|
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
|
GEN
|
|
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
|