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Thread: LNAV/VNAV BAROVNAV APPROACH
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Old 29th March 2018 | 19:56
  #13 (permalink)  
eckhard
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Joined: May 2005
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You’re welcome!

Just to add: the QNH uses the ISA model temperature lapse rate with height, as that is also used by the mechanism in the altimeter, whereas the QFF uses the actual ambient conditions to derive the sea-level pressure.
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