PPRuNe Forums - View Single Post - B747-400: BAT switch with APU running
Thread: B747-400: BAT switch with APU running
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Old 25th Sep 2016, 18:23
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Crispy Pig
 
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If I recall correctly, the battery bus supplies power to the APU fire protection system. In the scenario you describe the APU goes into an auto shutdown without a cooling cycle as a safety precaution - this is the case on the 757 anyway!
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