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transition altitude

EASA defines “transition altitude” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

‘transition altitude’ means the altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes;

Article 2 · Standardised European Rules of the Air (SERA) · Regulation (EU) No 923/2012 · Easy Access Rules, 26 Aug 2025 revision · Read Article 2

Also in the aviation glossary

Transition Altitude (QNH) FAA IPH
The altitude in the vicinity of an airport at or below which the vertical position of an aircraft is controlled by reference to altitudes (MSL).

Defined in the same article

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