Type training · Boeing 757-300 differences · ATA 22

Boeing 757-300 Differences: Yaw Damper and Stabilizer Trim (ATA 22)Type training questions & answers

The YSMs that replace the -200 yaw damper and stabilizer trim modules, modal suppression, speed trim and YSM BITE.

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Sample Yaw Damper and Stabilizer Trim questions with answers

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

  1. 1.On the 757-300, which units do the yaw damper and stabilizer trim functions?

    • A.Two YDMs and two SAMs
    • B.Three FCCs and the MCDP
    • C.Two YSMs in the CSEUs
    Show answer and explanation

    Correct answer: C. Two YSMs in the CSEUs

    The yaw damper/stabilizer trim modules (YSMs) are CSEU modules that combine both jobs. The 757-200 uses separate yaw damper modules (YDMs) and stabilizer trim/elevator asymmetry modules (SAMs).

  2. 2.Where are the 757-300 left and right YSMs?

    • A.E3-1 and E4-1 shelves
    • B.P11 and P61 panels
    • C.Fin rear spar access
    Show answer and explanation

    Correct answer: A. E3-1 and E4-1 shelves

    The YSMs sit with the other CSEU modules on the E3-1 and E4-1 shelves in the main equipment center. Their circuit breakers are on P11.

  3. 3.Where does the 757-300 YSM get its air data and inertial data from?

    • A.The ADIRUs (L, C, R)
    • B.Separate ADCs and IRUs
    • C.The FMCs and FCCs only
    Show answer and explanation

    Correct answer: A. The ADIRUs (L, C, R)

    The ADIRUs send air data and inertial data on separate buses. The left ADIRU is the primary air data source for the left YSM and the secondary for the right, and the other way round.

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Part of the Boeing 757-200 to -300 differences course

One chapter of the Boeing 757-200 to -300 differences course question bank, for the 757-300, for engineers rated on the 757-200, 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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