Type training · Boeing 737 Classic B1.1 · ATA 24

Boeing 737 Classic B1.1: Electrical Power (ATA 24)Type training questions & answers

CSD and VSCF generators, bus transfer, external power, TRs and battery, and the standby power system.

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Sample Electrical Power questions with answers

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

  1. 1.How many 115 V ac generators supply the 737 Classic electrical system?

    • A.Three
    • B.Two, both engine driven
    • C.Four, with a RAT generator
    Show answer and explanation

    Correct answer: A. Three

    Two engine-driven generators and one APU generator supply isolated 115/200 V, 3-phase, 400 Hz power. Ref 737-300/400/500 AMM 24-00-00.

  2. 2.Can the 737 Classic main ac generators be paralleled?

    • A.Yes, through a tie bus
    • B.Only on the ground
    • C.No, they are isolated
    Show answer and explanation

    Correct answer: C. No, they are isolated

    The generators are isolated; each source switched on takes over its gen bus and switches off the source that was on before. Ref 737-300/400/500 AMM 24-00-00.

  3. 3.At what speed does the 737 Classic CSD drive the generator?

    • A.8,000 rpm
    • B.12,000 rpm
    • C.6,000 rpm
    Show answer and explanation

    Correct answer: C. 6,000 rpm

    The constant speed drive holds generator speed at 6,000 rpm so the output is 400 Hz. Ref 737-300/400/500 AMM 24-11-00.

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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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