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461 - ATPL - On detection of a persistent phase unbalance on an AC generator connected to the aircraft mains, with another AC generator, the protection device opens:

Question 461 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

The tie breaker.
The exciter control relay and the generator breaker.
The generator breaker.
The generator breaker and the tie breaker.

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