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Which setting is used above the transition altitude?

  • A.The local QNH obtained from the nearest aerodrome, so that the altimeter continues to read true altitude
  • B.QFE
  • C.A setting derived from the temperature of the air at the flight level being maintained by the aircraft
  • D.The standard setting of 1013.25 hectopascals

Answer: D

Above the transition altitude all aircraft set 1013.25 hectopascals and fly on flight levels, so they are separated by pressure rather than by true altitude. Consistency matters more than accuracy for separation. Below the transition level the local QNH is used so that terrain clearance is assured, which is why the changeover exists at all. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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