APU Flashcards

1
Q

Where does the APU get its fuel?

A

Fuel comes from the LEFT (main) Fuel Tank.

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2
Q

To what altitude does the APU provide power and bleed air?

A

APU supplies electrical power (43,100’) and Bleed Air (to approximately 17,000’).

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3
Q

What happens when you move the APU Start Switch ON?

A

The FAULT light cycles ON then OFF (as the APU Fuel Valve moves)

The APU door opens

The APU Fuel Valve opens

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4
Q

If you get an APU FAULT light, what happens?

A

The APU will automatically shut-down.

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5
Q

When the RUN Light flashes twice, what does this mean?

A

It is testing both APU Circuits.

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6
Q

What does the RUN light ON steady mean?

A

The APU is at speed and available for electric/air

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7
Q

Does the APU use an AC or DC powered fuel pump?

A

Both.

Initially it uses a DC powered pump, but when available

It uses an AC pump from the R AC Bus.

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8
Q

Placing the BAT switch OFF, (ON THE GROUND) will it shutdown the APU, not advised, why?

A

YES to SHUTDOWN on the ground.

Fire Protection is available, but NO DETECTION.

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9
Q

What does turning the BAT Switch off in flight do to the APU?

A

APU continues to run…

-No effect-

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10
Q

Which AC Power fuel pump is used for the APU?

A

L FWD FUEL PUMP.

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11
Q

The APU has a cool down cycle, if there was no pneumatic load, how does this affect the cooldown?

A

No cooldown cycle.

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