Type training · Boeing 757-300 differences · ATA 38

Boeing 757-300 Differences: Vacuum Waste System (ATA 38)Type training questions & answers

Vacuum toilets, waste tanks, blowers, the flush cycle and waste quantity indication.

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Sample Vacuum Waste System questions with answers

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

  1. 1.What kind of toilet system does the 757-300 in the differences course have?

    • A.Self-contained recirculating toilets
    • B.Chemical cassette toilets
    • C.A vacuum waste system
    Show answer and explanation

    Correct answer: C. A vacuum waste system

    Vacuum toilets send waste through lines to central waste tanks. The 757-200 FSL describes self-contained recirculating toilets, each with its own waste tank and flush motor.

  2. 2.How many waste tanks does the 757-300 vacuum waste system have?

    • A.One per lavatory
    • B.Four
    • C.Two
    Show answer and explanation

    Correct answer: C. Two

    Two waste tanks: waste system 1 and waste system 2 (aft tank). Each has its own blower, LCM and level sensors.

  3. 3.Where are the 757-300 waste tanks?

    • A.Aft cargo, right side
    • B.Under each lavatory
    • C.Forward cargo, left side
    Show answer and explanation

    Correct answer: A. Aft cargo, right side

    Both tanks are in the aft (bulk) cargo compartment on the right side. The waste service panel is on the aft fuselage lower left side.

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Part of the Boeing 757-200 to -300 differences course

One chapter of the Boeing 757-200 to -300 differences course question bank, for the 757-300, for engineers rated on the 757-200, 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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