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be used to indicate altitude, height or flight levels, as follows:
• When set to QNH or Area QNH it will indicate altitude;
• When set to Standard Pressure (1013.2 HPA ) it may be used to
indicate flight levels.
ALTITUDE (ALT)
The vertical distance of a level, a point or an object, considered as a point,
measured from mean sea level.
NOTE: In aeronautical terms, altitude is measured in feet. For flight planning, the
letter”A” followed by 3 figures denotes specific altitude, eg A060 for 6000FT
AMSL.
APPROACH CONTROL SERVICE
ATC service for arriving or departing flights.
APPROACH SEQUENCE
The order in which two or more aircraft are cleared to approach to land at the
aerodrome.
APRON
A defined area on a land aerodrome, intended to accommodate aircraft for
purposes of loading or unloading passengers or cargo, fuelling, parking or
maintenance.
APRON SERVICE
A traffic regulatory and information service provided to aircraft using the apron area
of an aerodrome.
345
Civil Aviation Safety Authority Australia
INDEX
09/2001
5 SECTION
DEFINITIONS
AREA CONTROL CENTRE (ACC)
A unit established to provide area control service.
AREA CONTROL SERVICE
ATC service in control areas.
AREA QNH
A forecast altimeter setting which is representative of the QNH of any location
within a particular area.
AUTOMATIC ENROUTE INFORMATION SERVICE (AERIS)
The provision of operational information enroute by means of continuous and
repetitive broadcasts.
AUTOMATIC TERMINAL INFORMATION SERVICE (ATIS)
The provision of current, routine information to arriving and departing aircraft by
means of continuous and repetitive broadcasts during the hours when the unit
responsible for the service is in operation.
BLOCK LEVEL
A section of airspace with specified upper and lower limits on a specified track.
BRIEFING
The act of giving in advance, specific pre-flight instructions or information to
aircrew.
CEILING
The height above the ground or water of the base of the lowest layer of cloud
below 20,000FT covering more than one-half of the sky.
CENTRE
A generic callsign used in the en route and area environment which can include Air
Traffic Control (procedural or radar), Advisory, Flight Information and Alerting
services, depending on the classification of airspace in which the service is provided.
CLEARANCE LIMIT
The point specified in an air traffic control clearance to which an aircraft
is authorised to proceed.
CLEARANCE EXPIRY TIME
The time, if specified, in an air traffic control clearance at which the authorisation
granted therein is withdrawn.
CLEARWAY
A defined rectangular area on the ground or water at the end of a runway in the
direction of take-off and under the control of the Competent Authority, selected or
prepared as a suitable area over which an aircraft may make a portion of its initial
climb to a specified height.
346
Civil Aviation Safety Authority Australia
INDEX
09/2001
5 SECTION
DEFINITIONS
COMMON TRAFFIC ADVISORY FREQUENCY (CTAF)
A frequency for pilots to exchange traffic information while operating to or from an
aerodrome without an operating control tower or within a designated area. Where
established, a CTAF will be shown in ERSA FAC.
CONTROLLED AIRSPACE
Airspace of defined dimensions within which air traffic control services are provided
to IFR flights and to VFR flights in accordance with the airspace classification
CONTROL AREA (CTA)
A controlled airspace extending upwards from a specified limit above the earth.
CONTROL ZONE (CTR)
A controlled airspace extending upwards from the surface of the earth to a specified
upper limit.
CROSSWIND SHEAR
A wind shear occurrence which requires a rapid change in aircraft heading to
maintain track.
CRUISE/CLIMB
An aeroplane cruising technique resulting in a net increase in altitude as the
aeroplane weight decreases.
CRUISING LEVEL
A level maintained during a significant portion of a flight.
NOTE: The word “level”, except in the expression “flight level” is used
to designate the vertical position of an aircraft regardless of the reference
datum or the units of vertical distance used.
In air-ground communications a level will be expressed in terms of “altitude”
or “flight level”, depending on the reference datum and the altimeter
setting in use.
DAY
That period of time from the beginning of morning civil twilight to the end of
evening civil twilight.
DEAD RECKONING (DR) NAVIGATION
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