Type training · Boeing 757 B2 · ATA 34

Boeing 757 B2: Inertial Reference and EFIS (ATA 34)Type training questions & answers

Ring laser gyro IRUs, alignment and the IRMP, the VSI, EFIS symbol generators, display units and control panels.

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Sample Inertial Reference and EFIS questions with answers

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

  1. 1.What sensors does each inertial reference unit contain?

    • A.Two gyros and a flux valve magnetometer
    • B.One gyro and two accelerometers
    • C.Three gyros, three accelerometers
    Show answer and explanation

    Correct answer: C. Three gyros, three accelerometers

    Laser gyros sense pitch, roll and yaw rates; accelerometers sense longitudinal, lateral and vertical acceleration.

  2. 2.About how long does a normal IRS alignment take?

    • A.10 minutes
    • B.30 seconds
    • C.3 minutes
    Show answer and explanation

    Correct answer: A. 10 minutes

    The IRU finds local vertical and true north. For the first four minutes the IRMP shows 7 minutes remaining.

  3. 3.What happens if the airplane moves during IRS alignment?

    • A.The IRU switches to ATT mode
    • B.The IRU stops, then realigns
    • C.Alignment continues normally
    Show answer and explanation

    Correct answer: B. The IRU stops, then realigns

    IRS MOTION shows on the CDU. The IRU waits at least 30 s, then does a new 8-minute alignment once motion stops.

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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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