Type training · Boeing 757-300 differences · ATA 23

Boeing 757-300 Differences: Emergency Locator Transmitter (ATA 23)Type training questions & answers

The 121.5/243/406 MHz ELT, its battery, G switch, reset and test rules.

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Sample Emergency Locator Transmitter questions with answers

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

  1. 1.What powers the ELT transmitter in the 757-300 differences course?

    • A.The 28 V DC ground service bus
    • B.Its own battery pack
    • C.The hot battery bus
    Show answer and explanation

    Correct answer: B. Its own battery pack

    The transmitter does not use airplane power. Four D-size lithium manganese dioxide cells in series give it 12 V DC.

  2. 2.What is in the 757-300 ELT battery pack?

    • A.4 lithium D cells
    • B.8 NiCad C cells
    • C.2 lead-acid cells
    Show answer and explanation

    Correct answer: A. 4 lithium D cells

    Four D-size lithium manganese dioxide cells connected in series for 12 V DC. The pack is in the bottom of the transmitter.

  3. 3.Where is the 757-300 ELT transmitter installed?

    • A.In the aft cargo ceiling, sta 1200
    • B.Fwd of the recorder rack, sta 1500
    • C.Under the flight deck floor, sta 300
    Show answer and explanation

    Correct answer: B. Fwd of the recorder rack, sta 1500

    The transmitter is forward of the voice and flight data recorder rack at station 1500. The antenna is on top of the fuselage left of centre at station 1510.

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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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