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

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

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

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

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

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