|
Definition
|
Contraction
|
Usage
|
|
1 or 2
octas (eighths) cloud coverage
|
FEW
|
METAR
|
|
abandon
|
ABND
|
GEN
|
|
abbreviate
|
ABBR
|
GEN
|
|
Abbreviated
precision approach path indicator
|
APAPI
|
ICAO
|
|
Abbreviated
T visual approach slope indicator system
|
ATVASIS
|
ICAO
|
|
abeam
|
ABM
|
GEN
|
|
abnormal
|
ABNML
|
GEN
|
|
aboard
|
ABD
|
GEN
|
|
about
|
ABT
|
GEN
|
|
above
|
ABV
|
GEN
|
|
above
aerodrome level
|
AAL
|
ICAO
|
|
above
clouds
|
ACLD
|
GEN
|
|
above
ground level
|
AGL
|
GEN
|
|
above mean
sea level
|
AMSL
|
GEN
|
|
above
mountains
|
MON
|
ICAO
|
|
above sea
level
|
ASL
|
GEN
|
|
above
transmitted as received
|
ATAR
|
GEN
|
|
absolute
(temperature)
|
A
|
NWS
|
|
abundant
|
ABNDT
|
GEN
|
|
accelerate
|
ACLT
|
GEN
|
|
acceleratestop
distance available
|
ASDA
|
GEN
|
|
accept
|
ACPT
|
GEN
|
|
acceptance
(message type designator)
|
ACP
|
ICAO
|
|
access
|
ACES
|
GEN
|
|
accident
|
ACDNT
|
GEN
|
|
accident
notice
|
ACNOT
|
GEN
|
|
accompany
|
ACPY
|
GEN
|
|
account
|
ACCT
|
GEN
|
|
account
mechanical
|
AMECH
|
GEN
|
|
account
traffic
|
ATFC
|
GEN
|
|
account
weather
|
AWX
|
GEN
|
|
accumulate
|
ACCUM
|
GEN
|
|
acknowledge
|
ACK
|
GEN
|
|
acknowledgement
of receipt (message handling)
|
R
|
GEN
|
|
acrobatic
|
ACRBT
|
ATC
|
|
across
|
ACRS
|
GEN
|
|
acting
|
ACTG
|
GEN
|
|
activate
|
ACTVT
|
GEN
|
|
activate
IFR flight plan
|
AIFP
|
ATC
|
|
activate
VFR flight plan
|
AVFP
|
ATC
|
|
active
|
ACTV
|
GEN
|
|
active or
activated or activity
|
ACT
|
ICAO
|
|
actual
time of arrival
|
ATA
|
ATC
|
|
actual
time of departure
|
ATD
|
ATC
|
|
actual
time of penetration
|
ATP
|
ATC
|
|
actual
time of release
|
ATRLS
|
ATC
|
|
actual
wind factor
|
ALWF
|
NWS
|
|
addition
|
ADDN
|
GEN
|
|
additional
traffic is
|
ADNL TFC
|
ATC
|
|
address
|
ADS
|
GEN
|
|
adequate
|
ADQT
|
GEN
|
|
adirondack
|
ADRNDCK
|
NWS
|
|
adjacent
|
ADJ
|
GEN
|
|
administration
|
ADMIN
|
GEN
|
|
administrative
|
ADMIV
|
GEN
|
|
administrator
|
ADMIR
|
GEN
|
|
advance
|
ADVN
|
GEN
|
|
Advance
boundary information
|
ABI
|
ICAO
|
|
Advanced
Navigation Routes
|
ANR
|
ATC
|
|
advection
|
ADVCTN
|
NWS
|
|
advice
|
ADVC
|
GEN
|
|
advise
|
ADV
|
NWS
|
|
advise
|
ADZ
|
GEN
|
|
advise
arrival
|
ADZAR
|
ATC
|
|
advise at
what time able
|
AAWTA
|
ICAO
|
|
advise by
air mail as soon as possible
|
ADMAP
|
GEN
|
|
advise
customs
|
ADCUS
|
GEN
|
|
advise
disposition
|
ADSPN
|
GEN
|
|
advise if
able
|
AIA
|
ATC
|
|
advise if
able to proceed
|
AAP
|
ATC
|
|
advise if
not correct
|
ADNOK
|
ATC
|
|
advise
intentions
|
ADZI
|
ATC
|
|
advise or
issue instructions to all concerned
|
ADCON
|
GEN
|
|
advise
present position and altitude
|
APPA
|
ATC
|
|
advise
reason for delay
|
ADRDE
|
ATC
|
|
advise
this office
|
ADZOF
|
GEN
|
|
advise
when able
|
AWA
|
ATC
|
|
advise
when established
|
AWE
|
ATC
|
|
advisory
|
ADVY
|
NWS
|
|
advisory
|
ADZY
|
GEN
|
|
advisory
|
ADZY
|
ATC
|
|
advisory
|
ADVZY
|
ATC
|
|
advisory
area
|
ADA
|
ATC
|
|
Advisory
Circular
|
AC
|
GEN
|
|
advisory
route
|
ADR
|
ATC
|
|
aerial
|
ARL
|
ATC
|
|
aerodrome
|
AD
|
ICAO
|
|
aerodrome
beacon
|
ABN
|
ICAO
|
|
Aerodrome
chart
|
ADC
|
ICAO
|
|
aerodrome
control tower
|
TWR
|
ICAO
|
|
aerodrome
flight information service
|
AFIS
|
ICAO
|
|
aerodrome
forecast
|
TAF
|
ICAO
|