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Thread: APU failure and evacuation for AA731 A330-300 at LHR
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Old Jun 26, 2016 | 2:32 pm
  #6  
alphaeagle
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Originally Posted by JDiver
For emergency in air power they use the RAT.
They only use the RAT if there are no other power sources, if all engine generators and the APU are non-functioning. They'll turn on the APU inflight as needed, including in non-emergency situations. Depends on the aircraft though, not all aircraft can use the APU inflight.
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