PPRuNe Forums - View Single Post - 787 Batteries and Chargers - Part 1
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Old 8th Mar 2013, 20:59
  #881 (permalink)  
Chris Scott
 
Join Date: Jan 2008
Location: Blighty (Nth. Downs)
Age: 73
Posts: 2,076
Hi mm43,
"The APU once online should be self sufficient, and not beholden to the state of APU battery"

If the APU and/or its 2 gennies (starter/generators) fail, perhaps catastrophically, there must remain a power supply to control the APU shutdown, and trigger the fire bottle(s) if necessary. The APU may have a FADEC generating its own power during normal running, but the APU also needs some kind of battery back-up, IMO. (Must admit I'm "winging" this one!)
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