|
Contraction
|
Definition
|
Usage
|
|
C
|
celsius
|
GEN
|
|
C
|
Central
Standard Time (time groups only)
|
NWS
|
|
C
|
centre
(runway ID)
|
ICAO
|
|
C
|
circling
(approach and landing charts)
|
ATC
|
|
C
|
continental
(air mass)
|
NWS
|
|
C/A
|
Coarse/Acquisition
|
ATC
|
|
CA
|
clear
above (PIREP only)
|
ATC
|
|
CAAS
|
Class A
Airspace
|
ATC
|
|
CAC
|
change to
approach control or changing to approach control
|
ATC
|
|
CAC
|
contact
approach control
|
ATC
|
|
CACT
|
civil air
carrier turbojet
|
GEN
|
|
CADO
|
Chief,
Airport District Office
|
GEN
|
|
CAM
|
Canadian
Armed Forces Transport Command
|
GEN
|
|
CAN
|
Canada
|
NWS
|
|
CANFORCE
|
Canadian
Armed Force
|
GEN
|
|
CANO
|
catalogue
number
|
GEN
|
|
CANOT
|
Canadian
NOTAM
|
GEN
|
|
CANR
|
Canadian
NORAD Region
|
GEN
|
|
CAO
|
change of
appointing office
|
GEN
|
|
CAP
|
Civil Air
Patrol
|
GEN
|
|
CAP/IS
|
combined
approach control/international station
|
GEN
|
|
CAPD
|
climb at
pilot’s discretion
|
ATC
|
|
CAPT
|
captain
|
GEN
|
|
CARA
|
check area
airports
|
GEN
|
|
CARF
|
central
altitude reservation function
|
GEN
|
|
CARIB
|
Caribbean
|
NWS
|
|
CARU
|
Canadian
Airspace Reservation Unit
|
GEN
|
|
CAS
|
calibrated
airspeed
|
ATC
|
|
CAS
|
collision
avoidance system
|
GEN
|
|
CASCDS
|
cascades
|
NWS
|
|
CAT
|
category
|
ICAO
|
|
CAT
|
clear air
turbulence
|
GEN
|
|
CATX
|
climb and
cross
|
ATC
|
|
CAUFN
|
caution
advised until further notice
|
GEN
|
|
CAVOK
|
cloud and
visibility OK
|
NWS
|
|
CAVU
|
clear or
scattered clouds and visibility greater than ten miles
|
NWS
|
|
CAWS
|
common
aviation weather subsystem
|
NWS
|
|
CB
|
cumulonimbus
|
NWS
|
|
CBAS
|
Class B
airspace
|
ATC
|
|
CBMAM
|
cumulonimbus
mamma
|
NWS
|
|
CBSA
|
Class B
surface area
|
ATC
|
|
CC
|
carbon
copy
|
GEN
|
|
CC
|
cirrocumulus
|
NWS
|
|
CCA
|
continental
control area
|
GEN
|
|
CCAS
|
Class C
airspace
|
ATC
|
|
CCC
|
Central
Computer Complex
|
GEN
|
|
CCC
|
Regional
Communications Control Center
|
GEN
|
|
CCD
|
City (or
County) Civil Defense Director at____
|
GEN
|
|
CCFP
|
collaborative
convective forecast product
|
ATC
|
|
CCLDS
|
clear of
clouds
|
ATC
|
|
CCLKOB
|
counterclockwise
orbit
|
ATC
|
|
CCLKWS
|
counterclockwise
|
NWS
|
|
CCRU
|
complete
crew
|
GEN
|
|
CCRZ
|
climb and
cruise
|
ATC
|
|
CCSA
|
Class C
surface area
|
ATC
|
|
CCSL
|
standing
lenticular cirrocumulus
|
NWS
|
|
CCTLR
|
chief
controller
|
GEN
|
|
CCUS
|
cleared
Customs
|
GEN
|
|
CD
|
candela
|
ICAO
|
|
CD
|
civil
defense
|
GEN
|
|
CD
|
clearance
delivery
|
GEN
|
|
CDAS
|
Class D
airspace
|
ATC
|
|
CDC
|
computer
display channel
|
GEN
|
|
CDFNT
|
cold front
|
NWS
|
|
CDM
|
collaborative
decision making
|
ATC
|
|
CDN
|
coordination
|
ICAO
|
|
CDO
|
communications
duty officer
|
GEN
|
|
CDSA
|
Class D
surface area
|
ATC
|
|
CE
|
communications
equipment
|
GEN
|
|
CEAS
|
Class E
airspace
|
ATC
|
|
CELNAV
|
celestial
navigation
|
GEN
|
|
CENGR
|
civil
engineer
|
GEN
|
|
CENPAC
|
Central
North Pacific
|
ATC
|
|
CER
|
climb en
route
|
ATC
|
|
CERAP
|
combined
center/RAPCON
|
GEN
|
|
CERT
|
certificate
|
GEN
|
|
CERTIF
|
certification
|
GEN
|
|
CESA
|
Class E
surface area
|
ATC
|
|
CF
|
change
frequency to
|
ICAO
|
|
CFA
|
controlled
firing area
|
ATC
|
|
CFAD
|
composite
flight data processing
|
GEN
|
|
CFADC
|
Canadian
Forces Air Defense Command
|
GEN
|
|
CFAP
|
cleared
for approach
|
ATC
|
|
CFM
|
confirm
|
GEN
|
|
CFM
|
Confirm or
I confirm
|
ICAO
|
|
CFN
|
confine
|
GEN
|
|
CFP
|
cold front
passage
|
NWS
|
|
CFPL
|
carryover
from previous log
|
ATC
|
|
CFR
|
Code of
Federal Regulations
|
GEN
|
|
CFWSU
|
central
flow weather service unit
|
GEN
|
|
CFY
|
clarify
|
GEN
|
|
CG
|
Coast
Guard
|
GEN
|
|
CGAS
|
Class G
airspace
|
ATC
|
|
CGAS
|
Coast
Guard Air Station
|
GEN
|
|
CGL
|
circling
guidance light
|
ICAO
|
|
CGLS
|
Coast
Guard LORAN Station
|
GEN
|
|
CGSTN
|
congestion
|
GEN
|
|
CH
|
channel
|
ICAO
|
|
CH
|
This is a
channelcontinuitycheck of transmission to permit comparison of your
record of channel sequence numbers of messages received on the channel
|
ICAO
|
|
CHAP
|
chapter
|
GEN
|
|
CHARC
|
characteristic
|
GEN
|
|
CHC
|
chance
|
NWS
|
|
CHG
|
change
|
GEN
|
|
CHGO
|
changing
over
|
ATC
|
|
CHM
|
chemicals
|
GEN
|
|
CHNL
|
channel
|
GEN
|
|
CHOK
|
check okay
|
GEN
|
|
CHOV
|
changeover
|
ATC
|
|
CHRG
|
charge
|
GEN
|
|
CHSPK
|
Chesapeake
|
NWS
|
|
CHTR
|
charter
|
GEN
|
|
CI
|
cirrus
|
NWS
|
|
CIC
|
controller
in charge
|
GEN
|
|
CIDIN
|
common
ICAO data interchange network
|
ICAO
|
|
CIFP
|
cancel IFR
flight plan
|
ATC
|
|
CIFR
|
cancel IFR
clearance previously given
|
ATC
|
|
CIFRR
|
Common IFR
Room
|
GEN
|
|
CIG
|
ceiling
|
NWS
|
|
CINCNORAD
|
Commander
in Chief, North American Aerospace Defense Command
|
GEN
|
|
CIRNAV
|
circumnavigate
|
ATC
|
|
CIRNOT
|
circuit
notice
|
GEN
|
|
CIRVIS
|
communications
instructions for reporting vital intelligence sightings
|
ATC
|
|
CIT
|
near or
over large towns
|
ICAO
|
|
CIV
|
civil
|
ICAO
|
|
CK
|
check
|
ICAO
|
|
CKT
|
circuit
|
GEN
|
|
CL
|
centre
line
|
ICAO
|
|
CL
|
closing station
|
GEN
|
|
CL
|
course
line
|
ATC
|
|
CLA
|
clear type
of ice formation
|
ICAO
|
|
CLB
|
climb
|
ATC
|
|
CLBI
|
climb
immediately
|
ATC
|
|
CLBN
|
crash
locator beacon
|
GEN
|
|
CLBR
|
calibration
|
ICAO
|
|
CLD
|
cloud
|
NWS
|
|
CLG
|
calling
|
ICAO
|
|
CLKOB
|
clockwise
orbit
|
ATC
|
|
CLKWS
|
clockwise
|
GEN
|
|
CLN
|
colon
|
GEN
|
|
CLNC
|
clearance
|
GEN
|
|
CLODA
|
closing
date
|
GEN
|
|
CLOTO
|
close this
office
|
GEN
|
|
CLR
|
clear
|
NWS
|
|
CLRAP
|
cleared as
planned
|
ATC
|
|
CLRS
|
clear and
smooth
|
NWS
|
|
CLSD
|
closed
|
ICAO
|
|
CLST
|
celestial
|
ATC
|
|
CLU
|
circuit
line up
|
GEN
|
|
CM
|
centimeter
|
ICAO
|
|
CMA
|
comma
|
GEN
|
|
CMB
|
climb to
or climbing to
|
ICAO
|
|
CMNC
|
commence
|
GEN
|
|
CMPCT
|
compact
|
GEN
|
|
CMPL
|
complete
or completed or completion
|
ICAO
|
|
CMPLT
|
complete
|
GEN
|
|
CMPLX
|
complex
|
GEN
|
|
CMPSN
|
composition
|
GEN
|
|
CMPT
|
component
|
GEN
|
|
CMS
|
construction
maintenance supervisor
|
GEN
|
|
CMSN
|
commission
|
GEN
|
|
CNCL
|
cancel
|
NWS
|
|
CNCNT
|
concurrently
|
GEN
|
|
CNCT
|
connect
|
GEN
|
|
CNDN
|
Canadian
|
NWS
|
|
CNL
|
cancel
|
GEN
|
|
CNLFP
|
cancel
flight plan
|
ATC
|
|
CNS
|
communications,
navigation and surveillance
|
ICAO
|
|
CNS
|
Consolidated
NOTAM System
|
ATC
|
|
CNSTNT
|
consistent
|
GEN
|
|
CNTR
|
center
|
GEN
|
|
CNTRL
|
central
|
GEN
|
|
CNTRLN
|
centerline
|
GEN
|
|
CNVG
|
converge
|
GEN
|
|
CNVRT
|
convert
|
GEN
|
|
CNVSN
|
conversion
|
GEN
|
|
CNVTV
|
convective
|
NWS
|
|
CO
|
company
|
GEN
|
|
CO
|
county
|
GEN
|
|
COB
|
close of
business
|
GEN
|
|
COC
|
climb on
course
|
ATC
|
|
COLL
|
collect
|
GEN
|
|
COM
|
communication
|
ICAO
|
|
COMB
|
combine
|
GEN
|
|
COML
|
commercial
|
GEN
|
|
COMLO
|
compass
locator
|
GEN
|
|
COMPR
|
compare
|
GEN
|
|
COMPRT
|
compartment
|
GEN
|
|
CONC
|
concrete
|
ICAO
|
|
CONCA
|
continue
calling until
|
ATC
|
|
COND
|
condition
|
GEN
|
|
CONF
|
confidential
|
GEN
|
|
CONFDC
|
confidence
|
NWS
|
|
CONFIG
|
configuration
|
ATC
|
|
CONFIGN
|
configuration
|
GEN
|
|
CONR
|
Continental
NORAD Region
|
GEN
|
|
CONS
|
continuous
|
ICAO
|
|
CONSO
|
CONSOLAN
Facility
|
GEN
|
|
CONSOL
|
consol
beacon
|
GEN
|
|
CONSOLAN
|
low or
medium frequency long range navigational aid
|
GEN
|
|
CONST
|
construction
|
ICAO
|
|
CONT
|
continue(s)
or continued
|
ICAO
|
|
CONTDVD
|
Continental
Divide
|
NWS
|
|
CONTH
|
continue
to hold
|
ATC
|
|
CONTR
|
contract
|
GEN
|
|
CONTRAILS
|
condensation
trails
|
NWS
|
|
COORD
|
coordinate
|
GEN
|
|
COORD
|
Coordinates
|
ICAO
|
|
COP
|
changeover
point
|
GEN
|
|
COPCOM
|
Controllers’
Operations and Procedures Committee
|
GEN
|
|
COPT
|
completed
procedure turn
|
ATC
|
|
COR
|
correct or
corrected or correction
|
GEN
|
|
CORAS
|
corridor
assignment
|
ATC
|
|
COREQ
|
confirming
requisition follows
|
GEN
|
|
COT
|
at the
coast
|
ICAO
|
|
COV
|
cover
|
ICAO
|
|
CP
|
circular
polarization
|
GEN
|
|
CPA
|
crash
phone activated
|
GEN
|
|
CPBL
|
capable
|
GEN
|
|
CPD
|
coupled
|
GEN
|
|
CPDLC
|
Controllerpilot
data link communications
|
ICAO
|
|
CPF
|
complete
power failure
|
GEN
|
|
CPL
|
current
flight plan
|
ICAO
|
|
CPME
|
Calibration
performance monitoring equipment
|
GEN
|
|
CPN
|
air
transport pulse radar navigation aid
|
GEN
|
|
CPS
|
air
transport pulse radar search
|
GEN
|
|
CPTY
|
capacity
|
GEN
|
|
CRAD
|
composite
radar data processing
|
GEN
|
|
CRAF
|
civil
reserve air fleet
|
GEN
|
|
CRC
|
circle
|
GEN
|
|
CRC
|
Cyclic
redundancy check
|
ICAO
|
|
CRCHF
|
crew chief
|
GEN
|
|
CRLC
|
circulate
|
GEN
|
|
CRS
|
course
|
GEN
|
|
CRT
|
cathode
ray tube
|
GEN
|
|
CRTFY
|
certify
|
GEN
|
|
CRYPTO
|
cryptographic
|
GEN
|
|
CRZ
|
cruise
|
ICAO
|
|
CRZAM
|
cruise and
maintain
|
ATC
|
|
CRZWTR
|
cruise
well to right
|
ATC
|
|
CS
|
Call sign
|
ICAO
|
|
CS
|
cirrostratus
|
NWS
|
|
CS/C
|
combined
station/center
|
GEN
|
|
CS/T
|
combined
station/tower
|
GEN
|
|
CSATR
|
climb so
as to reach
|
ATC
|
|
CSATX
|
climb so
as to cross
|
ATC
|
|
CSDR
|
consider
|
GEN
|
|
CSDRBL
|
considerable
|
GEN
|
|
CSLDT
|
consolidate
|
GEN
|
|
CST
|
coast
|
NWS
|
|
CTA
|
control
area
|
ICAO
|
|
CTAF
|
common
traffic advisory frequency
|
ATC
|
|
CTAM
|
climb to
and maintain
|
ATC
|
|
CTAS
|
controlled
airspace
|
ATC
|
|
CTAX
|
climb to
and cross
|
ATC
|
|
CTC
|
contact
|
GEN
|
|
CTCC
|
change to
center control or changing to center control
|
ATC
|
|
CTCC
|
contact
center control
|
ATC
|
|
CTCEN
|
contact
center
|
ATC
|
|
CTGY
|
category
|
NWS
|
|
CTL
|
control
|
ICAO
|
|
CTLA
|
control
area
|
GEN
|
|
CTLB
|
control
boundary
|
GEN
|
|
CTLR
|
controller
|
GEN
|
|
CTLZ
|
control
zone
|
GEN
|
|
CTN
|
caution
|
GEN
|
|
CTR
|
control
zone
|
ICAO
|
|
CTRAC
|
common
terminal radar approach control
|
GEN
|
|
CTSKLS
|
Catskills
|
NWS
|
|
CU
|
cumulus
|
NWS
|
|
CUF
|
cumuliform
|
ICAO
|
|
CUFRA
|
cumulus
fractus
|
NWS
|
|
CUSNO
|
customs
has been notified
|
GEN
|
|
CUST
|
customs
|
ICAO
|
|
CVFP
|
cancel VFR
flight plan
|
ATC
|
|
CVINO
|
clearance
void if not off
|
ATC
|
|
CVN
|
convene
|
GEN
|
|
CVR
|
Cockpit
voice recorder
|
ICAO
|
|
CVR
|
cover
|
GEN
|
|
CVRS
|
computerized
voice reservation system
|
ATC
|
|
CW
|
continuous
wave
|
ICAO
|
|
CWM
|
change
weight manifest
|
GEN
|
|
CWRC
|
climb well
to right of course
|
ATC
|
|
CWSU
|
central
weather service unit
|
GEN
|
|
CWTR
|
climb well
to right
|
ATC
|
|
CWY
|
clearway
|
ICAO
|
|
CXA
|
cancel
approved arrival
|
ATC
|
|
CXD
|
cancel
approved departure
|
ATC
|
|
CYC
|
cyclonic
|
NWS
|
|
CYCLGN
|
cyclogenesis
|
NWS
|
|
CYL
|
cylinder
|
GEN
|
|
CZM
|
coastal
zone management
|
GEN
|
