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Thread: FAA Grounds 787s
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Old 22nd January 2013 | 11:27
  #300 (permalink)  
cod liver oil
 
Joined: Jun 2005
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From: position data invalid
The APU is required for the ETOPS certification, which by definition has to be very reliable and therefore needs a very reliable battery.
Power source for B787 APU starting may be airplane battery, a ground power source, or an engine-driven generator.

Wouldn't engine-driven generator be used as primary power source for APU in-flight lightup?
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