Type training · Boeing 757 B2 · ATA 34

Boeing 757 B2: Flight Management Computer System (ATA 34)Type training questions & answers

FMCs and CDUs, sensors and radio updating, dual operation, CDU pages, messages, maintenance pages and database loading.

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Sample Flight Management Computer System questions with answers

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

  1. 1.How often is the FMC navigation database updated?

    • A.Every 90 days
    • B.Every 7 days
    • C.Every 28 days
    Show answer and explanation

    Correct answer: C. Every 28 days

    If the clock date is outside the active database dates, NAV DATA OUT OF DATE shows in the scratch pad.

  2. 2.With GPS turned off, what is the FMC's preferred radio position source?

    • A.DME/DME from two stations
    • B.VOR/DME from one station
    • C.Localizer deviation
    Show answer and explanation

    Correct answer: A. DME/DME from two stations

    If DME/DME is not available it uses VOR/DME, and without radio updates it uses the IRS.

  3. 3.How does the FMC normally use IRS position data?

    • A.A weighted average of three IRUs
    • B.Only the left IRU, always
    • C.Only the IRU of the autopilot in CMD
    Show answer and explanation

    Correct answer: A. A weighted average of three IRUs

    An IRU differing by more than 30 nm from the average is not used. Heading uses the IRU of the autopilot in command.

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Part of the Boeing 757 B2 type course

One chapter of the Boeing 757 B2 type course question bank, for the 757-200 avionics, 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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