89.What happens when the arming lever is set to the ARMED position ?

　The girt bar stay attached to the cabin floor.

　The girt bar slides towards the telescopic fork.

　The telescopic fork slides towards the girt bar fitting.

正确答案：A

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572.What happens when manual mode is used?

571.What is the number of outflow valves and safety valves?

570.The mixer unit fiap opens if:

569.If a duct overheat is detected?

568.Which sensor may signal pack overheat to the pack controller?

567.Which sensor pneumatically closes the Flow Control Valve in case of pack overheat?

566.If the pack controller fails ,the pack outlet temperature is controlled by:

565.What happens when the RAM AIR pushbutton is set to ON?

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?