Type training · Boeing 777 B1.1 · ATA 47

Boeing 777 B1.1: Nitrogen Generation System (ATA 47)Type training questions & answers

NGS shutoff valve, ozone converter, heat exchangers, turbo compressor, air separation modules, NEADS and BITE.

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Sample Nitrogen Generation System questions with answers

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

  1. 1.What does the 777 nitrogen generation system (NGS) do?

    • A.Inflates the main gear tyres
    • B.Inerts the center fuel tank
    • C.Pressurises the cargo fire bottles
    Show answer and explanation

    Correct answer: B. Inerts the center fuel tank

    The NGS lowers the oxygen content of the center tank ullage below the level that supports combustion, using nitrogen-enriched air (NEA). Ref Olympic B777 training manual, ATA 47.

  2. 2.Where does the 777 NGS get its air supply?

    • A.Left side of pneumatic manifold
    • B.Right pack outlet duct (cooled)
    • C.APU load compressor duct only
    Show answer and explanation

    Correct answer: A. Left side of pneumatic manifold

    Bleed air comes from the left side of the pneumatic manifold through the NGS shutoff valve. Ref Olympic B777 training manual, ATA 47.

  3. 3.Which 777 NGS fuel tank receives nitrogen-enriched air?

    • A.All three fuel tanks
    • B.The center wing tank
    • C.Both main wing tanks
    Show answer and explanation

    Correct answer: B. The center wing tank

    NEA goes only to the center wing tank, through an ejector nozzle in its right side. Ref Olympic B777 training manual, ATA 47.

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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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