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Old 4th Feb 2009, 09:40
  #9 (permalink)  
chestnut charlie
 
Join Date: Sep 2007
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744 can use APU in the air.APU to packs takeoff is available, APU is able to supply air to one pack up to 15,000ft. APU operates to 20,000ft but unable to supply any electrical power in flight.
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