AN2 - Definitions
Airspace Structure and Air Navigation Services
Airspace Structure and Air Navigation Services
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Cartes-fiches
Level
A generic term relating to the vertical position of an aircraft in flight and meaning variously height, altitude or flight level.
Height
The vertical distance of a level, a point or an object considered as a point, measured from a specified datum.
Altitude
The vertical distance of a level, a point or an object considered as a point, measured from mean sea level.
Elevation
The vertical distance of a point or a level, on or affixed to the surface of the earth, measured from mean sea level.
Flight Level
A surface of constant atmospheric pressure which is related to a specified pressure datum, 1013,2 hP, and is separated from other such surfaces by specific pressure intervals.
Transition Altitude
The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes.
Transition Level
The lowest flight level available for use above the transition altitude.
Transition Layer
The airspace between then transision altitude and the transition level.
ATC Clearence
Authorisation for an aircraft to proceed under conditions specified by an air traffic control unit.
Clearance Limit
The point to which an aircraft is granted an air traffic control clearance.
ATC Instructions
Directives issued by air traffic control for the purpose of requiring a pilot to take a specific action.
Holding Fix
A geographical location, identified by visual or other means that serves as a reference for a holding procedure.
Holding Procedure
A predetermined manoeuvre which keeps an aircraft within a specified airspace whilst awaiting further clearance.
Separation
Spacing between aircraft, levels or tracks.
