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6 – i ndex
AirTrafficControlService:
A serviceprovided for thepurposeof:
• preventing collisions:
- between aircraft; and
- on themanoeuvring areabetween aircraft andobstructions; and
• expediting andmaintaining anorderlyflowof air traffic.
AirTrafficService (ATS):
Ageneric termmeaningvariously, flight
information service, alerting service, air traffic advisory service, air
traffic control service (area control service, approach control service,
or aerodrome control service).
AirTransit:
The airbornemovement of ahelicopter that is:
• for the expeditious transit fromoneplacewithin anaerodrome to
another placewithin the aerodrome;
• at or below100 ft above the surface; and
• at speeds greater than thoseused inair taxiing.
AirwaysClearance:
A clearance, issuedbyATC, tooperate in
controlled airspacealong adesignated track or route at a specified
level toa specifiedpoint or flight planneddestination.
AlertedSee-and-Avoid:
Aprocedurewhereflight crew, havingbeen
alerted to the existence and approximate locationof other traffic in
their immediatevicinity, seek to sight andavoid collidingwith those
known aircraft.
AlertingPost:
An agencydesignated to serveas an intermediary
between aperson reporting an aircraft indistress anda rescue
coordination centre.
AlertingService:
A serviceprovided tonotify appropriate
organisations regarding aircraft inneedof searchand rescueaid, and
toassist suchorganisations as required.
AlternateAerodrome:
An aerodrome towhichanaircraftmay
proceedwhen it becomes either impossibleor inadvisable toproceed
toor to land at the aerodromeof intended landing.
AltimeterSetting:
Apressuredatumwhichwhen set on the sub-
scaleof a sensitive altimeter causes thealtimeter to indicatevertical
displacement from that datum. Apressure-type altimeter calibrated
inaccordancewithStandardAtmospheremaybeused to indicate
altitude, height or flight levels, as follows:
definitions