transition altitude


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transition altitude

[tran′zish·ən ′al·tə‚tüd]
(aerospace engineering)
The altitude in the vicinity of an aerodrome at or below which the vertical position of an aircraft is controlled by reference to true altitude.

transition altitude

The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes (ICAO). The height above the aerodrome of the transition altitude is as low as possible but normally not less than 3000 ft (900 m). The calculated height of the transition altitude is rounded up to the next full 1000 ft (300 m). The transition altitude is always indicated on instrument approach charts. It is the altitude when altimeter settings are changed from QNH to QNE (i.e., 1013.2 hectopascals/29.92 in of mercury) when climbing and from QNE to QNH or QFE when descending. See also QFE, QNE and QNH.
References in periodicals archive ?
The approved change is intended to harmonise the Transition Altitude level of 6,000 feet for both Worthing and Clacton CTAs and align both areas with adjacent controlled airspace.
Maiquetia's transition altitude is 12,000 feet for climbing and the transition level must be called out by ATC when descending.