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parking or maintenance.
Apron Service: A traffic regulatory and information service provided to
aircraft using the apron area of an aerodrome.
Apron Taxiway: A portion of a taxiway system located on an apron and
intended to provide a through taxi route across the apron.
Area Control Service: Air traffic control service for controlled flights in control
areas.
Area Navigation (RNAV): A method of navigation which permits aircraft
operation on any desired flight path within the coverage of station-referenced
navigation aids, or within the limits of the capability of self-contained aids, or a
combination of these.
Area Navigation (RNAV) Route: An ATS route established for the use of
aircraft capable of employing area navigation.
Area QNH: A forecast altimeter setting which is representative of the QNH of
any location within a particular area.
ATS Route: A specified route designed for channelling the flow of traffic as
necessary for the provision of air traffic services.
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
Automatic Dependent Surveillance (ADS): A surveillance technique in
which aircraft automatically provide, via datalink, data derived from on-board
navigation and position fixing systems, including aircraft identification,
four-dimensional position, and additional data as appropriate.
Automatic En Route Information Service (AERIS): The provision of
operational information en route 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.
Aviation Reference Number (ARN): A unique six-digit number used to
identify a client who conducts business with CASA. When CASA receives an
application for a new licence, certificate, or other service, an ARN is
established and all subsequent transactions for the client are recorded against
that ARN. In addition to being a client number, the ARN may also be the
licence or certificate number. The ARN should be quoted in all
correspondence with CASA or with Airservices Publications Unit.
Base Turn (Instrument Approach): A turn executed by the aircraft during the
initial approach between the end of the outbound track and the beginning of
the intermediate or final approach track. The tracks are not reciprocal.
Note: Base turns may be designated as being made either in level flight or
while descending, according to the circumstances of each individual
procedure.
Blind Transmission: A transmission from one station to another station in
circumstances where two-way communication cannot be established, but
where it is believed that the called station is able to receive the transmission.
Block Level: A section of airspace with specified upper and lower limits on a
specific track, in which cleared aircraft are permitted to manoeuvre.
Break-out Procedure: A procedure initiated on instruction from a Precision
Runway Monitor (PRM) controller upon which a pilot is required to discontinue
an ILS approach and immediately commence a turn of approximately 90° from
the ILS course, climbing (or descending) as instructed by ATC, in response to
an aircraft deviating from the adjacent ILS course.
Briefing: The act of giving in advance, specific pre-flight instructions or
information to aircrew.
Broadcast: A transmission of information relating to air navigation that is not
addressed to a specific station or stations.
GEN TOC ENR TOC AD TOC Index
GEN (GENERAL) A/L 45 effective 24 NOV 05
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.
CENSAR: An automated centralised SARTIME database software package
used by ATS to manage SARTIMEs.
Centre: A generic call-sign 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.
Circling Approach: An extension of an instrument approach procedure
which provides for visual circling of the aerodrome prior to landing.
Clearance Limit: The point to which an aircraft is granted an air traffic control
clearance.
Clearance Expiry Time: A time specified by an air traffic control unit at which
a clearance ceases to be valid.
Clearway: A defined rectangular area on the ground or water under the
control of the appropriate authority, selected or prepared as a suitable area
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