Type training · Boeing 737NG B1.1 · ATA 49

Boeing 737NG B1.1: 131-9B APU (ATA 49)Type training questions & answers

APU limits and start sequence, ECU protective shutdowns, fuel and bleed systems, IGVs, mounts and servicing.

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Sample 131-9B APU questions with answers

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

  1. 1.Up to what altitude can the 737NG APU give bleed and electrics together?

    • A.10,000 ft
    • B.17,000 ft
    • C.41,000 ft
    Show answer and explanation

    Correct answer: A. 10,000 ft

    Electrical and pneumatic power together to 10,000 ft; pneumatic alone to 17,000 ft; electrical to 41,000 ft. Ref Boeing 737-600/700/800/900 training manual, ATA 49.

  2. 2.What APU generator output does the 737NG give at 41,000 ft?

    • A.90 kVA
    • B.45 kVA
    • C.66 kVA
    Show answer and explanation

    Correct answer: C. 66 kVA

    90 kVA up to 32,000 ft and 66 kVA up to 41,000 ft. Ref Boeing 737NG training manual, ATA 49.

  3. 3.What are the main parts of the 737NG APU engine?

    • A.A gas generator with a free power turbine
    • B.A two-spool core driving a small fan
    • C.Power section, load compressor, gearbox
    Show answer and explanation

    Correct answer: C. Power section, load compressor, gearbox

    The APU has a power section (single-stage centrifugal compressor), a load compressor and an accessory gearbox. Ref Boeing 737NG training manual, ATA 49.

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Part of the Boeing 737NG B1.1 airframe and systems course

One chapter of the Boeing 737NG B1.1 airframe and systems course question bank, for the 737-600/700/800/900, 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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