintain
CTC Contact
CTL Control
CTN Caution
CTR Control zone
CU Cumulus
CUF Cumuliform
CUST Customs
CVR Cockpit voice recorder
CW Continuous wave
CW* Clockwise
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 Downward (tendency in RVR during previous 10 minutes)
D-ATIS (to be pronounced "DEE-ATIS") Data link automatic terminal information service
D-VOLMET Data link VOLMET
D... Danger area (followed by identification)
DA Decision altitude
DCD Double channel duplex
DCKG Docking
DCKG Docking
DCPC Direct controller-pilot communications
DCS Double channel simplex
DCT Direct (in relation to flight plan clearances and type of approach)
DE From (used to precede the call sign of the calling station) (to be used in AFS as a procedure signal)
DEC December
DEG Degrees
DENEB Fog dispersal operations
DEP Depart or departure
DEP Departure (message type designator)
DER* Departure end of the runway
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 or delayed or Delay (message type designator)
DLA Delay or delayed
DLVRY** Delivery
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 Dust storm
DSB Double Sideband
DTAM Descend to and maintain
DTG Date-time group
DTHR Displaced runway threshold
DTRT Deteriorate or deteriorating
DTW Dual tandem wheels
DU Dust
DUC Dense upper cloud
DUR Duration
DVOR Doppler VOR
DW Dual wheels
DZ Drizzle
E - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
E East or eastern longitude
EAT Expected approach time
EB East bound
EET Estimated elapsed time
EFC Expect further clearance
EHF Extremely high frequency (30 000 to 300 000 Mhz)
ELBA Emergency location beacon-aircraft
ELEV Elevation
ELR Extra long range
ELT Emergency locator transmitter
EM Emission
EMBD Embedded in a layer (to indicate cumulonimbus embedded in layers of other clouds)
EMERG Emergency
END Stop-end (related to RVR)
ENE East north east
ENG Engine
ENR En route
ENRC Enroute chart (followed by name/title)
EOBT Estimated off-block time
EQPT Equipment
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
EV Every
EXC Except
EXER Exercise 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)
FC Funnel cloud(tornado or water spout)
FCST Forecast
FCT Friction coefficient
FDPS Flight data processing system
FDR Flight data recorder
FEB February
FEW Few
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)
FMC Flight management computer
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
FREQ Frequency
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
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 Go ahead, resume sending to be used in AFS as a procedure signal
GAMET Area forecast for low-level flights
GCA Ground controlled approach system or ground controlled approach
GEN General
GEO Geographic or true
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
GR Hail
GRASS Grass landing area
GRID Processed meteorological data in the form of grid point values expressed in binary form(meteological code)
GRVL Gravel
GS Ground speed
GS Small hail and/or snow pellets
GUND Geoid undulation
H - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
H24 Continuous day and night service
HAPI Helicopter approach path indicator
HBN Hazard beacon
HCH Heliport crossing height
HDF High frequency direction-finding station
HDG Heading
HEL Helicopter
HF High frequency(3,000 to 30,000Khz)
HGT Height or height above
HJ Sunrise to sunset
HLDG Holding
HM(Path Descriptor) Holding/Racetrack to a manual termination
HN Sunset to sunrise
HO Service available to meet operational requirement
HOL Holiday
HOSP Hospital aircraft
HPA Hectopascal
HR Hours
HRP Heliport reference point
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
HYR Higher
HZ Haze
Hz Hertz(cycle per second)
I - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
IAC Instrument approach chart(followed by name/title)
IAF Initial approach fix
IAO In and out of clouds
IAR Intersection of air routes
IAS Indicated air speed
IBN Identification beacon
IC Ice Crystals(very small ice crystals in suspension, also known as diamond dust))
ICE Icing
ID Identifier or identify
IDENT Identification
IF Intermediate approach fix
IF*(Path Descriptor) Initial Fix
IFF Identification friend/foe
IFR Instrument fight rule
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
ISB Independent sideband
ISOL Isolated
J - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
JAN January
JTST Jet stream
JUL July
JUN June
K - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
KG Kilograms
KHZ Kilohertz
KIAS Knots indicated airspeed
KM kilometers
KMH Kilometers per hour
KPA Kilopascal
KST Korean standard time
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
L Left(preceded by runway designation number to identify a parallel runway)
L Locator(see LM, LO)
LAM Logical acknowledgement(message type designator)
LAN Inland
LAT Latitude
LDA Landing distance available
LDAH Landing distance available, helicopter
LDG Landing
LDI Landing direction indicator
LEN Length
LF Low frequency(30 to 300Khz)
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
LNAV Lateral Navigation
LNG Long(Used to indicate the type of approach desired or required)
LO Locator, outer
LOC Localizer
LONG Longitude
LORAN LORAN(long range air navigation system)
LR** Lead radial
LRG Long range
LSQ Line squall
LTD Limited
LTT Landing teletypewriter
LV Light and variable(relating to wind)
LVE Leave or leaving
LVL Level
LYR Layer 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... Mach number(followed by figures)
M... Minimum value of runway visual range(followed by figures in METAR/SPECI)
MAA Maximum authorized altitude
MAG Magnetic
MAINT Maintenance
MAP Aeronautical maps and charts
MAPT Missed approach point
MAR At sea
MAR March
MAS Manual Al simplex
MAX Maximum
MAY May
MCA Minimum crossing altitude
MCW Modulated continuous wave
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)
MF Medium frequency(300 to 3,000Khz)
MHDF Medium and high frequency direction-finding stations(at the same location)
MHVDF Medium, high and very high frequency direction-finding station(at the same location)
MHZ Megahertz
MID Mid-point(related to RVR)
MIFG Shallow fog
MIL Military
MIN Minute
MKR Marker radio beacon
MLS Microwave landing system
MM Middle marker
MNM Minimum
MNPS Minimum navigation performance specifications
MNT Monitor or monitoring or monitored
MNTN Maintain
MOA Military operating area
MOC Minimum obstacle clearance(required)
MOCA Minimum obstacle clearance Altitude
MOD Moderate(used to indicate the intensity of weather phenomena, interference or static reports, e,g. MODRA=moderate rain)
MON Above mountains
MON Monday
MOPS Minimum operational performance standards
MOV Move or moving or movement
MPS Meters per second
MRA Minimum reception altitude
MRG Medium range
MRP ATS/MET reporting point
MS Minus
MSA Minimum sector altitude
MSG Message
MSL Mean sea level
MSSR Monopulse secondary surveillance radar
MT Mountain
MTU Metric units
MTW Mountain waves
MVDF Medium and very high frequency direction finding stations(at the same location)
MWO Meteorological watch office
MX Mixed type of ice formation(white and clear)
N - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
N North or northern latitude
N No distinct tendency(in RVR during previous 10 minutes)
NASC National AIS system center
NAT North Atlantic
NAV Navigation
NB Northbound
NBFR Not before
NC No change
NDB Non-directional radio beacon
NE North-east
NEB North-east bound
NEG No or negative or permission not granted or that is not correct
NGT Night
NIL None or I have nothing to send you
NM Nautical miles
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 concerned with flight operations
NOV November
NOZ Normal operating zone
NR Number
NRH NO reply heard
NS Nimbostratus
NSC Nil significant cloud
NSW Nil significant weather
NTL National
NTZ No transgression zone
NW North west
NWB North west bound
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
OAS Obstacle assessment surface
OBS Observe or observed or observation
OBSC Obscure or obscured or obscuring
OBST Obstacle
OCA Obstacle clearance altitude
OCC Occulting(light)
OCH Obstacle clearance height
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
OPMET Operational meteorological(information)
OPN Open or opening or opened
OPR Operater or operate or operative or operating or operational
OPS Operations
OTLK Outlook(used in SIGMET message for valcanic ash and tropical cyclones)
OTP On top
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... Prohibited area(followed by identification)
PALS Precision approach lighting system(specify category)
PANS Procedures for air navigation services
PAPI Precision approach path indictor
PAR Precisoin approach radar
PARL Parallel
PAX Passenger(s)
PBN Performance-based navigation
PCD Proceed or proceeding
PCL Pilot-controlled lighting
PCN Pavement classification number
PDC Pre-departure clearance
PDG Procedure design gradient
PE Ice pellets
PER Performance
PERM Permanent
PIB Pre-flight information bulletin
PJE Parachute jumping exercise
PL Ice pellets
PLA Practice low approach
PLN Flight plan
PLVL Present level
PN Prior notice required
PNR Point of no return
PO Dust/sand whirls(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
PSP Pierced steel plank
PSR Primary surveillance radar
PSYS Pressure system(s)
PTN Procedure turn
PTS Polar track structure
PWR Power
Q - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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
R... Restricted area(followed by identification)
R... Right(preceded by runway designation number to identify a parallel runway)
R... Runway(followed by figures in METAR/SPECI)
RA Rain
RAC Rules of the air and air traffic services
RAFC Regional area forecast center
RAG Runway arresting gear
RAI Runway alignment indicator
RAIM Receiver autonomous integrity monitoring
RASC Regional AIS system center
RB Rescue boat
RCA Reach cruising altitude
RCC Rescue coordination center
RCF Radiocommunication failure(message type designator)
RCH Reach or reaching
RCL Runway center line
RCLL Runway center line light(s)
RCLR Recleared
RDH Reference datum height
RDL Radial
RDO Radio
RE... Recent(used to qualify weather phenomena such as rain, e.g. recent rain=RERA)
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
RG Range(lights)
RHC Right-hand circuit
RIF Reclearance in flight
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
RMK Remark
RNAV Area navigation
RNG Radio range
RNP Required navigation performance
ROBEX Regional OPMET bulletin exchange (scheme)
ROC Rate of climb
ROD Rate of descent
ROFOR Route forecast(in meteorological code)
RON Receiving only
RPI Radar position indicator
RPL Repetitive flight plan
RPLC Replace or replaced
RPS Radar positon symbol
RQMNTS Requirements
RQP Request flight plan(message type designator)
RQS Request supplementary flight plan(message type designator)
RR Report reaching
RRA Delayed meteorological message (message type designator)
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)
RUT Standard regional route transmitting frequencies
RV Rescue vessel
RVR Runway visual range
RVSM Reduced vertical seperation minimum(300m(1000FT) between FL290 and FL410)
RWY Runway
RX Receiver
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 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
SBAS Satellite-based augmentation system
SC Stratocumulus
SCT Scattered
SDBY Stand by
SDF Step down Fix
SE South-east
SEB South-east bound
SEC Seconds
SECT Sector
SELCAL Selective calling system
SEP September
SER Service or servicing or served
SEV Severe(used e.g. to qualify icing and turbulence reports)
SFC Surface
SG Snow grains
SGL Signal
SH... Showers(followed by RA=rain, SN=snow, 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 30,000Mhz)
SID Standard instrument departure
SIF Selective identification feature
SIG Significant
SIGMET Information concerning en-route weather phenomena which may affect the safety of aircraft operation
SIGWX Significant weather
SIMUL Simultaneous or simultaneously
SIWL Single isolated wheel load
SKC Sky clear
SKED Schedule or scheduled
SLP Speed limiting point
SLW Slow
SMC Surface movement control
SMR Surface movement radar
SN Snow
SNOWTAM Special series NOTAM notifying the presence or removal of hazardous conditions due to snow, ice, slush or standing water associated with snow, slush and ice on the movement area, by means of a specific format
SPD** Speed
SPECI Aerodrome special meteorological report(in meteorological code)
SPECIAL Special meteorological report(in abbreviated plan language)
SPL Supplementary flight plan(message type designator)
SPOC SAR point of contact
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 Sunset
SS Sandstorm
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 procedure
SVC Service message
SVCBL Serviceable
SW South-west
SW South-westbound
SWY Stopway
T - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
T Temperature
T-VASIS T visual approach slope indicator system
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
TC Tropical cyclone
TCH Threshold crossing height
TCU Towering cumulus
TDO Tornado
TDZ Touchdown zone
TECR Technical reason
TEL Telephone
TEMPO Temporary or temporarily
TEND Trend forecast
TF(Path Descriptor) Track to a Fix
TFC Traffic
TGL Touch-and-go landing
TGS Taxiing guidance system
THR Threshold
THRU Through
THU Thursday
TIBA Traffic information broadcast by aircraft
TIL Until
TIP Until past...(place)
TKOF Take off
TL... Till(followed by time by which weather change is forest 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 airspace
TRANS Transmits or transmitter
TRL Transition level
TROP Tropopause
TS Thunderstorm (in aerodrome reports and forecasts, TS used alone means thunder heard but no precipitation as the aerodrome)
TS... Thunderstorm (followed by RA=rain, SN=snow, PE=icepellets, GR=hail, GS=small hair and/or snow pellets or combinations thereof, e.g. TSRASN=thunderstorm with rain and snow)
TT Teletypewriter
TUE Tuesday
TURB Turbulence
TVOR Terminal VOR
TWR Aerodrome control tower or aerodrome control
TWY Taxiway
TWYL Taxiway-link
TX Transmitter
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/S Unserviceable
UAB Until advised by...
UAC Upper area control center
UAR Upper air route
UDF Ultra high frequency direction-finding station
UFN Until further notice
UHDT Unable higher due traffic
UHF Ultra high frequency(300 to 3,000Mhz)
UIC Upper information centre
UIR Upper fight information region
ULR Ultra long range
UNA Unable
UNAP Unable to approve
UNL Unlimited
UNREL Unreliable
UTA Upper control area
UTC Co-ordinated universal time
V - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
VA Volcanic ash
VAC Visual approach chart(followed by name/title)
VAL In valleys
VAL Visual approach and landing chart
VAN Runway control van
VAR Magnetic variation
VAR Visual-aural radio range
VASIS Visual approach slope indicator system
VC Vicinity of the aerodrome(followed by, FG =fog, FC =funnelcloud, SH = shower, PO = dudsand whirls, BLDU = blowing dust, BLSA = blowing sand, BLSN = blowing snow, DS = duststorm, SS = sandstorm, TS = thunderstorm or VA = volcanic ash,e.g. VCFG = vicinity fog)
VCY Vicinity
VDF Very high frequency direction-finding station
VER Vertical
VFR Visual flight rules
VHF Very high frequency(30 to 300Mhz)
VIP Very important person
VIS Visibility
VLF Very low frequency(3 to 30 KHz)
VLR Very long range
VMC Visual meteorological conditions
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
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 center
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
WIND Wind
WINTEM Forecast upper wind and temperature for aviation
WIP Work in progress
WKN Weaken or weakening
WNW West north west
WO Without
WPT Way-point
WRNG Warning
WS Wind shear
WSPD Wind speed
WSW West south west
WT Weight
WTSPT Waterspout
WWW World wide web
WX Weather
X - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
X Cross
XBAR Crossbar(of approach lighting system)
XNG Crossing
XS Atmospherics
Y - A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Y Yellow
YCZ Yellow caution zone(runway lighting)
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 message)