Type training · Boeing 757-300 differences · ATA 21

Boeing 757-300 Differences: Air Conditioning (ATA 21)Type training questions & answers

The four-zone temperature control with the new MID cabin zone, trim air valves, the zone controller and recirculation.

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Sample Air Conditioning questions with answers

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

  1. 1.How many temperature zones does the zone temperature control system control on the 757-300?

    • A.Four
    • B.Three
    • C.Five
    Show answer and explanation

    Correct answer: A. Four

    Flight deck, FWD, MID and AFT cabin. The 757-200 has three zones (flight deck, FWD and AFT), so the MID cabin zone is new on the longer airplane.

  2. 2.Which cabin zone does the 757-300 have that the 757-200 does not?

    • A.MID cabin
    • B.Crew rest
    • C.Forward galley
    Show answer and explanation

    Correct answer: A. MID cabin

    The -200 cabin is split into FWD and AFT zones. The -300 adds a MID zone with its own selector, sensors, duct overheat switch and trim air modulating valve.

  3. 3.How many trim air modulating valves (TAMVs) are on the 757-300?

    • A.Four
    • B.Three
    • C.Two
    Show answer and explanation

    Correct answer: A. Four

    One TAMV per zone: flight deck, FWD, MID and AFT. The 757-200 has three.

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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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