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Aircraft AC Power System Overview

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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?

By momentarily positioning the related generator switch to ON. Signup and view all the answers

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

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

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

APU power is supplied to both transfer busses. Signup and view all the answers

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

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

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

In flight. 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?

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

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

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