Type training · Boeing 737 Classic B1.1 · ATA 36

Boeing 737 Classic B1.1: Pneumatic (ATA 36)Type training questions & answers

5th and 9th stage bleed, PRSOV and precooler, isolation valve, APU and ground air, and bleed trip protection.

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Sample Pneumatic questions with answers

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

  1. 1.From which compressor stages does the 737 Classic CFM56-3 supply bleed air?

    • A.4th and 9th stage, HP only
    • B.7th and 10th stage
    • C.5th and 9th stage
    Show answer and explanation

    Correct answer: C. 5th and 9th stage

    Bleed air comes from the 5th stage normally and from the 9th (high) stage at low thrust. Ref 737-300/400/500 AMM 36-00-00.

  2. 2.When does the 737 Classic use 9th stage bleed air?

    • A.Idle or low thrust settings
    • B.At takeoff and climb thrust settings
    • C.Only when engine anti-ice is switched on
    Show answer and explanation

    Correct answer: A. Idle or low thrust settings

    5th stage air is used at all times except at idle or low thrust, when 9th stage air is used automatically. Ref 737-300/400/500 AMM 36-00-00.

  3. 3.Up to what altitude can the 737 Classic APU supply bleed air?

    • A.10,000 ft
    • B.25,000 ft
    • C.17,000 ft
    Show answer and explanation

    Correct answer: C. 17,000 ft

    The APU can be an alternate bleed source up to 17,000 ft. Ref 737-300/400/500 AMM 36-00-00.

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Part of the Boeing 737 Classic B1.1 type course

One chapter of the Boeing 737 Classic B1.1 type course question bank, for the 737-300/400/500 with CFM56-3 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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