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542 - ATPL - When an underspeed fault is detected on an AC generator connected to the aircraft AC busbar, the protection device opens the:

Question 542 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Exciter breaker.
Generator breaker.
Exciter breaker, generator breaker and tie breaker.
Exciter breaker and generator breaker.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license