Type training · Boeing 757 B2 · ATA 34

Boeing 757 B2: Radio Altimeter and Ground Proximity Warning (ATA 34)Type training questions & answers

The three FM-CW radio altimeters and EADI displays, and the ground proximity warning system modes, windshear and tests.

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Sample Radio Altimeter and Ground Proximity Warning questions with answers

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

  1. 1.What is the radio altimeter operating frequency band?

    • A.C-band, 4300 MHz
    • B.L-band, 1090 MHz
    • C.VHF, 118 MHz
    Show answer and explanation

    Correct answer: A. C-band, 4300 MHz

    Three independent R/Ts use FMCW signals. Radio altitude shows on the EADI at 2,500 ft and below.

  2. 2.Why is radio altimeter antenna cable length critical?

    • A.It changes the beam width
    • B.It affects measured height
    • C.It sets the transmit power
    Show answer and explanation

    Correct answer: B. It affects measured height

    The cable has a 1-inch length tolerance. Antenna DC resistance above 5 ohms makes the output NCD.

  3. 3.What radio altitude does the EADI show while the R/T test switch is held?

    • A.2,500 feet
    • B.0 feet
    • C.40 feet
    Show answer and explanation

    Correct answer: C. 40 feet

    The test is inhibited in flight by the air/ground discrete, and by the FCCs when triple channel is armed after capture.

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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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