Flight Rulesaltimetry

Transition Layer

The transition layer is the airspace located between the transition altitude (10,000 ft AMSL in Australia) and the transition level (normally FL110). Cruising within the transition layer is strictly prohibited to ensure a safe vertical buffer between aircraft flying on local QNH and those flying on the standard pressure setting.

Key Points

  • •Located directly between the transition altitude and the transition level.
  • •Cruising flight is not permitted within this layer.
  • •Altimeter settings are changed from QNH to <strong>1013.2 hPa</strong> during climb; on descent, the change from 1013.2 hPa back to QNH must be made before entering the transition layer.

Exam Relevance

Crucial for altimetry and airspace questions, as it dictates where altimeters must be reset during climbs and descents.

Related Terms

transition altitudetransition levelflight level

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Transition Layer | The Pilot Exam