Type training · Boeing 777 B1.1 · ATA 75–80

Boeing 777 B1.1: PW4084 Air, Reverser, Oil and Starting (ATA 75–80)Type training questions & answers

Cooling and bleed valves, EEC modes, indicating, thrust reverser, oil and starting.

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Sample PW4084 Air, Reverser, Oil and Starting questions with answers

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

  1. 1.What is the PW4084 bearing cooling system for?

    • A.Seal pressure, No. 3 cooling
    • B.Cooling all the bearing sumps
    • C.Cooling the stage 12 bleed air
    Show answer and explanation

    Correct answer: A. Seal pressure, No. 3 cooling

    It pressurizes the carbon seals and cools the No. 3 bearing compartment. Ref AMM 75-22-00.

  2. 2.What is true of the PW4084 No. 3 bearing buffer air cooler?

    • A.Stage 4 air cools stage 12, external tube
    • B.Stage 4 air cools stage 12, internal tube
    • C.Stage 12 goes via internal passages
    Show answer and explanation

    Correct answer: A. Stage 4 air cools stage 12, external tube

    Stage 12 air is cooled by stage 4 air and then goes through an external tube to the No. 3 bearing. Ref AMM 75-22-00.

  3. 3.What is the PW4084 nacelle zone ventilation for?

    • A.Fan air to cool LPC and diffuser
    • B.Fan air to cool HPC and diffuser
    • C.LPC air to cool HPC and diffuser
    Show answer and explanation

    Correct answer: B. Fan air to cool HPC and diffuser

    Fan air cools the HPC and diffuser case. Ref AMM 75-23-00.

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Part of the Boeing 777 B1.1 type course

One chapter of the Boeing 777 B1.1 type course question bank, for the 777-200/-200ER with GE90, PW4084 or Trent 800 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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