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Note.— Controlled airspace is a generic term which covers
ATS airspace Classes A, B, C, D and E as described in
Annex 11, 2.6.
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.
Cruise climb. An aeroplane cruising technique resulting in a
net increase in altitude as the aeroplane mass decreases.
Cruising level. A level maintained during a significant portion
of a flight.
Current flight plan. The flight plan, including changes, if any,
brought about by subsequent clearances.
Danger area. An airspace of defined dimensions within which
activities dangerous to the flight of aircraft may exist at
specified times.
Data link communications. A form of communication
intended for the exchange of messages via a data link.
Estimated off-block time. The estimated time at which the
aircraft will commence movement associated with
departure.
Estimated time of arrival. For IFR flights, the time at which
it is estimated that the aircraft will arrive over that
designated point, defined by reference to navigation aids,
from which it is intended that an instrument approach
procedure will be commenced, or, if no navigation aid is
associated with the aerodrome, the time at which the
aircraft will arrive over the aerodrome. For VFR flights, the
time at which it is estimated that the aircraft will arrive
over the aerodrome.
Expected approach time. The time at which ATC expects that
an arriving aircraft, following a delay, will leave the
holding point to complete its approach for a landing.
Note.— The actual time of leaving the holding point will
depend upon the approach clearance.
Filed flight plan. The flight plan as filed with an ATS unit by
the pilot or a designated representative, without any
subsequent changes.
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Annex 2 — Rules of the Air Chapter 1
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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.
Flight information service. A service provided for the purpose
of giving advice and information useful for the safe and
efficient conduct of flights.
Flight level. A surface of constant atmospheric pressure which
is related to a specific pressure datum, 1 013.2 hectopascals
(hPa), and is separated from other such surfaces by specific
pressure intervals.
Note 1.— A pressure type altimeter calibrated in
accordance with the Standard Atmosphere:
a) when set to a QNH altimeter setting, will indicate
altitude;
b) when set to a QFE altimeter setting, will indicate height
above the QFE reference datum;
c) when set to a pressure of 1 013.2 hPa, may be used to
indicate flight levels.
Note 2.— The terms “height” and “altitude”, used in
Note 1 above, indicate altimetric rather than geometric
heights and altitudes.
Flight plan. Specified information provided to air traffic
services units, relative to an intended flight or portion of a
flight of an aircraft.
Flight status. An indication of whether a given aircraft
requires special handling by air traffic services units or not.
Flight visibility. The visibility forward from the cockpit of an
aircraft in flight.
Ground visibility. The visibility at an aerodrome, as reported
by an accredited observer.
Heading. The direction in which the longitudinal axis of an
aircraft is pointed, usually expressed in degrees from North
(true, magnetic, compass or grid).
Height. The vertical distance of a level, a point or an object
considered as a point, measured from a specified datum.
IFR. The symbol used to designate the instrument flight rules.
IFR flight. A flight conducted in accordance with the
instrument flight rules.
IMC. The symbol used to designate instrument meteorological
conditions.
Instrument approach procedure. A series of predetermined
manoeuvres by reference to flight instruments with
specified protection from obstacles from the initial
approach fix, or where applicable, from the beginning of a
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