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Which quantity is QNH in aviation practice?

  • A.The station pressure
  • B.The setting that makes the altimeter read zero when the aircraft is on the ground at the airfield concerned
  • C.The altimeter setting that makes the instrument read airfield elevation on the ground
  • D.The standard pressure setting of 1013.25 hectopascals used by all aircraft above the transition altitude

Answer: C

QNH is the sea level pressure setting, so an altimeter set to it reads the elevation of the airfield when the aircraft is on the ground. QFE makes the instrument read zero on the ground and QNE is the standard setting used in the flight levels. Knowing which is which matters because confusing them has caused accidents.

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