97.What is the purpose of the spring loaded blocking piston in the manual selector valve ?

　To prevent door opening if pressure is

　To lock the selector in the OPEN/CLOSE position until the actuator is fully opened/retracted.

　To ensure correct pressure in the extension chamber of the actuators before closing.

正确答案：C

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564.What flow is delivered by the pack with the PACK FLOW selector on LO and bleed air supplied by the APU?

563.What is the purpose of the RAM AIR flaps?

562.What is purpose of the bypass valve?

561.What is the function of the trim air valve?

560.How is the basic temperature regulated by the ACSC?

559.What is the function of each ACSC ?

558.What is the purpose of the pack?

557.Zero Fuel Weight is entered :

556.Pressing the ALIGN IRS Line Select Key on INIT page A:

555.If no company route exists in the data base for your flight, what must be done INIT page A?