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Old 12th Dec 2010, 19:00
  #6 (permalink)  
TURIN
 
Join Date: Feb 2002
Location: UK
Age: 58
Posts: 3,525
Received 208 Likes on 116 Posts
I'm curious.

What sound does a battery make?

If you mean the sound in the cockpit with the battery on, but all other electric sources off. IE ground power, APU or engine gens, then I understand.
However, with all other electric sources off you wont get any Air Con or recirc fan etc, only essential DC bus and emergency AC bus. (I think. Not a sparky so don't sue me).
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