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Old 4th Jun 2012, 15:38
  #33 (permalink)  
ReverseFlight
 
Join Date: Nov 2007
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Is GPS Primary selected by the crew or the FMS?
Not by the crew. If the aircraft has GPS primary, the FMS will confirm it has GPS primary if specific RNP tolerances are maintained. If all GPS receivers fail, the RNP tolerances can still be satisfied by IRS ONLY navigation for a specified number of hours.
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