Type training · Boeing 757 B1.1 · ATA 21, 36

Boeing 757 B1.1: Air Conditioning and Pneumatics (ATA 21, 36)Type training questions & answers

Packs, zone temperature control, equipment cooling, pressurisation and the engine and APU bleed air system.

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Sample Air Conditioning and Pneumatics questions with answers

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

  1. 1.Which sources can supply the Boeing 757 pneumatic system?

    • A.Engines, APU and a ground air cart
    • B.The engines and the ram air turbine
    • C.The APU and two cabin superchargers
    Show answer and explanation

    Correct answer: A. Engines, APU and a ground air cart

    Engine bleed is the main source in flight. The APU (on the ground, and in flight below 17,500 ft) and a ground cart can also supply the system.

  2. 2.Which engine compressor stages supply bleed air on the RB211?

    • A.IP8 and HP3
    • B.HP2 and HP6
    • C.LP fan and HP3
    Show answer and explanation

    Correct answer: B. HP2 and HP6

    Air comes from the HP2 (intermediate) port and the HP6 (high stage) port. The high pressure shutoff valve (HPSOV) opens the high stage when HP2 pressure is too low.

  3. 3.What controls the high pressure shutoff valve (HPSOV)?

    • A.An electric motor actuator
    • B.The EEC through a torque motor
    • C.The high stage pilot, pneumatically
    Show answer and explanation

    Correct answer: C. The high stage pilot, pneumatically

    The HPSOV has no electrical parts. It is spring-loaded closed and opened by control pressure from the electropneumatic high stage pilot (HSP).

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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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