Type training · Boeing 757 B2 · ATA 34

Boeing 757 B2: ATC, TCAS and Weather Radar (ATA 34)Type training questions & answers

ATCRBS and Mode S transponders, TCAS, and the X-band weather radar, antenna stabilization and displays.

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Sample ATC, TCAS and Weather Radar questions with answers

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

  1. 1.On which frequencies does the ATC transponder receive and reply?

    • A.Receives 1090 MHz, replies 1030 MHz
    • B.Receives 1030 MHz, replies 1090 MHz
    • C.Receives and replies on 1030 MHz
    Show answer and explanation

    Correct answer: B. Receives 1030 MHz, replies 1090 MHz

    Ground stations and TCAS interrogate on 1030 MHz. The transponder replies to modes A, C and S on 1090 MHz.

  2. 2.How are the two ATC antennas connected when the right transponder is selected?

    • A.Top to the right, bottom to the left
    • B.The right uses its own antennas
    • C.Antenna switches connect both to it
    Show answer and explanation

    Correct answer: C. Antenna switches connect both to it

    With L selected the antenna switches stay de-energised. The unused transponder gets a standby discrete.

  3. 3.Where does the ATC transponder get altitude for mode C replies?

    • A.From the air data computers
    • B.From the radio altimeters
    • C.From the IRS inertial altitude
    Show answer and explanation

    Correct answer: A. From the air data computers

    Each transponder uses its on-side ADC, or the other ADC when the air data source switch is in ALTN.

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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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