Type training · Boeing 757 B2 · ATA 22, 27

Boeing 757 B2: Yaw Damper, Stabilizer Trim and Flight Control Electronics (ATA 22, 27)Type training questions & answers

Yaw damper modules and servos, automatic and mach/speed trim, the SAM, autopilot servos and hydraulic flight control interfaces.

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Sample Yaw Damper, Stabilizer Trim and Flight Control Electronics questions with answers

Three questions from the free preview. Think of your answer first, then open the explanation.

  1. 1.What does the yaw damper system prevent?

    • A.Adverse aileron yaw
    • B.Dutch roll and gust sideslip
    • C.Rudder flutter at high speed
    Show answer and explanation

    Correct answer: B. Dutch roll and gust sideslip

    It uses yaw rate and lateral acceleration to command the rudder through two yaw damper servos in series with the other inputs.

  2. 2.What rudder authority does each yaw damper channel have?

    • A.±1°, or ±2° with both
    • B.±6°, or ±12° with both
    • C.±3°, or ±6° with both
    Show answer and explanation

    Correct answer: C. ±3°, or ±6° with both

    Each servo has ±0.75 in stroke at up to 1 in/s, and a centering spring returns it to neutral with no command.

  3. 3.Which inputs do the yaw damper modules use?

    • A.FCC and FMC steering commands
    • B.ADC, IRU and accelerometers
    • C.Rudder pedal position transducers
    Show answer and explanation

    Correct answer: B. ADC, IRU and accelerometers

    Airspeed comes from the ADCs, yaw rate from the IRUs, and the modal suppression accelerometers are under the aft galley floor.

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Part of the Boeing 757 B2 type course

One chapter of the Boeing 757 B2 type course question bank, for the 757-200 avionics, written in our own words for revision. Your type course and the aircraft maintenance manual stay the authority: limits and procedures can differ between airframes and operators.

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