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Old 1st January 2017 | 06:30
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extricate
 
Joined: Apr 2008
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From: Test
Auto APU Start - B777
Hi there,

FCOM states: "In flight, if both AC transfer busses lose power, the APU automatically starts, regardless of APU selector position. The APU can be shut down by positioning the selector to ON, then OFF."

Why APU starts automatically when AC tsx busses lose power?

Thanks for your time
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