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6 – i ndex
CAT
ClearAir Turbulence
+CAVOK
Visibility, cloud and present
weather better than prescribed
values of conditions
#CB
Cumulonimbus
CC
Cirrocumulus
CCTS
Circuits
CEN
EnRouteandAreaATCUnit
CET
ClearanceExpiryTime
CF
ChangeFrequencyTo
CFM
Confirm, I Confirm
CH
Channel
CHTR
Charter
CI
Cirrus
CIT
Near, Over LargeTown(s)
CIV
Civil
CK
Check
C/L
Centre Line
CLA
Clear type of ice formation
CLBR
Calibration
CLD
Cloud
CLG
Calling
CLIAS
Climbing IndicatedAirspeed
CLR
Clear, Cleared to..., Clearance
CLSD
Closed, Close, Closing
CM
Centimetre
CMB
Climb to or Climbing to
CMPL
Completion, Completed, or
Complete
CMSD
Commissioned
CNL
Cancel, Calcelled
CNL
Flight Plan cancellation
message
CNS
Communications, Navigation
andSurveillance
COM
Communications
CONC
Concrete
COND
Condition
CONS
Continuous
CONST
Construction, Constructed
CONT
Continue(s), Continued
COOR
Coordinate, Coordinated
COORD
Coordinates
COP
Change-over Point
COR
Correct, Corrected, Correction
COS
Conical Surface
COT
At theCoast, Coastal
COV
Cover, Covered, Covering
#CPDLC
Controller Pilot Datalink
Communication
CRC CyclicRedundancyCheck
CRZ
Cruise
CS
Cirrostratus
CS
Call-sign
abbreviations and acronyms
CODE DEFINITION
CODE DEFINITION