PPRuNe Forums - View Single Post - Airspeed and altitude : why not GPS as a backup to pitots ?
Old 3rd Aug 2014, 18:26
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Winnerhofer
 
Join Date: Oct 2013
Location: Wengen
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B788

The Boeing 787, from a Pilot's Perspective - View from the Wing - View from the Wing
If you lose all 3 pitot/static systems or air data computers, the airplane reverts to AOA speed (converts AOA to IAS), and this is displayed on the normal PFDs airspeed indicator tapes.
GPS altitude is substituted for air data altitude and displayed on the PFD altimeter tapes. Very convenient.
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