When can the door be opened ?

A. Wing tank outer cell ,

B. Center tank ,

C. Wing tank inner cell .

A. The mixer unit flap closes

B. The PRV and the TAVs closes

C. The PRV and the corresponding TAV close

A. To add oxygen to the expired gas.

B. To trap the carbon dioxyde contained in the expired gas.

C. To allow the expired gas to flow out of the hood.

A. To enable the received audio signals to be selected.

B. To enable the received audio signals and the frequencies to be selected.

C. To enable the frequencies of all the radio communication systems to be selected.

A. The First Officer＇s ND and PFD are not in normal configuration.

B. The Captain cannot display the ND on either display unit.

C. The Captain＇s PFD Display Unit is inoperative.

A. Yes.

B. No.

A. Line Select Keys may be used to transfer data onto the scratchpad.

B. Modifiable data must first be entered onto the scratchpad before being transferred, by using the appropriate Line Select Key.

C. Line Select Keys may be used to delete data from the adjacent data field, without using the CLR key.

A. Manually though the MCDU only .

B. Manually though the MCDU and automatically though the DMU.

C. Fully automatically though the DMU.

A. The fuel booster pumps pressure decreases.

B. The Engine is shut down or the ENG FIRE pushbutton is released out.

C. The Engine fire detection system senses an engine fire.

A. In closed position.

B. In open fail safe position.

C. Either in closed or open position, depending on the last operating conditions.