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

　When there is no command signal to the servo-valve.

　Only when the solenoid valve is de-energized.

　When the solenoid valve is de-energized or the actuator is not pressurized.

正确答案：C

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282.With the MAIN OFF pushbutton previously pressed, how can you switch on the WINDOWS lighting at FULL BRIGHTNESS ?

281.Which lighting includes flourescent lamps and integral ballast units ?

280.In electrical emergency configuration, which cockpit lights remain on ?

279.What is the rotating mechanism used for ?

278.What signal is delivered by the pressure transducer ?

277.Where is the tire pressure indication displayed ?

276.What are the adjustable diaphragms used for ?

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

274.What is the purp[ose of the accumulator ?

273.Is nose wheel steering available after a landing gear gravity extension ?