ICAO Abbreviations and Codes
ICAO Abbreviations and Codes
ICAO Abbreviations and Codes
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<strong>Abbreviations</strong> — Decode 1-15<br />
TDZ<br />
TECR<br />
TEL<br />
TEMPO†<br />
TF<br />
TFC<br />
TGL<br />
TGS<br />
THR<br />
THRU<br />
THU<br />
TIBA†<br />
TIL†<br />
TIP<br />
TKOF<br />
TL . . .<br />
TLOF<br />
TMA‡<br />
TN . . .<br />
TNA<br />
TNH<br />
TO . . .<br />
TOC<br />
TODA<br />
TODAH<br />
TOP†<br />
TORA<br />
TOX<br />
TP<br />
TR<br />
TRA<br />
TRANS<br />
TREND†<br />
TRL<br />
TROP<br />
TS<br />
Touchdown zone<br />
Technical reason<br />
Telephone<br />
Temporary or temporarily<br />
Track to fix<br />
Traffic<br />
Touch-<strong>and</strong>-go l<strong>and</strong>ing<br />
Taxiing guidance system<br />
Threshold<br />
Through<br />
Thursday<br />
Traffic information broadcast by aircraft<br />
Until<br />
Until past . . . (place)<br />
Take-off<br />
Till (followed by time by which weather<br />
change is forecast to end)<br />
Touchdown <strong>and</strong> lift-off area<br />
Terminal control area<br />
Minimum temperature (followed by<br />
figures in TAF)<br />
Turn altitude<br />
Turn height<br />
To . . . (place)<br />
Top of climb<br />
Take-off distance available<br />
Take-off distance available, helicopter<br />
Cloud top<br />
Take-off run available<br />
Toxic<br />
Turning point<br />
Track<br />
Temporary reserved airspace<br />
Transmits or transmitter<br />
Trend forecast<br />
Transition level<br />
Tropopause<br />
Thunderstorm (in aerodrome reports <strong>and</strong><br />
forecasts, TS used alone means<br />
thunder heard but no precipitation at<br />
the aerodrome)<br />
TS . . .<br />
TSUNAMI†<br />
TT<br />
TUE<br />
TURB<br />
T-VASIS†<br />
TVOR<br />
TWR<br />
TWY<br />
TWYL<br />
TX . . .<br />
TXT*<br />
TYP<br />
TYPH<br />
U<br />
Thunderstorm (followed by RA = rain,<br />
SN = snow, PL = ice pellets, GR =<br />
hail, GS = small hail <strong>and</strong>/or snow<br />
pellets or combinations thereof, e.g.<br />
TSRASN = thunderstorm with rain <strong>and</strong><br />
snow)<br />
Tsunami (used in aerodrome warnings)<br />
Teletypewriter<br />
Tuesday<br />
Turbulence<br />
(to be pronounced “TEE-VASIS”) T visual<br />
approach slope indicator system<br />
Terminal VOR<br />
Aerodrome control tower or aerodrome<br />
control<br />
Taxiway<br />
Taxiway-link<br />
Maximum temperature (followed by<br />
figures in TAF)<br />
Text (when the abbreviation is used to<br />
request a repetition, the question mark<br />
(IMI) precedes the abbreviation, e.g.<br />
IMI TXT) (to be used in AFS as a<br />
procedure signal)<br />
Type of aircraft<br />
Typhoon<br />
U<br />
Upward (tendency in RVR during previous<br />
10 minutes)<br />
UA<br />
Unmanned aircraft<br />
UAB . . . Until advised by . . .<br />
UAC Upper area control centre<br />
UAR Upper air route<br />
UAS Unmanned aircraft system<br />
UDF Ultra high frequency direction-finding<br />
station<br />
UFN Until further notice<br />
UHDT Unable higher due traffic<br />
UHF‡ Ultra high frequency [300 to 3 000 MHz]<br />
UIC<br />
Upper information centre<br />
UIR‡ Upper flight information region<br />
ULR Ultra long range<br />
UNA Unable<br />
___________________<br />
† When radiotelephony is used, the abbreviations <strong>and</strong> terms are transmitted as spoken words.<br />
‡ When radiotelephony is used, the abbreviations <strong>and</strong> terms are transmitted using the individual letters in non-phonetic form.<br />
* Signal is also available for use in communicating with stations of the maritime mobile service.<br />
# Signal for use in the teletypewriter service only.<br />
18/11/10
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