The Auxiliary Power Unit (APU) has its own AC generator that:

Question

ATPL - Airline Transport Pilot license - Aircraft General Knowledge - Airframe, Systems, Powerplant - The Auxiliary Power Unit (APU) has its own AC generator that:

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Supplies the aircraft with three-phase 115-200 V, 400 Hz A

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Is Driven At Constant Speed Through A Constant Speed Drive (csd), In The Same Way As The Main Ac Generator.

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Is excited by its Generator Control Unit (GCU) as soon as the APU starts up.

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Must Have The Same Characteristics As The Main Ac Generator So That It Can Be Easily Coupled With The Latter.

ATPL: The Auxiliary Power Unit (APU) has its own AC generator that:

Question 518, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license