|
A
|
|
A
|
Amber |
|
A/A
|
Air-to-air |
|
A/G
|
Air-to-ground |
|
AAA
|
(or AAB, AAC . . . etc., in sequence)Amended meteorological message (message type designator) |
|
*AAC
|
Aeronautical administrative communications |
|
AAD
|
Assigned altitude deviation |
|
AAIM
|
Aircraft autonomous integrity monitoring |
|
AAL
|
Above aerodrome level |
|
AAR
|
Air to air refuelling |
|
*AB
|
Air base |
|
*ABAS
|
Aircraft-based augmentation system |
|
*ABC
|
Air base commander |
|
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
|
(to be pronounced "AY-CAS") Airborne collision avoidance system |
|
ACC
|
Area control center or area control |
|
ACCID
|
Notification of an aircraft accident |
|
ACFT
|
Aircraft |
|
ACK
|
Acknowledge |
|
ACL
|
Altimeter check location |
|
ACN
|
Aircraft classification number |
|
ACP
|
Acceptance (message type designator) |
|
ACPT
|
Accept or accepted |
|
*ACSE
|
Application control service element |
|
ACT
|
Active or activated or activity |
|
AD
|
Aerodrome |
|
ADA
|
Advisory area |
|
ADC
|
Aerodrome chart |
|
AD
|
Aerodrome office ( specify service ) |
|
ADDN
|
Addition or additional |
|
ADF
|
Automatic direction-finding equipment |
|
*ADI
|
Administrative domain identifier |
|
ADIZ
|
(to be pronounced "AY-DIZ") Air Defence identification zone |
|
ADJ
|
Adjacent |
|
*ADM
|
Administrative identifier |
|
*ADNC
|
Air Defence notification center |
|
ADO
|
Aerodrome office (specify service) |
|
ADR
|
Advisory route |
|
ADS-C
|
Automatic dependent surveillance contract |
|
ADSU
|
Automatic dependent surveillance unit |
|
ADVS
|
Advisory service |
|
ADZ
|
Advise |
|
*AE
|
Application entity |
|
AES
|
Aircraft earth station |
|
*AFI
|
Authority and format identifier |
|
AFIL
|
Flight plan filed in the air |
|
AFIS
|
Aerodrome flight information service |
|
*AFL
|
Airfield lighting |
|
AFM
|
Yes or affirm or affirmative or that is correct |
|
AFS
|
Aeronautical fixed service |
|
AFT
|
After . . . (followed 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 |
|
*AI
|
Aircraft identifier |
|
AIC
|
Aeronautical information circular |
|
AIDC
|
Air traffic services interfacility data communications |
|
AIM
|
Aeronautical information Management |
|
*AINSC
|
Aeronautical industry services communication |
|
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 |
|
*ALSF1
|
Approach lighting system with sequenced flashing lights, category I configration. |
|
*ALSF2
|
Approach lighting system with sequenced flashing lights, category II configration. |
|
ALT
|
Altitude |
|
ALTN
|
Alternate or alternating (light alternates in color) |
|
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 by name / title ) |
|
ANS
|
Answer |
|
*ANT
|
Antenna |
|
AO
|
Aircraft operator |
|
*AOA
|
Aerodrome operating authority |
|
AOC . . .
|
Aerodrome obstacle chart (followed by type and name / title) |
|
*AOP
|
ATN OSI profile AOR |
|
*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 |
|
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) |
|
*ARS
|
Administrative region selector |
|
ARST
|
Arresting (specify [ part of ] aircraft arresting equipment) |
|
AS
|
Altostratus |
|
ASAP
|
As soon as possible |
|
ASC
|
Ascend to or ascending to |
|
ASDA
|
Accelerate-stop distance available |
|
*ASM
|
Airspace management |
|
*ASN.1
|
Abstract syntax notation one |
|
*ASO
|
Application service object |
|
ASE
|
Altimetry system error |
|
ASHTAM
|
Special series NOTAM notifying by means of specific format change in activity of a volcano, a volcanic eruption and/or volcanic as cloud that is of significance to aircraft operations |
|
ASPH
|
Asphalt |
|
*ASPP
|
Aeronautical fixed service systems planning for data interchange (ASP) panel |
|
*ASR
|
Aerodrome surveillance radar |
|
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 center |
|
ATD
|
Actual time of departure |
|
ATFM
|
Air traffic flow management |
|
ATIS
|
Automatic terminal information service |
|
ATM
|
Air traffic management |
|
ATN
|
Aeronautical telecommunication network |
|
*ATNP
|
Aeronautical telecommunication network panel |
|
ATP . . .
|
At (followed by time or place) |
|
*ATP
|
Airline transport pilot |
|
ATS
|
Air traffic services |
|
*ATSMHS
|
ATS message handling services |
|
*ATSU
|
Air traffic service units |
|
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 |
|
AWTA
|
Advise at what time able |
|
AWY
|
Airway |
|
AZM
|
Azimuth |
|
B
|
|
B
|
Blue |
|
BA
|
Braking action |
|
BASE
|
Cloud base |
|
*BC
|
Back course |
|
*BCD
|
Binary coded decimal |
|
BCFG
|
Fog patches |
|
BCN
|
Beacon (aeronautical ground light) |
|
BCST
|
Broadcast |
|
BDRY
|
Boundary |
|
BECMG
|
Becoming |
|
BFR
|
Before |
|
*BIS
|
Boundary intermediate system |
|
BKN
|
Broken |
|
BL . . .
|
Blowing (followed by DU = dust, SA = s and or SN = snow) |
|
BLDG
|
Building |
|
BLO
|
Below clouds |
|
BLW
|
Below |
|
*BOA/H
|
Break-off altitude/height |
|
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 |
|
C
|
|
C
|
Degrees Celsius (Centigrade) |
|
CA
|
Course to an altitude |
|
CAA
|
Civil aviation authority or civil aviation administration |
|
*CAL
|
Calvert approach lights |
|
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 |
|
CCA
|
(or CCB, CCC . . . etc., in sequence) Corrected meteorological message (message type designator) |
|
CCO
|
Continuous climb operations |
|
*CCITT
|
International telegraph and telephone consultative committee |
|
*CCW
|
Counter-clockwise |
|
CD
|
Candela |
|
CDN
|
Coordination (message type designator) |
|
CDO
|
Continuous desent operations |
|
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 |
|
CHEM
|
Chemical |
|
CHG
|
Modification (message type designator) |
|
*CHGD
|
Changed |
|
CI
|
Cirrus |
|
CIDIN
|
Common ICAO data interchange network |
|
CIV
|
Civil |
|
CK
|
Check |
|
CL
|
Center line |
|
CLA
|
Clear type of ice formation |
|
CLBR
|
Calibration |
|
CLD
|
Cloud / Climb-out |
|
CLG
|
Calling |
|
CLR
|
Clear(s) or cleared to . . . or clearance |
|
CLRD
|
Runway(s) or cleard (used in METAR/SPECI) |
|
CLSD
|
Close or closed or closing |
|
CM
|
Centimeter |
|
CMB
|
Climb to or climbing to |
|
CMPL
|
Completion or completed or complete |
|
CNL
|
Cancel or canceled |
|
CNL
|
Flight plan cancellation (message type designator) |
|
CNS
|
Communications, navigation and surveillance |
|
*CO
|
connection oriented |
|
*COL
|
Column |
|
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 |
|
CRP
|
Compulsory reporting point |
|
CRZ
|
Cruise |
|
CS
|
Call sign |
|
CS
|
Cirrostratus |
|
CTA
|
Control area |
|
CTAM
|
Climb to and maintain |
|
CTC
|
Contact |
|
CTL
|
Control |
|
CTN
|
Caution |
|
CTR
|
Control zone |
|
CU
|
Cumulus |
|
CUF
|
Cumuliform |
|
CUST
|
Customs |
|
CVR
|
Cockpit voice recorder |
|
*CVFR
|
Controlled visual flight rules |
|
CW
|
Continuous wave |
|
*CW
|
Clockwise |
|
CWY
|
Clearway |
|
D
|
|
D . . .
|
Danger area (followed by identification) |
|
D
|
Downward (tendency in RVR during previous 10 minutes) |
|
DA
|
Decision altitude |
|
D-ATIS
|
(To be pronounced "DEE-ATIS") Data link authomatic terminal information service |
|
DCD
|
Double channel duplex |
|
*DCE
|
Data communications equipment |
|
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) |
|
DEC
|
December |
|
DE
|
From (used to precede the call sign of the calling station) (to be used in AFS as a procedure signal) |
|
DEG
|
Degrees |
|
DEP
|
Depart or departure |
|
DEP
|
Departure (message type designator) |
|
DER
|
Departure end of 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 (message type designator) |
|
DLA
|
Delay or delayed |
|
DLIC
|
Data link initiation on capability |
|
DLY
|
Daily |
|
DME
|
Distance measuring equipment |
|
DNG
|
Danger or dangerous |
|
*DNIC
|
Data network identification code |
|
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 |
|
*DTE
|
Data terminal equipment |
|
DTG
|
Date-time group |
|
DTHR
|
Displaced runway threshold |
|
DTRT
|
Deteriorate or deteriorating |
|
DTW
|
Dual tandem wheels |
|
DU
|
Dust |
|
DUC
|
Dense upper cloud |
|
DUR
|
Duration |
|
D-VOLMET
|
Data link VOLMET |
|
DVOR
|
Doppler VOR |
|
DW
|
Dual wheels |
|
*DX
|
Duplex operation |
|
DZ
|
Drizzle |
|
E
|
|
E
|
East or eastern longitude |
|
EAT
|
Expected approach time |
|
EB
|
Eastbound |
|
EDA
|
Elevation differentail area |
|
EET
|
Estimated elapsed time |
|
EFC
|
Expect further clearance |
|
EFIS
|
(to be pronounced "EE-FIS") Electronic flight instrument system |
|
*EFF
|
Effective |
|
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 |
|
*EPIRB
|
Emergency position indicating radio beacon |
|
EQPT
|
Equipment |
|
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
|
Exercises or exercising or to exercise |
|
EXP
|
Expect or expected or expecting |
|
EXTD
|
Extend or extending |
|
*EXTN
|
Extension |
|
F
|
|
F
|
Fixed |
|
FA
|
Course from a fix to an altitude |
|
FAC
|
Facilities |
|
*FAC
|
Final approach course |
|
FAF
|
Final approach fix |
|
FAL
|
Facilitation of international air transport |
|
*FANS
|
Future air navigation system |
|
FAP
|
Final approach point |
|
FAS
|
Final approach segment |
|
FATO
|
Final approach and take-off area |
|
FAX
|
Facsimile transmission |
|
FBL
|
Light (used to indicate the intensity of weather phenomena, interference or static reports, e.g. FBL RA = light rain) |
|
FC
|
Funnel cloud (tornado or water spout) |
|
FCST
|
Forecast |
|
FCT
|
Friction coefficient |
|
*FE
|
Flight Engineer |
|
FEB
|
February |
|
FG
|
Fog |
|
*FIB
|
Forwarding information base |
|
FIC
|
Flight information center |
|
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 weather change is forecast to begin) |
|
FMC
|
Flight management computer |
|
*FMS
|
Flight management system |
|
FMU
|
Flow management unit |
|
FNA
|
Final approach |
|
FPL
|
Flight plan |
|
FPM
|
Feet per minute |
|
FPR
|
Flight plan route |
|
FR
|
Fuel remaining |
|
FREQ
|
Frequency |
|
FRI
|
Friday |
|
FRNG
|
Firing |
|
FRONT
|
Front (relating to weather |
|
FROST
|
Frost (used in aerodrome warnings) |
|
FRQ
|
Frequent |
|
*FRS
|
Fire and Rescue Services |
|
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 |
|
FZ
|
Freezing |
|
FZDZ
|
Freezing drizzle |
|
FZFG
|
Freezing fog |
|
FZRA
|
Freezing rain |
|
G
|
|
G
|
Green |
|
*GA
|
General aviation |
|
*GACA
|
General Authority of Civil Aviation |
|
GAIN
|
Airspeed or headwind gain |
|
GAMET
|
Area forecast for low-level flights |
|
GARP
|
GBAS azimuth reference point |
|
GBAS
|
(to be pronounced “GEE-BAS”) Ground-based augmentation system |
|
GCA
|
Ground controlled approach system or ground controlled approach |
|
GEN
|
General |
|
GEO
|
Geographic or true |
|
GES
|
Ground earth station |
|
GLD
|
Glider |
|
GLONASS
|
(to be pronounced "GLD-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 |
|
GRIB
|
Processed meteorological data in the form of grid point values expressed in binary form (in meteorological code) |
|
GRVL
|
Gravel |
|
GS
|
Ground speed |
|
GS
|
Small hail and/or snow pellets |
|
GUND
|
Geoid undulation |
|
H
|
|
H
|
High pressure area or the center of high pressure |
|
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 |
|
HDG
|
Heading |
|
HEL
|
Helicopter |
|
HF
|
Holding/racetrack to a fix |
|
HF
|
High frequency [3 000 to 30 000 KHZ] |
|
HGT
|
Height or height above |
|
*HIRL
|
High intensity runway lighting system |
|
HJ
|
Sunrise to sunset |
|
HLDG
|
Holding |
|
HLP
|
Heliport |
|
HLS
|
Helicopter landing site |
|
HM
|
Holding/racetrack to a manual termination |
|
HN
|
Sunset to sunrise |
|
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 |
|
HUD
|
Head-up display |
|
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) |
|
HX
|
No specific working hours |
|
HYR
|
Higher |
|
HZ
|
Haze |
|
HZ
|
Hertz (cycle per second) |
|
I
|
|
IAC
|
Instrument approach chart |
|
IAF
|
Initial approach fix |
|
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 |
|
*ICAO
|
International Civil Aviation Organization |
|
ICE
|
Icing |
|
ID
|
Identifier or identify |
|
IDENT
|
Identification |
|
IF
|
Intermediate approach fix |
|
IFF
|
Identification friend/foe |
|
IFR
|
Instrument flight rules |
|
IGA
|
International general aviation |
|
ILS
|
Instrument landing system |
|
IM
|
Inner marker |
|
IMC
|
Instrument meteorological conditions |
|
IMG
|
Immigration |
|
*IMI
|
Interrogation sign (question mark) to be used in AFS as 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 |
|
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
|
|
JAN
|
January |
|
JTST
|
Jet stream |
|
JUL
|
July |
|
JUN
|
June |
|
K
|
|
KG
|
Kilograms |
|
KHZ
|
Kilohertz |
|
KIAS
|
Knots indicated airspeed |
|
KM
|
Kilometers |
|
KMH
|
Kilometers per hour |
|
KPA
|
Kilopascal |
|
*KSA
|
Kingdom of Saudi Arabia |
|
KT
|
Knots |
|
KW
|
Kilowatts |
|
L
|
|
L
|
LITRE |
|
L
|
Locator |
|
L
|
Low pressure area or the center of low pressure |
|
LAM
|
Logical acknowledgment (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 |
|
*LHC
|
Left hand circuit |
|
LIH
|
Light intensity high |
|
LIL
|
Light intensity low |
|
LIM
|
Light intensity medium |
|
LINE
|
Line (used in SIGMET) |
|
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
|
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
|
The last message sent by me was ... or last message was ... (to be used in AFS as a procedure signal) |
|
*LT
|
Left turn |
|
LTA
|
Lower control area |
|
LTD
|
Limited |
|
LTP
|
Landing threshold point |
|
LV
|
Light and variable (relating to wind) |
|
LVE
|
Leave or leaving |
|
LVL
|
Level |
|
LVP
|
Low visibility procedures |
|
LYR
|
Layer or layered |
|
M
|
|
M . . .
|
Mach number (followed by figures) |
|
M . . .
|
minimum value of runway visual range (METAR / SPECI code forms) |
|
MAA
|
Maximum authorized altitude |
|
MAG
|
Magnetic |
|
MAHF
|
Missed approach holding fix |
|
MAINT
|
Maintenance |
|
*MALS
|
Medium intensity approach light system |
|
MAP
|
Aeronautical maps and charts |
|
MAPT
|
Missed approach point |
|
MAR
|
At sea |
|
MAR
|
March |
|
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 |
|
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 |
|
METAR
|
Aerodrome routine meteorological report (in meteorological code) |
|
MET REPORT
|
Local routine meteorological report (in abbreviated plain language) |
|
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 |
|
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) |
|
*MIRLS
|
Medium intensity runway lighting system |
|
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. MOD RA = moderate rain) |
|
MON
|
Above mountains |
|
MON
|
Monday |
|
MOPS
|
Minimum operational performance standards |
|
MOV
|
Move or moving or movement |
|
MPS
|
Meters per second |
|
MRA
|
Minimum reception altitude |
|
MRG
|
Medium range |
|
MRP
|
ATS/MET reporting point |
|
MS
|
Minus |
|
MSA
|
Minimum sector altitude |
|
MSAS
|
(to be pronounced “EM-SAS”) Multifunctional transport satellite (MTSAT) satellite-based augmentation system |
|
MSAW
|
Minimum safe altitude warning |
|
MSG
|
Message |
|
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 |
|
MTOM
|
Maximum take-off mass |
|
*MTOW
|
Maximum take-off weight |
|
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
|
|
N
|
No distinct tendency (in RVR during previous 10 minutes) |
|
N
|
North or northern latitude |
|
NADP
|
Noise abatement departure procedure |
|
NASC
|
National AIS system centre |
|
NAT
|
North Atlantic |
|
NAV
|
Navigation |
|
NAVAID
|
Navigational aid |
|
*NAVBL
|
Not available |
|
NB
|
Northbound |
|
NBFR
|
Not before |
|
NC
|
No change |
|
NCD
|
No cloud detected (used in automated METAR/SPECI) |
|
NDB
|
Non-directional radio beacon |
|
NDV
|
No directional variations available (used in automated METAR / SPECI) |
|
NE
|
North-east |
|
NEB
|
North-eastbound |
|
NEG
|
No or negative or permission not granted or that is not correct |
|
NGT
|
Night |
|
NIL
|
None or I have nothing to send to you |
|
NM
|
Nautical miles |
|
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 |
|
NONSTD
|
Non-standard |
|
NOSIG
|
No significant change (used in trend-type landing forecasts) |
|
NOTAM
|
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 |
|
NR
|
Number |
|
NRH
|
No reply heard |
|
NS
|
Nimbostratus |
|
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
|
|
OAC
|
Oceanic area control center |
|
OAS
|
Obstacle assessment surface |
|
OBS
|
Observe or observed or observation |
|
OBSC
|
Obscure or obscured or obscuring |
|
OBST
|
Obstacle |
|
OCA
|
Obstacle clearance altitude |
|
OCA
|
Oceanic control area |
|
OCC
|
Occulting (light) |
|
OCH
|
Obstacle clearance height |
|
OCNL
|
Occasional or occasionally |
|
OCS
|
Obstacle clearance surface |
|
OCT
|
October |
|
ODALS
|
Omni directional approach lighting systems |
|
*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) |
|
OLDI
|
On-line data interchange |
|
OM
|
Outer marker |
|
OPA
|
Opaque, white type of ice formation |
|
OPC
|
The control indicated is operational control |
|
OPMET
|
Operational meteorological (information) |
|
OPN
|
Open or opening or opened |
|
OPR
|
Operator or operate or operative or operating or operational |
|
OPS
|
Operations |
|
O/R
|
On request |
|
ORD
|
Order |
|
OSV
|
Ocean station vessel |
|
*OTLK
|
Outlook (used in SIGMET messages for volcanic ash and tropical cyclones) |
|
OTP
|
On top |
|
OTS
|
Organized track system |
|
OUBD
|
Outbound |
|
OVC
|
Overcast |
|
P
|
|
P . . .
|
Maximum value of wind speed or runway visual range (used in the METAR / SPECI and TAF code forms) |
|
P . . .
|
Prohibited area (followed by identification) |
|
PA
|
Precision approach |
|
PALS
|
Precision approach lighting system (specify category) |
|
PANS
|
Procedures for air navigation services |
|
PAPI
|
Precision approach path indicator |
|
PAR
|
Precision approach radar |
|
PARL
|
Parallel |
|
PATC . . .
|
Precision approach terrain chart (followed by name / title) |
|
PAX
|
Passenger(s) |
|
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 |
|
PDG
|
Procedure design gradient |
|
PER
|
Performance |
|
PERM
|
Permanent |
|
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 |
|
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 |
|
PROP
|
Propeller |
|
PROV
|
Provisional |
|
PRP
|
Point-in-space reference point |
|
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
|
|
QDL
|
Do you intend to ask me for a series of bearings? or I intend to ask you for a series of bearings (to be used in 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
|
|
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 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 |
|
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 |
|
*RCAG
|
Remote control air/ground |
|
RCC
|
Rescue coordination center |
|
RCF
|
Radio communication failure (message type designator) |
|
RCH
|
Reach or reaching |
|
RCL
|
Runway centerline |
|
RCLL
|
Runway centerline light(s) |
|
RCLR
|
Recleared |
|
RCP
|
Required communication performance |
|
RDH
|
Reference datum height (for ILS ) |
|
RDL
|
Radial |
|
RDO
|
Radio |
|
RDOACT
|
Radioactive |
|
RE . . .
|
Recent (used to qualify weather phenomena, e.g. RERA = recent rain) |
|
REC
|
Receive or receiver |
|
REDL
|
Runway edge light(s) |
|
REF
|
Reference to . . . or refer to . . . |
|
REG
|
Registration |
|
RENL
|
Runway end light(s) |
|
REP
|
Report or reporting or reporting point |
|
REQ
|
Request or requested |
|
RERTE
|
Reroute |
|
RESA
|
Runway end safety area |
|
RF
|
Constant radius arc to a fix |
|
RFFS
|
Rescue and fire fighting services |
|
RG
|
Range (lights) |
|
RHC
|
Right-hand circuit |
|
RIF
|
Reclearance in flight |
|
RIME
|
Rime (used in aerodrome warnings) |
|
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
|
(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) |
|
*RSAF
|
Royal Saudi Air Force |
|
RSC
|
Rescue sub-center |
|
RSCD
|
Runway surface condition |
|
RSP
|
Responder beacon |
|
RSP
|
Required surveillance performance |
|
RSR
|
En-route surveillance radar |
|
RSS
|
Root sum square |
|
*RT
|
Right turn |
|
RTD
|
Delayed (used to indicate delayed meteorological message; message type designator) |
|
RTE
|
Route |
|
RTF
|
Radiotelephone |
|
RTG
|
Radiotelegraph |
|
RTHL
|
Runway threshold light(s) |
|
RTN
|
Return or returned or returning |
|
RTODAH
|
Rejected take-off distance available, helicopter |
|
RTS
|
Return to service |
|
RTT
|
Radio teletypewriter |
|
RTZL
|
Runway touchdown zone light(s) |
|
RUT
|
Standard regional route transmitting frequencies |
|
RV
|
Rescue vessel |
|
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
|
|
S
|
South or southern latitude |
|
S
|
State of the sea (followed by figures in METAR / SPECI) |
|
SA
|
Sand |
|
SALS
|
Short approach lighting system |
|
*SAMCC
|
Saudi Arabian mission control center |
|
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 |
|
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 |
|
SECT
|
Sector |
|
SELCAL
|
Selective calling system |
|
SEP
|
September |
|
SER
|
Service or servicing or served |
|
SEV
|
Severe (used e.g. to qualify icing and turbulence reports) |
|
SFC
|
Surface |
|
SG
|
Snow grains |
|
SGL
|
Signal |
|
SH . . .
|
Showers (followed by RA = rain, SN = snow, PE = ice pellets, GR = hail, GS = small hail and/or snow pellets or combinations thereof, e.g. SHRASN = showers of rain and snow) |
|
SHF
|
Super high frequency [3 000 to 30 000 MHZ] |
|
SI
|
International system of units |
|
SID
|
Standard instrument departure |
|
SIF
|
Selective identification feature |
|
SIG
|
Significant |
|
SIGMET
|
Information concerning enroute 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 |
|
SLP
|
Speed limiting point |
|
SLW
|
Slow |
|
SMC
|
Surface movement control |
|
SMR
|
Surface movement radar |
|
SN
|
Snow |
|
SNOCLO
|
Aerodrome closed due to snow (used in the METAR / SPECI) |
|
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 |
|
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 |
|
SRR
|
Search and rescue region |
|
SRY
|
Secondary |
|
SS
|
Sandstorm |
|
SS
|
Sunset |
|
*SSALR
|
Simplified short approach with RWY alignment indicator lights |
|
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
|
Stop way light(s) |
|
SUBJ
|
Subject to |
|
SUN
|
Sunday |
|
SUP
|
Supplement (AIP Supplement) |
|
SUPPS
|
Regional supplementary procedures |
|
SVC
|
Service (message type only) |
|
SVCBL
|
Serviceable |
|
*SVFR
|
Special VFR |
|
SW
|
South-west |
|
SWB
|
South-westbound |
|
SWY
|
Stop way |
|
*SX
|
Simplex operation |
|
*SYS
|
System identifier |
|
T
|
|
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 |
|
TCAC
|
Tropical cyclone advisory center |
|
TCAS RA
|
(to be pronounced “TEE-CAS-AR-AY”) Traffic alert and collision avoidance system resolution advisory |
|
TCH
|
Threshold crossing height |
|
TCU
|
Towering cumulus |
|
TDO
|
Tornado |
|
TDZ
|
Touchdown zone |
|
TECR
|
Technical reason |
|
TEL
|
Telephone |
|
TEMPO
|
Temporary or temporarily |
|
*TEND
|
Trend forecast |
|
TFC
|
Traffic |
|
TGL
|
Touch-and-go landing |
|
TGS
|
Taxiing guidance system |
|
THR
|
Threshold |
|
THRU
|
Through |
|
THU
|
Thursday |
|
TIBA
|
Traffic information broadcasts by aircraft |
|
TIL
|
Until |
|
TIP . . .
|
Until past . . . (followed by place) |
|
TKOF
|
Take-off |
|
TL . . .
|
Till (followed by time by which weather change is forecast to end) |
|
*TL
|
Transition level |
|
TLOF
|
Touchdown and lift-off area |
|
TMA
|
Terminal control area |
|
TN . . .
|
Minimum temperature (followed by figures in TAF) |
|
TNA
|
Turn altitude |
|
TNH
|
Turn height |
|
TO
|
To . . . (followed by place) |
|
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 |
|
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. TSRASN = thunderstorm with rain and snow ) |
|
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 |
|
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
|
|
U
|
Upward (tendency in RVR during previous 10 minutes) |
|
UA
|
Unmanned aircraft |
|
UAB
|
Until advised by . . . |
|
UAC
|
Upper area control center |
|
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 center |
|
UIR
|
Upper flight information region |
|
ULR
|
Ultra long range |
|
UNA
|
Unable |
|
UNAP
|
Unable to approve |
|
UNL
|
Unlimited |
|
UNREL
|
Unreliable |
|
UP
|
Unidentified precipitation (used in Automated METAR / SPECI) |
|
U/S
|
Unserviceable |
|
UTA
|
Upper control area |
|
UTC
|
Coordinated Universal Time |
|
V
|
|
VA
|
Heading to an altitude |
|
VA
|
Volcanic ash |
|
VAAC
|
Volcanic ash advisory center |
|
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 system |
|
VC . . .
|
Vicinity of the aerodrome (followed by FG = fog, FC = funnel cloud, SH = showers, PO = dust/sand whirls, BLDU = blowing dust, BLSA = blowing sand, BLSN = blowing snow, DS = duststorm, SS = sandstorm, TS = thunderstorm or VA = volcanic ash e.g. VCFG = vicinity fog) |
|
VCY
|
Vicinity |
|
VDF
|
Very high frequency direction-finding station |
|
*VDL
|
Very high frequency data link |
|
VER
|
Vertical |
|
VFR
|
Visual flight rules |
|
VHF
|
Very high frequency [30 to 300 MHZ] |
|
VIP
|
Very important person |
|
VIS
|
Visibility |
|
VLF
|
Very low frequency [3 to 30 KHZ] |
|
VLR
|
Very long range |
|
VM
|
Heading to a manual termination |
|
VMC
|
Visual meteorological conditions |
|
VNAV
|
(to be pronounced “VEE-NAV”) Vertical navigation |
|
VOLMET
|
Meteorological information for aircraft in flight |
|
VOR
|
VHF omni directional radio range |
|
VORTAC
|
VOR and TACAN combination |
|
VOT
|
VOR airborne equipment test facility |
|
VPA
|
Vertical path angle |
|
VPT
|
Visual manoeuver with prescribed track |
|
VRB
|
Variable |
|
VSA
|
By visual reference to the ground |
|
VSP
|
Vertical speed |
|
VTOL
|
Vertical take-off and landing |
|
V V . . .
|
Vertical visibility (followed by figures in METAR/SPECI and TAF) |
|
W
|
|
W
|
West or western longitude |
|
W
|
White |
|
W . . .
|
Sea-surface temperature (followed by figures in METAR/SPECI code forms) |
|
WAAS
|
Wide area augmentation system |
|
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 or wide |
|
WIE
|
With immediate effect or effective immediately |
|
WILCO
|
Will comply |
|
WIND
|
Wind |
|
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
|
Worldwide web |
|
WX
|
Weather |
|
WXR
|
Weather radar |
|
X
|
|
X
|
Cross |
|
XBAR
|
Crossbar (of approach lighting system) |
|
XNG
|
Crossing |
|
XS
|
Atmospherics |
|
Y
|
|
Y
|
Yellow |
|
YCZ
|
Yellow caution zone (runway lighting) |
|
*YES
|
Yes (affirmative) (to be used in AFS as a procedure signal) |
|
YR
|
Your |
|
Z
|
|
Z
|
Coordinated Universal Time (in meteorological messages) |