Flight RulesAltimetry
Transition Altitude
The transition altitude is the altitude at or below which the vertical position of an aircraft is referenced to the local or area QNH. Above this altitude, vertical position is referenced to standard pressure (1013.2 hPa). Cruising within the transition layer — between the transition altitude and the transition level — is not permitted.
Key Points
- •In the Australian Flight Information Region (FIR), the transition altitude is 10,000 ft.
- •Below the transition altitude, altimeters are set to local or area QNH.
- •Above the transition altitude, altimeters are set to standard pressure (1013.2 hPa).
- •Cruising within the transition layer, between the transition altitude and transition level, is not permitted.
Exam Relevance
Vital for ensuring correct altimeter subscale settings, avoiding airspace busts, and maintaining vertical separation from other aircraft.
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