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6 – i ndex
ClearanceExpiryTime:
A time specifiedby anair traffic control unit
atwhich a clearance ceases tobevalid.
Clearway:
Adefined rectangular areaon thegroundorwater under the
control of the appropriate authority, selectedor preparedas a suitable
areaoverwhichan aeroplanemaymakeaportionof its initial climb to
a specifiedheight.
Collocated (Navigation) Aids:
En routeway-points or navigation
aids that arewithin 600mof eachother.
CommonTrafficAdvisoryFrequency (CTAF):
Adesignated
frequencyonwhichpilotsmakepositional broadcastswhenoperating
in the vicinityof anon-towered aerodrome.
CommunicableDiseases:
Communicablediseases include cholera,
typhus (epidemic), smallpox, yellow fever, plague, and suchother
diseases as the contractingStates shall, from time to time, decide to
designate.
CompanyOperationsRepresentative:
The representativeof an
operating agencywho is authorised to act in the capacityof liaison
officer betweenATC and theoperatingagency in respect of the control
of anaircraft of that agency.
ControlArea (CTA):
A controlled airspace extendingupwards from a
specified limit above the earth.
ControlledAerodrome:
An aerodromeatwhichair traffic control
service is provided to aerodrome traffic.
ControlledAirspace:
Airspaceof defineddimensionswithinwhich
air traffic control service is provided inaccordancewith the airspace
classification.
Controller:
An air traffic controller, operatingwithin anorganisation
approvedunder CASRPart 172 andqualified inaccordancewithCASR
Part 65.
ControllerPilotDataLinkCommunications (CPDLC):
Ameans
of communicationbetween controller andpilot usingdata link for ATC
communications.
ControlZone (CTR):
A controlled airspaceextendingupwards from
the surfaceof the earth to a specifiedupper limit.
definitions