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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 by grave and imminent danger or require immediate assistance.
D-value. The amount (positive or negative) by which the altitude (Z) of a point on an isobaric surface differs from the altitude (Zp) of the same isobaric surface in the ICAO Standard Atmosphere (i.e. D-value = Z . Zp).
Elevation. The vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level.
Emergency phase. A generic term meaning, as the case may be, uncertainty phase, alert phase or distress phase.
Estimated elapsed time. The estimated time required to proceed from one significant point to another.
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.
Note.— When the word “message” is used as a suffix to this term, it denotes the content and format of the filed flight plan data as transmitted.
Final approach. That part of an instrument approach pro-cedure 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
b)  at the point of interception of the last track specified in the approach procedure; and
ends at a point in the vicinity of an aerodrome from which:
1)  a landing can be made; or
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 flight time.
Flight information centre. A unit established to provide flight information service and alerting service.
No. 2

I.  Definitions
Flight information region. An airspace of defined dimensions within which flight information service and alerting service are provided.
　
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