Type training · Boeing 737 Classic B1.1 · ATA 26

Boeing 737 Classic B1.1: Fire Protection (ATA 26)Type training questions & answers

Engine, APU, wheel well and wing/body overheat detection, cargo and lavatory smoke, and the extinguishing systems.

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Sample Fire Protection questions with answers

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

  1. 1.How many fire extinguisher bottles serve the 737 Classic engines?

    • A.Two, either to either engine
    • B.One for each engine, fixed in place
    • C.Three, with one kept as a reserve
    Show answer and explanation

    Correct answer: A. Two, either to either engine

    Two bottles give two-shot extinguishing at either engine. Ref 737-300/400/500 AMM 26-00-00.

  2. 2.What logic do the 737 Classic dual engine fire detection loops normally use?

    • A.Both loops must sense fire
    • B.Either loop alone gives fire
    • C.Loop A alarms, loop B confirms later
    Show answer and explanation

    Correct answer: A. Both loops must sense fire

    Both loops must sense the fire for an alarm (AND logic); if one loop is inoperative the system can be set to the good loop. Ref 737-300/400/500 AMM 26-10-00.

  3. 3.What powers the 737 Classic engine and APU fire detection systems?

    • A.115 V ac transfer bus 1
    • B.28 V dc bus 2 only
    • C.28 V dc battery bus
    Show answer and explanation

    Correct answer: C. 28 V dc battery bus

    The fire detection systems use power from the 28 V dc battery bus. Ref 737-300/400/500 AMM 26-11-00.

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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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