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IFR knowledge

4.70 Altimetry

1. Aerodrome QNH
  • Is MSL pressure at the aerodrome 
  • With QNH set the altimeter will indicate altitude
  • ATC / Flight Service will advise the aerodrome QNH
2. Area QNH
  • Area QNH applies within a QNH Zone,
  • outside Control Zones and clear of an aerodrome
  • The 12 area QNH zones are published in AIPNZ ENR1.7
  • QNH for the zone is obtained from ATC, Flight Service or
  • Flight Information.