CAP 413 Radiotelephony Manual
Chapter 1 Page 6
AIC Aeronautical Information Circular
AIP Aeronautical Information Publication
AIRPROX* Aircraft Proximity (replaces Airmiss/APHAZ)
AIS Aeronautical Information Services
amsl Above Mean Sea Level
ANO Air Navigation Order
APAPI Abbreviated Precision Approach Path Indicator (pronounced Ay-PAPI)
ATA Actual Time of Arrival
ATC Air Traffic Control (in general)
ATCO* Air Traffic Control Officer (M)
ATD Actual Time of Departure
ATIS* Automatic Terminal Information Service
ATS Air Traffic Service
ATSU Air Traffic Service Unit
ATSOCAS Air Traffic Services outside Controlled Airspace
AT-VASIS Abbreviated T Visual Approach Slope Indicator System (pronounced Ay-
Tee-VASIS)
ATZ Aerodrome Traffic Zone
C
CAA Civil Aviation Authority
CAVOK* Visibility, cloud and present weather better than prescribed values or
conditions (CAVOK pronounced Cav-okay)
C/S Callsign
CDO Clearance Delivery Officer
CMATZ Combined Military Aerodrome Traffic Zone
CPDLC Controller Pilot Data Link Communication (pronounced See Pee Dee Ell
See) - A means of communication between a controller and aircrew using
data link in conjuction with or instead of voice, for ATC.
CTA Control Area
CTR Control Zone
D
DAAIS* Danger Area Activity Information Service (DAAIS pronounced DAY-ES)
DACS* Danger Area Crossing Service
DF Direction Finding
31 March 2011
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