Practice question

According to ICAO Doc 4444 (PANS-ATM), how is 'Transition Altitude' defined?

  1. The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes (QNH)
  2. The lowest flight level available for use above the transition layer
  3. The height above the aerodrome elevation at which altimeter setting must be changed from QFE to QNH
  4. The altitude specified by ATC below which high-speed vectoring is prohibited

Answer: A — The altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes (QNH)

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