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In attended mode what causes the APU to shutdown automatically?

April 26, 2017apu attended automatically causes mode shutdown

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In attended mode what causes the APU to shutdown automatically?

1 Answer

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1- APU fire / inlet overtemperature. 2- Overspeed / loss of overspeed protection. 3- APU controller failure. 4- Speed drop ( rpm less than 88% and no acceleration for 10 sec ).