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Ceiling. The height above the ground or water of the base of
the lowest layer of cloud below 6 000 m (20 000 ft)
covering more than half the sky.
Clearance limit. The point to which an aircraft is granted an
air traffic control clearance.
Code (SSR). The number assigned to a particular multiple
pulse reply signal transmitted by a transponder in Mode A
or Mode C.
Computer. A device which performs sequences of arithmetical
and logical steps upon data without human intervention.
Note.— When the word “computer” is used in this
document it may denote a computer complex, which
includes one or more computers and peripheral
equipment.
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 traffic control service is provided to aerodrome
traffic but does not necessarily imply that a control zone
exists.
Controlled airspace. An airspace of defined dimensions within
which air traffic control service is provided in accordance
with the airspace classification.
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 data authority. The designated ground system
through which a CPDLC dialogue between a pilot and a
controller currently responsible for the flight is permitted
to take place.
Current flight plan (CPL). The flight plan, including changes,
if any, brought about by subsequent clearances.
Note.— When the word “message” is used as a suffix
to this term, it denotes the content and format of the
current flight plan data sent from one unit to another.
Data convention. An agreed set of rules governing the manner
or sequence in which a set of data may be combined into
a meaningful communication.
Data link initiation capability (DLIC). A data link application
that provides the ability to exchange addresses, names and
version numbers necessary to initiate data link applications.
1-6 Air Traffic Management (PANS-ATM)
1/11/01
Data processing. A systematic sequence of operations
performed on data.
Note.— Examples of operations are the merging,
sorting, computing or any other transformation or
rearrangement with the object of extracting or revising
information, or of altering the representation of
information.
Decision altitude (DA) or decision height (DH). A specified
altitude or height in the precision approach or approach
with vertical guidance at which a missed approach must be
initiated if the required visual reference to continue the
approach has not been established.
Note 1.— Decision altitude (DA) is referenced to mean
sea level and decision height (DH) is referenced to the
threshold elevation.
Note 2.— The required visual reference means that
section of the visual aids or of the approach area which
should have been in view for sufficient time for the pilot to
have made an assessment of the aircraft position and rate
of change of position, in relation to the desired flight path.
In Category III operations with a decision height the
required visual reference is that specified for the
particular procedure and operation.
Note 3.— For convenience where both expressions are
used they may be written in the form “decision altitude/
height” and abbreviated “DA/H”.
Dependent parallel approaches. Simultaneous approaches to
parallel or near-parallel instrument runways where radar
separation minima between aircraft on adjacent extended
runway centre lines are prescribed.
DETRESFA. The code word used to designate a distress
phase.
Discrete code. A four-digit SSR Code with the last two digits
not being “00”.
Distress phase. A situation wherein there is reasonable
certainty that an aircraft and its occupants are threatened
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