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Aircraft AC Power System Overview
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Aircraft AC Power System Overview

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@HumaneBlackHole

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Questions and Answers

What happens if the AC source powering either transfer bus fails?

  • The main bus takes over powering the transfer bus.
  • Both galley busses will provide backup power.
  • The transfer bus will automatically switch to DC power.
  • The transfer bus can be powered by any available source through the tie bus with the bus tie breakers. (correct)

    • What happens when both generator control switches are OFF and the GRD PWR switch is turned ON?

  • External power is connected to both transfer busses. (correct)
  • The airplane loses all power sources.
  • The engines automatically start providing power to the main bus.
  • The APU automatically starts providing power to the galley busses.

    • Why is it not possible to power one transfer bus with external power and one transfer bus with APU power?

  • It exceeds the power capacity of the aircraft.
  • It would damage the bus tie breakers.
  • The transfer busses are interconnected. (correct)
  • It would cause a short circuit.

    • How can the transfer busses be powered from the engine generators?

    <p>By momentarily positioning the related generator switch to ON.</p> Signup and view all the answers

    What occurs if an engine generator is no longer supplying power?

    <p>Bus tie breakers close to allow the other engine generator to supply both transfer busses.</p> Signup and view all the answers

    What happens if both engines are shut down and APU GEN switch is turned ON?

    <p>APU power is supplied to both transfer busses.</p> Signup and view all the answers

    Why does external power or APU continue to supply power if engine generator power is applied?

    <p>To allow for maximum redundancy in case of failure.</p> Signup and view all the answers

    When does each engine generator normally power its own transfer bus?

    <p>In flight.</p> Signup and view all the answers

    How are the transfer buses powered when external power or APU powers both and engine generator power is applied?

    <p>External power or APU continues supplying power to both transfer buses.</p> Signup and view all the answers

    What is the function of BTBs in the AC power system?

    <p>To allow for automatic switching between AC sources when needed.</p> Signup and view all the answers

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