Type training · Boeing 757 B1.1 · ATA 49

Boeing 757 B1.1: Auxiliary Power Unit (ATA 49)Type training questions & answers

APU starting, fuel, oil, bleed air, controls, indication and the protective shutdowns.

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Sample Auxiliary Power Unit questions with answers

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

  1. 1.Which APU model is installed in the Boeing 757 (RB211 airplanes) described in this course?

    • A.Hamilton Sundstrand APS 2000
    • B.Pratt & Whitney PW901A
    • C.Allied Signal GTCP 331-200ER
    Show answer and explanation

    Correct answer: C. Allied Signal GTCP 331-200ER

    The APU is an Allied Signal (Garrett) GTCP 331-200ER gas turbine, installed in the tailcone (section 48).

  2. 2.What power does the APU supply?

    • A.Electrical power only, on the ground
    • B.Electrical and pneumatic power
    • C.Pneumatic and hydraulic power
    Show answer and explanation

    Correct answer: B. Electrical and pneumatic power

    The APU drives a 90 kVA generator and a load compressor, giving electrical and pneumatic power on the ground and in the air.

  3. 3.Up to what altitude is APU pneumatic power available?

    • A.25,000 ft
    • B.10,000 ft
    • C.17,500 ft
    Show answer and explanation

    Correct answer: C. 17,500 ft

    Pneumatic pressure is available up to 17,500 ft (5,300 m). The generator supplies 90 kVA at any altitude.

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Part of the Boeing 757 B1.1 type course

One chapter of the Boeing 757 B1.1 type course question bank, for the 757-200 with Rolls-Royce RB211-535E4 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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