56.What happens when the flush switch is pressed at high altitude ?

　As the differential pressure between the cabin and the atmosphere is sufficient, the vacuum generator does not operate.

　As the differential pressure between the cabin and the atmosphere is not sufficient, the vacuum generator does not operate.

　As the differential pressure between the cabin and the atmosphere is sufficient, the vacuum generator operates.

正确答案：A

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605.How is a ground mechanic to flight crew call indicated in the cockpit?

604.Which action must be performed to talk through the flight interphone system?

603.How is a SELCAL call indicated in the cockpit?

602.How is the SELCAL CALL light reset?

601.When is the muting circuit operative?

600.Are the audio signals processed inside the ACPs?

599.What happens when CAPT 3 position is selected?

598.What is the function of the RESET key?

597.Is it possible to transmit simultaneously on Passenger Address and VHF channels?

596.What is displayed in case of a SELCAL call on VHF 2?