|
Definition
|
Contraction
|
Usage
|
|
calibration
|
CLBR
|
ICAO
|
|
calibration
performance monitoring equipment
|
CPME
|
ATC
|
|
Call
sign
|
CS
|
ICAO
|
|
Calling
|
CLG
|
ICAO
|
|
Canada
|
CAN
|
NWS
|
|
Canadian
|
CNDN
|
NWS
|
|
Canadian
Airspace Reservation Unit
|
CARU
|
GEN
|
|
Canadian
Armed Force
|
CANFORCE
|
GEN
|
|
Canadian
Armed Forces Transport Command
|
CAM
|
GEN
|
|
Canadian
Forces Air Defense Command
|
CFADC
|
GEN
|
|
Canadian
NORAD Region
|
CANR
|
GEN
|
|
Canadian
NOTAM
|
CANOT
|
GEN
|
|
cancel
|
CNCL
|
NWS
|
|
cancel
|
CNL
|
GEN
|
|
cancel
approved arrival
|
CXA
|
ATC
|
|
cancel
approved departure
|
CXD
|
ATC
|
|
cancel
flight plan
|
CNLFP
|
ATC
|
|
cancel
IFR clearance previously given
|
CIFR
|
ATC
|
|
cancel
IFR flight plan
|
CIFP
|
ATC
|
|
cancel
VFR flight plan
|
CVFP
|
ATC
|
|
candela
|
CD
|
ICAO
|
|
capable
|
CPBL
|
GEN
|
|
capacity
|
CPTY
|
GEN
|
|
captain
|
CAPT
|
GEN
|
|
carbon
copy
|
CC
|
GEN
|
|
Caribbean
|
CARIB
|
NWS
|
|
carryover
from previous log
|
CFPL
|
ATC
|
|
cascades
|
CASCDS
|
NWS
|
|
catalogue
number
|
CANO
|
GEN
|
|
category
|
CAT
|
ICAO
|
|
category
|
CTGY
|
NWS
|
|
cathode
ray tube
|
CRT
|
GEN
|
|
Catskills
|
CTSKLS
|
NWS
|
|
caution
|
CTN
|
GEN
|
|
caution
advised until further notice
|
CAUFN
|
GEN
|
|
ceiling
|
CIG
|
NWS
|
|
celestial
|
CLST
|
ATC
|
|
celestial
navigation
|
CELNAV
|
GEN
|
|
celsius
|
C
|
GEN
|
|
center
|
CNTR
|
GEN
|
|
center
clearance delivered
|
B
|
ATC
|
|
centerline
|
CNTRLN
|
GEN
|
|
centimeter
|
CM
|
ICAO
|
|
central
|
CNTRL
|
GEN
|
|
central
altitude reservation function
|
CARF
|
GEN
|
|
Central
Computer Complex
|
CCC
|
GEN
|
|
central
flow weather service unit
|
CFWSU
|
GEN
|
|
Central
North Pacific
|
CENPAC
|
ATC
|
|
Central
Region, FAA
|
ACE
|
GEN
|
|
Central
Standard Time (time groups only)
|
C
|
NWS
|
|
central
weather service unit
|
CWSU
|
GEN
|
|
centre (runway
ID)
|
C
|
ICAO
|
|
centre line
|
CL
|
ICAO
|
|
certificate
|
CERT
|
GEN
|
|
certification
|
CERTIF
|
GEN
|
|
certify
|
CRTFY
|
GEN
|
|
chance
|
CHC
|
NWS
|
|
change
|
CHG
|
GEN
|
|
change
frequency to
|
CF
|
ICAO
|
|
change
of appointing office
|
CAO
|
GEN
|
|
change
to approach control or changing to approach control
|
CAC
|
ATC
|
|
change
to center control or changing to center control
|
CTCC
|
ATC
|
|
change
weight manifest
|
CWM
|
GEN
|
|
changeover
|
CHOV
|
ATC
|
|
changeover
point
|
COP
|
GEN
|
|
changing
over
|
CHGO
|
ATC
|
|
channel
|
CH
|
ICAO
|
|
channel
|
CHNL
|
GEN
|
|
chapter
|
CHAP
|
GEN
|
|
characteristic
|
CHARC
|
GEN
|
|
charge
|
CHRG
|
GEN
|
|
charter
|
CHTR
|
GEN
|
|
check
|
CK
|
ICAO
|
|
check
area airports
|
CARA
|
GEN
|
|
check
okay
|
CHOK
|
GEN
|
|
chemicals
|
CHM
|
GEN
|
|
Chesapeake
|
CHSPK
|
NWS
|
|
chief
controller
|
CCTLR
|
GEN
|
|
Chief,
Airport District Office
|
CADO
|
GEN
|
|
circle
|
CRC
|
GEN
|
|
circling
(approach and landing charts)
|
C
|
ATC
|
|
circling
guidance light
|
CGL
|
ICAO
|
|
circuit
|
CKT
|
GEN
|
|
circuit
line up
|
CLU
|
GEN
|
|
circuit
notice
|
CIRNOT
|
GEN
|
|
circular
polarization
|
CP
|
GEN
|
|
circulate
|
CRLC
|
GEN
|
|
circumnavigate
|
CIRNAV
|
ATC
|
|
cirrocumulus
|
CC
|
NWS
|
|
cirrostratus
|
CS
|
NWS
|
|
cirrus
|
CI
|
NWS
|
|
City
(or County) Civil Defense Director at____
|
CCD
|
GEN
|
|
civil
|
CIV
|
ICAO
|
|
civil
air carrier turbojet
|
CACT
|
GEN
|
|
Civil
Air Patrol
|
CAP
|
GEN
|
|
civil
defense
|
CD
|
GEN
|
|
civil
engineer
|
CENGR
|
GEN
|
|
civil
reserve air fleet
|
CRAF
|
GEN
|
|
clarify
|
CFY
|
GEN
|
|
Class
A Airspace
|
CAAS
|
ATC
|
|
Class
B airspace
|
CBAS
|
ATC
|
|
Class
B surface area
|
CBSA
|
ATC
|
|
Class
C airspace
|
CCAS
|
ATC
|
|
Class
C surface area
|
CCSA
|
ATC
|
|
Class
D airspace
|
CDAS
|
ATC
|
|
Class
D surface area
|
CDSA
|
ATC
|
|
Class
E airspace
|
CEAS
|
ATC
|
|
Class
E surface area
|
CESA
|
ATC
|
|
Class
G airspace
|
CGAS
|
ATC
|
|
clear
|
CLR
|
NWS
|
|
clear
above (PIREP only)
|
CA
|
ATC
|
|
clear
air turbulence
|
CAT
|
GEN
|
|
clear
and smooth
|
CLRS
|
NWS
|
|
clear
of clouds
|
CCLDS
|
ATC
|
|
clear
or scattered clouds and visibility greater than ten miles
|
CAVU
|
NWS
|
|
clear
or scattered clouds and visibility greater than ten, remainder of
report missing (weather reports only)
|
DCAVU
|
NWS
|
|
clear
type of ice formation
|
CLA
|
ICAO
|
|
clearance
|
CLNC
|
GEN
|
|
clearance
delivery
|
CD
|
GEN
|
|
clearance
void if not off
|
CVINO
|
ATC
|
|
cleared
as planned
|
CLRAP
|
ATC
|
|
cleared
Customs
|
CCUS
|
GEN
|
|
cleared
for approach
|
CFAP
|
ATC
|
|
cleared
to fix
|
F
|
ATC
|
|
clearway
|
CWY
|
ICAO
|
|
climb
|
CLB
|
ATC
|
|
climb
and cross
|
CATX
|
ATC
|
|
climb
and cruise
|
CCRZ
|
ATC
|
|
climb
at pilot’s discretion
|
CAPD
|
ATC
|
|
climb
en route
|
CER
|
ATC
|
|
climb
immediately
|
CLBI
|
ATC
|
|
climb
on course
|
COC
|
ATC
|
|
climb
so as to cross
|
CSATX
|
ATC
|
|
climb
so as to reach
|
CSATR
|
ATC
|
|
climb
to and cross
|
CTAX
|
ATC
|
|
climb
to and maintain
|
CTAM
|
ATC
|
|
climb
to or climbing to
|
CMB
|
ICAO
|
|
climb
well to right
|
CWTR
|
ATC
|
|
climb
well to right of course
|
CWRC
|
ATC
|
|
clockwise
|
CLKWS
|
GEN
|
|
clockwise
orbit
|
CLKOB
|
ATC
|
|
close
of business
|
COB
|
GEN
|
|
close
this office
|
CLOTO
|
GEN
|
|
closed
|
CLSD
|
ICAO
|
|
closing
date
|
CLODA
|
GEN
|
|
closing
station
|
CL
|
GEN
|
|
cloud
|
CLD
|
NWS
|
|
cloud
and visibility OK
|
CAVOK
|
NWS
|
|
cloud
base
|
BASE
|
GEN
|
|
cloud
top
|
TOP
|
NWS
|
|
Coarse/Acquisition
|
C/A
|
ATC
|
|
coast
|
CST
|
NWS
|
|
Coast
Guard
|
CG
|
GEN
|
|
Coast
Guard Air Station
|
CGAS
|
GEN
|
|
Coast
Guard LORAN Station
|
CGLS
|
GEN
|
|
coastal
zone management
|
CZM
|
GEN
|
|
Cockpit
voice recorder
|
CVR
|
ICAO
|
|
Code
of Federal Regulations
|
CFR
|
GEN
|
|
cold
(air mass)
|
K
|
NWS
|
|
cold
front
|
CDFNT
|
NWS
|
|
cold
front passage
|
CFP
|
NWS
|
|
collaborative
convective forecast product
|
CCFP
|
ATC
|
|
collaborative
decision making
|
CDM
|
ATC
|
|
collect
|
COLL
|
GEN
|
|
collision
avoidance system
|
CAS
|
GEN
|
|
colon
|
CLN
|
GEN
|
|
combine
|
COMB
|
GEN
|
|
combined
approach control/international station
|
CAP/IS
|
GEN
|
|
combined
center/RAPCON
|
CERAP
|
GEN
|
|
combined
station/center
|
CS/C
|
GEN
|
|
combined
station/tower
|
CS/T
|
GEN
|
|
comma
|
CMA
|
GEN
|
|
Commander
in Chief, North American Aerospace Defense Command
|
CINCNORAD
|
GEN
|
|
commence
|
CMNC
|
GEN
|
|
commercial
|
COML
|
GEN
|
|
commercial
broadcasting station
|
BS
|
ICAO
|
|
commission
|
CMSN
|
GEN
|
|
common
aviation weather subsystem
|
CAWS
|
NWS
|
|
common
ICAO data interchange network
|
CIDIN
|
ICAO
|
|
Common
IFR Room
|
CIFRR
|
GEN
|
|
common
terminal radar approach control
|
CTRAC
|
GEN
|
|
common
traffic advisory frequency
|
CTAF
|
ATC
|
|
communication
|
COM
|
ICAO
|
|
communications
duty officer
|
CDO
|
GEN
|
|
communications
equipment
|
CE
|
GEN
|
|
communications
instructions for reporting vital intelligence sightings
|
CIRVIS
|
ATC
|
|
communications,
navigation and surveillance
|
CNS
|
ICAO
|
|
compact
|
CMPCT
|
GEN
|
|
company
|
CO
|
GEN
|
|
compare
|
COMPR
|
GEN
|
|
compartment
|
COMPRT
|
GEN
|
|
compass
locator
|
COMLO
|
GEN
|
|
compass
locator at ILS middle marker
|
LMM
|
GEN
|
|
compass
locator at ILS outer marker
|
LOM
|
GEN
|
|
complete
|
CMPLT
|
GEN
|
|
complete
crew
|
CCRU
|
GEN
|
|
complete
or completed or completion
|
CMPL
|
ICAO
|
|
complete
power failure
|
CPF
|
GEN
|
|
completed
procedure turn
|
COPT
|
ATC
|
|
complex
|
CMPLX
|
GEN
|
|
component
|
CMPT
|
GEN
|
|
composite
flight data processing
|
CFAD
|
GEN
|
|
composite
radar data processing
|
CRAD
|
GEN
|
|
composition
|
CMPSN
|
GEN
|
|
computer
display channel
|
CDC
|
GEN
|
|
computerized
voice reservation system
|
CVRS
|
ATC
|
|
concrete
|
CONC
|
ICAO
|
|
concurrently
|
CNCNT
|
GEN
|
|
condensation
trails
|
CONTRAILS
|
NWS
|
|
condition
|
COND
|
GEN
|
|
confidence
|
CONFDC
|
NWS
|
|
confidential
|
CONF
|
GEN
|
|
configuration
|
CONFIGN
|
GEN
|
|
configuration
|
CONFIG
|
ATC
|
|
confine
|
CFN
|
GEN
|
|
confirm
|
CFM
|
GEN
|
|
Confirm
or I confirm
|
CFM
|
ICAO
|
|
confirming
requisition follows
|
COREQ
|
GEN
|
|
congestion
|
CGSTN
|
GEN
|
|
connect
|
CNCT
|
GEN
|
|
consider
|
CSDR
|
GEN
|
|
considerable
|
CSDRBL
|
GEN
|
|
consistent
|
CNSTNT
|
GEN
|
|
consol beacon
|
CONSOL
|
GEN
|
|
CONSOLAN
Facility
|
CONSO
|
GEN
|
|
consolidate
|
CSLDT
|
GEN
|
|
Consolidated
NOTAM System
|
CNS
|
ATC
|
|
construction
|
CONST
|
ICAO
|
|
construction
maintenance supervisor
|
CMS
|
GEN
|
|
contact
|
CTC
|
GEN
|
|
contact
approach control
|
CAC
|
ATC
|
|
contact
center
|
CTCEN
|
ATC
|
|
contact
center control
|
CTCC
|
ATC
|
|
continental
(air mass)
|
C
|
NWS
|
|
continental
control area
|
CCA
|
GEN
|
|
Continental
Divide
|
CONTDVD
|
NWS
|
|
Continental
NORAD Region
|
CONR
|
GEN
|
|
continue
calling until
|
CONCA
|
ATC
|
|
continue(s)
or continued
|
CONT
|
ICAO
|
|
continue
to hold
|
CONTH
|
ATC
|
|
continuous
|
CONS
|
ICAO
|
|
continuous
24hour service
|
H24
|
ICAO
|
|
continuous
wave
|
CW
|
ICAO
|
|
contract
|
CONTR
|
GEN
|
|
control
|
CTL
|
ICAO
|
|
control
area
|
CTA
|
ICAO
|
|
control
area
|
CTLA
|
GEN
|
|
control
boundary
|
CTLB
|
GEN
|
|
control
zone
|
CTLZ
|
GEN
|
|
control
zone
|
CTR
|
ICAO
|
|
controlled
airspace
|
CTAS
|
ATC
|
|
controlled
firing area
|
CFA
|
ATC
|
|
controller
|
CTLR
|
GEN
|
|
controller
in charge
|
CIC
|
GEN
|
|
Controllerpilot data link
communications
|
CPDLC
|
ICAO
|
|
Controllers’
Operations and Procedures Committee
|
COPCOM
|
GEN
|
|
convective
|
CNVTV
|
NWS
|
|
convene
|
CVN
|
GEN
|
|
converge
|
CNVG
|
GEN
|
|
conversion
|
CNVSN
|
GEN
|
|
convert
|
CNVRT
|
GEN
|
|
coordinate
|
COORD
|
GEN
|
|
Coordinated
Universal Time
|
UTC
|
GEN
|
|
Coordinated
Universal Time Coordinate Check Completed
|
UTCOK
|
GEN
|
|
Coordinates
|
COORD
|
ICAO
|
|
coordination
|
CDN
|
ICAO
|
|
correct
or corrected or correction
|
COR
|
GEN
|
|
corridor
assignment
|
CORAS
|
ATC
|
|
counterclockwise
|
CCLKWS
|
NWS
|
|
counterclockwise
orbit
|
CCLKOB
|
ATC
|
|
county
|
CO
|
GEN
|
|
coupled
|
CPD
|
GEN
|
|
course
|
CRS
|
GEN
|
|
course
line
|
CL
|
ATC
|
|
cover
|
COV
|
ICAO
|
|
cover
|
CVR
|
GEN
|
|
crash
locator beacon
|
CLBN
|
GEN
|
|
crash
phone activated
|
CPA
|
GEN
|
|
crew
chief
|
CRCHF
|
GEN
|
|
cross
|
X
|
ICAO
|
|
cross
talk
|
XTLK
|
ATC
|
|
crossbar
|
XBAR
|
ICAO
|
|
crossing
|
XNG
|
ICAO
|
|
crosswind
|
XW
|
ATC
|
|
cruise
|
CRZ
|
ICAO
|
|
cruise
and maintain
|
CRZAM
|
ATC
|
|
cruise
well to right
|
CRZWTR
|
ATC
|
|
Cryptographic
|
CRYPTO
|
GEN
|
|
Crystal
|
XTAL
|
GEN
|
|
Cumuliform
|
CUF
|
ICAO
|
|
Cumulonimbus
|
CB
|
NWS
|
|
cumulonimbus
mamma
|
CBMAM
|
NWS
|
|
Cumulus
|
CU
|
NWS
|
|
cumulus
fractus
|
CUFRA
|
NWS
|
|
current
flight plan
|
CPL
|
ICAO
|
|
Customs
|
CUST
|
ICAO
|
|
customs
has been notified
|
CUSNO
|
GEN
|
|
Cyclic
redundancy check
|
CRC
|
ICAO
|
|
Cyclogenesis
|
CYCLGN
|
NWS
|
|
Cyclonic
|
CYC
|
NWS
|
|
Cylinder
|
CYL
|
GEN
|