Glossary of Terms

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Data link flight information services (D-FIS). The provision of FIS via data link.

Damp Runway

A runway is considered damp when the surface is not dry, but when the moisture on it does not
give it a shiny appearance.

Danger Area

“danger area” means an airspace of dimensions specified by the appropriate ATS authority
within which activities dangerous to the flight of aircraft may exist at specified times;

Dangerous goods

“dangerous goods” means articles or substances which are capable of posing a risk
to health, safety, property or the environment and which are shown in the list of
dangerous goods in the Technical Instructions or which are classified according to
those Instructions, when transported by air;

Dangerous goods accident.

Dangerous goods accident. An occurrence associated with and related to the transport of dangerous goods by air which results
in fatal or serious injury to a person or major property or environmental damage.

Dangerous goods incident. An occurrence, other than a dangerous goods accident, associated with and related to the transport
of dangerous goods by air, not necessarily occurring on board an aircraft, which results in injury to a person, property or
environmental damage, fire, breakage, spillage, leakage of fluid or radiation or other evidence that the integrity of the
packaging has not been maintained. Any occurrence relating to the transport of dangerous goods which seriously
jeopardizes the aircraft or its occupants is also deemed to constitute a dangerous goods incident.


Datum. Any quantity or set of quantities that may serve as a reference or basis for the calculation of other quantities
(ISO 19104*).


DCPC - Direct Controller/Pilot Communications


Dispatch Deviation Procedures Guide (DDPG). Manual to identify any procedure to dispatch an aircraft
with allowable systems/components inoperative or missing.

De-icing/anti-icing facility

De-icing/anti-icing facility. A facility where frost, ice or snow is removed (de-icing) from the aeroplane to provide clean
surfaces, and/or where clean surfaces of the aeroplane receive protection (anti-icing) against the formation of frost or ice
and accumulation of snow or slush for a limited period of time.

Note.— Further guidance is given in the Manual of Aircraft Ground De-icing/Anti-icing Operations (Doc 9640).

De-icing/anti-icing pad. An area comprising an inner area for the parking of an aeroplane to receive de-icing/anti-icing
treatment and an outer area for the manoeuvring of two or more mobile de-icing/anti-icing equipment.

Decision Altitude

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

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”.

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