|
Definition
|
Contraction
|
Usage
|
|
T
visual approach slope indicator system
|
TVASIS
|
ICAO
|
|
TACAN
only
|
TAO
|
ATC
|
|
tactical
air command liaison officer
|
TACLO
|
GEN
|
|
tactical
air navigation
|
TACR
|
GEN
|
|
tactical
air navigational aid
|
TACAN
|
ICAO
|
|
tactical
customer advocate
|
TCA
|
ATC
|
|
tail
wind
|
TAIL
|
ICAO
|
|
tailwind
|
TLWD
|
ATC
|
|
takeoff
|
TKOF
|
ICAO
|
|
takeoff
distance available
|
TODA
|
ICAO
|
|
takeoff
gross weight
|
TOG
|
GEN
|
|
takeoff
run available
|
TORA
|
ICAO
|
|
tandum
|
TAND
|
GEN
|
|
taxiing
|
TXG
|
ATC
|
|
taxiing
guidance system
|
TGS
|
ICAO
|
|
taxiway
|
TWY
|
ICAO
|
|
taxiway
link
|
TWYL
|
ICAO
|
|
team
supervisor
|
TS
|
GEN
|
|
Technical
Center, FAA
|
ACT
|
GEN
|
|
technical
reason
|
TECR
|
ICAO
|
|
technical
standard order
|
TSO
|
GEN
|
|
teleautograph
|
TELAU
|
GEN
|
|
telecommunications
|
TEL
|
GEN
|
|
telegraph
reply
|
TELRY
|
GEN
|
|
Telemetry
|
TLM
|
ATC
|
|
telephone
|
FONE
|
GEN
|
|
telephone
|
TEL
|
ICAO
|
|
telephone
company
|
TELCO
|
GEN
|
|
telephone
conference
|
TELCON
|
GEN
|
|
telephone
exchange
|
TELEX
|
GEN
|
|
teletype
switching facilities
|
TTS
|
GEN
|
|
teletypewriter
|
TT
|
GEN
|
|
teletypewriter
communications out of service
|
TYPNO
|
GEN
|
|
teletypewriter
communications returned to service
|
TYPOK
|
GEN
|
|
teletypewriter
exchange service
|
TWX
|
GEN
|
|
teletypewriter
station
|
TTY
|
GEN
|
|
temperature
|
T
|
ICAO
|
|
temperature
|
TEMP
|
GEN
|
|
temperature
(PIREP only)
|
TA
|
ATC
|
|
temporary
|
TEMPO
|
ICAO
|
|
temporary
|
TMPRY
|
GEN
|
|
temporary
appointment pending establishment of a register
|
TAPER
|
GEN
|
|
temporary
duty
|
TDY
|
GEN
|
|
temporary
flight restriction
|
TFR
|
GEN
|
|
temporary
reserved airspace
|
TRA
|
ICAO
|
|
tendency
|
TNDCY
|
GEN
|
|
tentative
|
TNTV
|
GEN
|
|
terminal
|
TRML
|
GEN
|
|
terminal
area chart
|
TAC
|
GEN
|
|
terminal
area surveillance radar
|
TAR
|
ICAO
|
|
terminal
area surveillance radar
|
TASR
|
GEN
|
|
terminal
automated radar services
|
TARS
|
GEN
|
|
terminal
communications
|
TCOM
|
GEN
|
|
terminal
control area
|
TCA
|
GEN
|
|
terminal
control area
|
TMA
|
ICAO
|
|
Terminal
Data Link System
|
TDLS
|
GEN
|
|
Terminal
Doppler Weather Radar
|
TDWR
|
ATC
|
|
terminal
forecast
|
TAF
|
METAR
|
|
terminal
information processing system
|
TIPS
|
GEN
|
|
terminal
instrument procedures
|
TERPS
|
GEN
|
|
terminal
radar
|
TRAD
|
GEN
|
|
terminal
radar approach control facility
|
TRACON
|
GEN
|
|
terminal
radar approach control in tower cab
|
TRACAB
|
GEN
|
|
terminal
radar service area
|
TRSA
|
GEN
|
|
terminal
secondary radar beacon
|
TSEC
|
GEN
|
|
terminal
VOR
|
TVOR
|
GEN
|
|
terminate
|
TRMT
|
GEN
|
|
terrain
|
TRRN
|
GEN
|
|
terrain
following
|
TF
|
GEN
|
|
Tethered
Aerostat Radar System
|
TARS
|
GEN
|
|
tetrahedron
|
TET
|
GEN
|
|
Text
|
TXT
|
ICAO
|
|
The
last message received by me was ….
|
LR
|
ICAO
|
|
The
last message sent by me was …or last message was …
|
LS
|
ICAO
|
|
thereafter
|
THRFTR
|
GEN
|
|
thick
|
THK
|
NWS
|
|
thin
|
THN
|
NWS
|
|
This
is a channelcontinuitycheck of
transmission to permit comparison of your record of channel
sequence numbers of messages received on the channel
|
CH
|
ICAO
|
|
This
is a duplicate message (to be used in AFS as a procedure
signal)
|
DUPE
|
ICAO
|
|
thousand
|
THSD
|
GEN
|
|
threaten
|
THTN
|
GEN
|
|
threshold
|
THLD
|
GEN
|
|
threshold
|
THR
|
ICAO
|
|
threshold
crossing height
|
TCH
|
GEN
|
|
threshold
crossing height downwind
|
TCHD
|
GEN
|
|
threshold
crossing height upwind
|
TCHU
|
GEN
|
|
through
|
THRU
|
GEN
|
|
throughout
|
THRUT
|
GEN
|
|
thunder
|
THDR
|
NWS
|
|
thunderhead
|
THD
|
NWS
|
|
thunderstorm
|
TS
|
METAR
|
|
thunderstorm
|
TSTM
|
NWS
|
|
thunderstorm
information not available
|
TSNO
|
METAR
|
|
thunderstorm
with duststorm or sandstorm
|
TSSA
|
METAR
|
|
thunderstorm
with hail
|
TSGR
|
METAR
|
|
thunderstorm
with ice pellets
|
TSPL
|
METAR
|
|
thunderstorm
with rain
|
TSRA
|
METAR
|
|
thunderstorm
with small hail
|
TSGS
|
METAR
|
|
thunderstorm
with snow
|
TSSN
|
METAR
|
|
Thursday
|
THU
|
ICAO
|
|
time
(PIREP only)
|
TM
|
ATC
|
|
time
and altitude over
|
TAO
|
ATC
|
|
time
and attendance report
|
TANDA
|
GEN
|
|
time
check
|
TC
|
ATC
|
|
time
delay
|
TDEL
|
GEN
|
|
Time
Dilution of Precision
|
TDOP
|
ATC
|
|
time
of delivery
|
TOD
|
GEN
|
|
time
of receipt
|
TOR
|
GEN
|
|
time
of transmission
|
TOT
|
GEN
|
|
to
be continued
|
TOC
|
GEN
|
|
today
|
TDA
|
GEN
|
|
tolerance
|
TLRNC
|
GEN
|
|
tomorrow
|
TMW
|
GEN
|
|
tonight
|
TNGT
|
GEN
|
|
too
long to print
|
TLTP
|
GEN
|
|
top
of climb
|
TOC
|
ICAO
|
|
top
of overcast
|
TOVC
|
NWS
|
|
topping
|
TPG
|
NWS
|
|
tornado
|
TDO
|
ICAO
|
|
tornado/water
spout
|
+FC
|
METAR
|
|
total
aboard
|
TA
|
GEN
|
|
touch
and go landing
|
TGL
|
ICAO
|
|
touchdown
|
TD
|
ATC
|
|
touchdown
zone
|
TDZ
|
ICAO
|
|
touchdown
zone elevation
|
TDZE
|
ATC
|
|
touchdown
zone light (system)
|
TDZL
|
GEN
|
|
toward
|
TWD
|
GEN
|
|
tower
|
TWR
|
GEN
|
|
tower
en route control
|
TEC
|
ATC
|
|
tower
en route control area
|
TECA
|
ATC
|
|
towering
|
TWRG
|
NWS
|
|
towering
cumulus
|
TCU
|
NWS
|
|
trace
(weather reports only)
|
T
|
NWS
|
|
track
|
TR
|
ICAO
|
|
traffic
|
TFC
|
ICAO
|
|
traffic
alert and collision avoidance system
|
TCAS
|
GEN
|
|
traffic
flow management system
|
TFMS
|
ATC
|
|
Traffic
information broadcast by aircraft
|
TIBA
|
ICAO
|
|
traffic
management
|
TM
|
ATC
|
|
traffic
management program alert
|
TMPA
|
ATC
|
|
traffic
on request
|
TOR
|
ATC
|
|
traffic
pattern altitude
|
TPA
|
ATC
|
|
traffic
received
|
TFRCD
|
ATC
|
|
traffic
zone
|
TFZ
|
GEN
|
|
training
|
T
|
GEN
|
|
training
|
TRNG
|
GEN
|
|
TransAtlantic
|
TSATLC
|
GEN
|
|
transcontinental
|
TCNTL
|
GEN
|
|
transcribed
weather broadcast
|
TWEB
|
GEN
|
|
transfer
|
TSFR
|
GEN
|
|
transfer
of control point
|
TCP
|
ATC
|
|
transient
|
TRAN
|
ATC
|
|
transient
|
TSNT
|
GEN
|
|
transition
|
TRSN
|
GEN
|
|
transition
altitude
|
TA
|
ICAO
|
|
transition
level
|
TRLVL
|
ICAO
|
|
transmit
|
TMT
|
GEN
|
|
transmit
or transmitter
|
TRANS
|
ICAO
|
|
transmitter
distributor
|
TD
|
GEN
|
|
transmitter
station
|
TS
|
GEN
|
|
transmitting
capability out of service
|
TSMNO
|
GEN
|
|
transmitting
capability returned to service
|
TSMOK
|
GEN
|
|
TransPacific
|
TSPAC
|
GEN
|
|
transponder
|
PARROT
|
GEN
|
|
transponder
inoperative
|
TINOP
|
ATC
|
|
transport
|
TRNSP
|
GEN
|
|
Transport
OneSecretary of Transportation
|
DOT1
|
ATC
|
|
Transport
TwoDeputy Secretary of
Transportation
|
DOT2
|
ATC
|
|
transportation
request
|
T/R
|
GEN
|
|
Transportation
Security Administration
|
TSA
|
GEN
|
|
trapping
layer
|
TRPLYR
|
NWS
|
|
travel
|
TVL
|
GEN
|
|
travel
arrangements without government expense
|
TAWOG
|
GEN
|
|
travel
order
|
TO
|
GEN
|
|
treated
|
TRTD
|
GEN
|
|
trend
|
TEND
|
ICAO
|
|
tributary
|
TRIB
|
NWS
|
|
tricolor
visual approach slope indicator
|
TRCV
|
GEN
|
|
tropical
|
TRPCL
|
NWS
|
|
tropical
(air mass)
|
T
|
NWS
|
|
tropical
continental (air mass)
|
TRPCD
|
NWS
|
|
tropical
cyclone
|
TC
|
ICAO
|
|
tropopause
|
TROP
|
NWS
|
|
trouble
|
TRBL
|
GEN
|
|
trough
|
TROF
|
NWS
|
|
true
(bearing)
|
T
|
GEN
|
|
true
air speed
|
TAS
|
GEN
|
|
true
bearing
|
QTE
|
ICAO
|
|
Tuesday
|
TUE
|
ICAO
|
|
turbojet
|
TBJT
|
GEN
|
|
turbulence
|
TURB
|
ICAO
|
|
turbulence
|
TURBC
|
NWS
|
|
turbulence
(PIREP only)
|
TB
|
ATC
|
|
turbulent
|
TURBT
|
NWS
|
|
turn
altitude
|
TNA
|
ICAO
|
|
turn
around
|
TARND
|
ATC
|
|
turn
height
|
TNH
|
ICAO
|
|
turn
left after takeoff
|
LT
|
ATC
|
|
Turning
point
|
TP
|
ICAO
|
|
Twilight
|
TWI
|
GEN
|
|
type
aircraft
|
TYP
|
ICAO
|
|
type
aircraft (PIREP only)
|
TP
|
ATC
|
|
Typhoon
|
TYPH
|
ICAO
|