275.What is the purpose of the by-pass valve ?

　To interconnect the two chambers of the steering actuator.

　To apply hydraulic pressure to the servovalve.

　To bypass the servovalve in case of BSCU failure.

正确答案：A

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386.What happens when the sum of roll and speed brake commands exceeds the maximum possible deflection of a spoiler ?

385.Which EFCS computers control and monitor the yaw damper servo actuators?

384.What happens if a double FAC failure occurs ?

383.What causes the rudder servo actuator to go to damping mode ?

382.Which modes exist for a rudder servo control actuator ?

381.How can a spoiler be raised on ground ?

380.Following a hydraulic system failure in flight what does each spoiler do ?

379.When is the aileron servo-control actuator in damping mode ?

378.Which signals cause rudder pedal movements?

377.How many hydraulic systems power the rudder ?