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applied to the digital expression of data that provides a
level of assurance against loss or alteration of data.
Data link communications. A form of communication intended
for the exchange of messages via a data link.
Data 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.
on an ATS route segment defined by reference to very
Declared capacity. A measure of the ability of the ATC system
high frequency omnidirectional radio ranges is expected
or any of its subsystems or operating positions to provide
to transfer its primary navigational reference from the
facility behind the aircraft to the next facility ahead of the service to aircraft during normal activities. It is expressed as
aircraft. the number of aircraft entering a specified portion of
airspace in a given period of time, taking due account of
weather, ATC ;nit configuration, staff andequipment avail-
Note.- Change-over points are established to provide the able, and any other factors that may affect the workload of
optimum balance in respect of signal strength and qualiry the controller responsible for the airspace.
between facilities at all levels to be used and to ensure a
common source of azimuth guidance for all aircraft operating DETRESFA. m e code word used to designate a distress
along the same portion of a route segment. phase.
Clearance limit. The point to which an aircraft is granted an
air traffic control clearance.
Conference communications. Communication facilities whereby
direct speech conversation may be conducted between three
or more locations simultaneously.
Control area. A controlled airspace extending upwards from a
specified limit above the earth.
Controlled aerodrome. An aerodrome at which air traffic
control service is provided to aerodrome traffic.
Note.- The term "controlled aerodrome" indicates that
air traftic control service is provided to aerodrome traftic but
does not necessarily imply that a control zone exists.
Distress phase. A situation wherein there is reasonable certainty
that an aircraft and its occupants are threatened by grave
and imminent danger or require immediate assistance.
Downstream clearance. A clearance issued to an aircraft by an
air traffic control unit that is not the current controlling
authority of that aircraft.
Emergency phase. A generic term meaning, as the case may
be, uncertainty phase, alert phase or distress phase.
Final approach That part of an instrument approach procedure
which commences at the specified final approach fix or
point, or where such a fix or point is not specified,
a) at the end of the last procedure turn, base turn or
inbound turn of a racetrack procedure, if specified; or
Controlled airspace. An airspace of defined dimensions within b) at the point of interception of the last track specified in
which air traffic control service is provided in accordance the approach procedure; and
with the airspace classification.
ends at a point in the vicinity of an aerodrome from which:
Note.- Controlled airspace is a generic term which covers
ATS airspace Classes A, B, C, D and E as described in 2.6. 1) a landing can be made; or
Controlled flight. Any flight which is subject to an air traffic
control clearance.
Controller-pilot data link communications (CPDLC). A means
of communication between controller and pilot, using data
link for ATC communications.
Control zone. A controlled airspace extending upwards from
the surface of the earth to a specified upper limit.
Cruising level. A level maintained during a significant portion
of a flight.
2) a missed approach procedure is initiated.
Flight crew member. A licensed crew member charged with
duties essential to the operation of an aircraft during a flight
duty period.
Flight information centre. A unit established to provide flight
information service and alerting service.
Flight information region. An airspace of defined dimensions
within which flight information service and alerting service
are provided.
Chapter I Annex 11 - Air Traffic Services
Flight i~zformations ervice. A service provided for the purpose IMC. The symbol used to designate instrtrment meteorological
uf giving advice and infurmatior~ useful fur the safc and conditions.
efficient conduct of flights.
INCERFA. The code word used to designate an uncertainty
Flight level. A surface of constant atmospheric pressure which phase.
is related to a specific pressure datum, 1 013.2 hectopascals
(hPa), and is separated from other such surfaces by specific Incident. An occurrence, other than an accident, associated
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