Type training · Boeing 777 B1.1 · ATA 21

Boeing 777 B1.1: Air Conditioning and Pressurization (ATA 21)Type training questions & answers

Packs and flow control, recirculation, equipment cooling, zone temperature and cabin pressure.

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Sample Air Conditioning and Pressurization questions with answers

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

  1. 1.When does the duct pressure in the EICAS ECS data block show amber?

    • A.Below 11 psi
    • B.Below 9.42 psi
    • C.Below 8.95 psi
    Show answer and explanation

    Correct answer: A. Below 11 psi

    Duct pressure shows amber when it is less than 11 psi. Ref AMM 21-30-00.

  2. 2.At what cabin altitude does the CABIN ALTITUDE warning show?

    • A.Always at 14,200 ft cabin altitude
    • B.It depends on landing altitude
    • C.Always at 10,000 ft cabin altitude
    Show answer and explanation

    Correct answer: B. It depends on landing altitude

    The warning limit is related to the selected landing altitude, so it is higher for high-altitude airports. Ref AMM 21-30-00.

  3. 3.In automatic mode, which ASCPC positions the 777 outflow valves?

    • A.Whichever powers up first
    • B.The left ASCPC
    • C.The right ASCPC
    Show answer and explanation

    Correct answer: C. The right ASCPC

    The right ASCPC is in control of the outflow valves in automatic mode. Ref AMM 21-31-00.

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Part of the Boeing 777 B1.1 type course

One chapter of the Boeing 777 B1.1 type course question bank, for the 777-200/-200ER with GE90, PW4084 or Trent 800 engines, 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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