ACCELERATE STOP DISTANCE AVAILABLE (ASDA)
The take-off run available plus the length of stopway available
(if stopway is provided).
AERODROME BEACON (ABN)
A light, visible intermittently at all azimuths, used to indicate the location of an
aerodrome from the air.
AERODROME CONTROL SERVICE
ATC service for aerodrome traffic.
AERODROME CONTROL TOWER
A unit established to provide ATC service to aerodrome traffic.
AERODROME ELEVATION
The elevation of the highest point of the landing area.
AERODROME METEOROLOGICAL MINIMA (Ceiling and Visibility Minima)
The minimum heights of cloud base (ceiling) and minimum values of visibility which
are prescribed in pursuance of CAR 257 for the purpose of determining the usability
of an aerodrome either for take-off or landing.
AERODROME REFERENCE POINT (ARP)
The designated geographical location of an aerodrome.
AERODROME TRAFFIC
All traffic on the manoeuvring area of an aerodrome and all aircraft flying in the
vicinity of an aerodrome.
Note: An aircraft is in the vicinity of an aerodrome when it is, in, entering, or leaving
the traffic circuit.
AERONAUTICAL INFORMATION CIRCULAR (AIC)
A notice containing information that does not qualify for the origination of a
NOTAM, or for inclusion in the AIP, but which relates to flight safety, air navigation,
technical, administrative, or legislative matters.
AERONAUTICAL INFORMATION PUBLICATION (AIP)
A publication issued by or with the authority of a State and containing aeronautical
information of a lasting character essential to air navigation.
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DEFINITIONS
AIRCRAFT WEIGHT CATEGORIES
For the purposes of wake turbulence separation aircraft are divided into the
following weight categories:
• HEAVY (H) - All aircraft of 136,000KG maximum take-off or more;
• MEDIUM (M) - Aircraft of less than 136,000KG maximum take-off
weight but more than 7,000KG maximum take-off weight.
• LIGHT (L) - Aircraft of 7,000KG maximum take-off weight or less.
AIR-GROUND COMMUNICATIONS (A/G)
Two-way communications between aircraft and stations on the surface of the earth.
AIR-REPORT (AIREP)
A report prepared by the pilot during the course of a flight in conformity with the
requirements for position, operational or meteorological reporting in the AIREP
form.
AIR TRAFFIC CONTROL CLEARANCE
Authorisation for aircraft to proceed under conditions specified by an Air Traffic
control unit.
NOTE 1: For convenience, the term “Air Traffic Control Clearance”
is frequently abbreviated to “Clearance” when used in appropriate context.
NOTE 2: The abbreviated term “Clearance” may be prefixed by “Taxi”,“Take-Off”,
“Departure”, “En-route”, Approach”,
or “Landing” to indicate the particular portion of the flight
to which the Air Traffic control Clearance relates.
AIR TRAFFIC CONTROL INSTRUCTIONS
Directions given by a person performing duty in Air Traffic control for an aircraft to
conduct its flight in the manner specified in the directions.
AIR TRANSIT
Means the airborne movement of a helicopter that is:
• For the expeditious transit from one place within an aerodrome
to another place within the aerodrome.
• At or below 100FT above the surface, and
• At speeds greater than those used in air taxiing.
AIR TRAFFIC CONTROL SERVICES
Means any service provided by Air Traffic Control when performing a function
referred to in Air Service Regulation 3.02 and includes a traffic advisory service,
traffic avoidance advice and traffic information.
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DEFINITIONS
AIR TRAFFIC SERVICES (ATS)
ATC service, flight information service and SAR alerting service.
AIRWAYS CLEARANCE
A clearance, issued by ATC, to operate in controlled airspace along a designated
track or route at a specified level to a specified point or flight planned destination.
ALERTING SERVICE
A service provided to notify an appropriate organisation regarding aircraft in need of
search and rescue air, and to assist such organisation as required.
ALL-OVER FIELD
A defined landing area selected or prepared for the landing and take-off of aircraft
in various directions.
ALTIMETER SETTING
A pressure datum which when set on the sub-scale of a sensitive altimeter causes
the altimeter to indicate vertical displacement from that datum.
A pressure-type altimeter calibrated in accordance with Standard Atmosphere may
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