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position and additional data as appropriate.
Automatic tenninal infontadion service (ATZS). The automatic
provision of current, routine information to arriving
and departing aircraft throughout 24 hours or a specified
portion thereof:
Data link-automatic terminal information service (D-ATIS).
The provision of ATIS via data link.
Voice-automatic terminal information service (Voice-ATIS).
The provision of ATIS by means of continuous and
repetitive voice broadcasts.
Base turn. A turn executed by the aircraft during the initial
approach between the end of the outbound track and the
241 1/05
No. 43
Annex I1 - Air Tram Services Chapter I
beginning of the intermediate or final approach track. The Cruising level. A level maintained during a significant portion
tracks are not reciprocal. of a flight.
Note.- Base turns may be designated as being made either Cyclic redundancy check (CRC). A mathematical algorithm
in level flight or while descending, according to the circum- applied to the digital expression of data that provides a
stances of each individual procedure. level of assurance against loss or alteration of data.
Calendar. Discrete temporal reference system that provides Data link communications. A of communication intended
the basis for defining temporal position to a resolution of for the exchange of messages via a data link.
one day (IS0 19108*).
Change-over point. The point at which an aircraft navigating
on an ATS route segment defined by reference to very
high frequency omnidirectional radio ranges is expected
to transfer its primary navigational reference from the
facility behind the aircraft to the next facility ahead of the
aircraft.
Note.- Change-over points are established to provide the
optimum balance in respect of signal strength and quality
between facilities at all levels to be used and to ensure a
common source of azimuth guidance for all aircraft operating
along the same portion of a route segment.
Clearance limif. The point to which an aircraft is granted an
air traffic control clearance.
Conference communications. Communication facilities whereby
D& quality. A degree or level of confidence that the data
provided meets the requirements of the data user in terms
of accuracy, resolution and integrity.
Datum. Any quantity or set of quantities that may serve as a
reference or basis for the calculation of other quantities
(IS0 19104*).
Declared capacity. A measure of the ability of the ATC system
or any of its subsystems or operating positions to provide
service to aircraft during normal activities. It is expressed as
the number of aircraft entering a specified portion of airspace
in a given period of time, taking due account of
weather. ATC unit configuration, staff and equipment available,
and any other factors that may affect the workload of
the controller responsible for the airspace.
direct speech conversation may be conducted between three
or more locations simultaneously. DETRESFA. The code word used to designate a distress
phase.
Control area. A controlled airspace extending upwards from a
specified limit above the earth. Distress phase. A situation wherein there is reasonable certainty
that an aircraft and its occupants are threatened by grave
Controlled aerodrome. An aerodrome at which air traffic and imminent danger or require immediate assistance.
control service is provided to aerodrome traffic.
Downstream cleamnce. A clearance issued to an aircraft by an
Note.- The term "controlled aerodrome" indicates that air traffic control unit that is not the current controlling
air traffic control service is provided to aerodrome trafic but authority of that aircraft.
does not necessarily imply that a control zone exists.
Emergency phase. A generic term meaning, as the case may
Controlled airspace. An airspace of defined dimensions within be, uncertainty phase, alert phase or distress phase.
which air traffic control service is provided in accordance
with the airspace classification.
Final approuch. That part of an instrument approach procedure
Note.- Controlled airspace is a generic term which covers which commences at the specified final approach fix or
ATS airspace Classes A, B, C, D and E as described in 2.6. point, or where such a fix or point is not specified,
Controlledfight. Any flight which is subject to an air traffic a) at the end of the last procedure turn, base turn or
control clearance. inbound turn of a racetrack procedure, if specified; or
Controller-pilot data link communications (CPDLC). A means b) at the point of interception of the last track specified in
of communication between controller and pilot, using data the approach procedure; and
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