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Call of the Heavies > APU System > Flashcards

APU System Flashcards

1
Q

When does the APU inlet door open and close?

A

Prior to engine start and remains open until after shutdown.

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2
Q

The APU can be started on the ground and left running up to______.

A

20,000’

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3
Q

Can you start the APU in the air?

A

No

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4
Q

Where can you find the APU operating status? Things like EGT, N1, N2, Oil quantity.

A

STATUS page

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5
Q

How many APU generators?

A

2

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6
Q

Is the APU capable of supplying the entire electrical load of the aircraft?

A

Yes, only on the ground.

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7
Q

Can the APU provide any electricity in flight?

A

No

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8
Q

On the ground, the APU can run ____packs, except for during_____.

A

All (3) packs ; except during engine start.

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9
Q

In flight, the APU can run ____ pack(s) up to _____.

A

1 pack ; up to 15,000’

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10
Q

APU fuel is normally supplied from____.

A

Main tank 2

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11
Q

When AC power is available, the APU normally gets fuel from which pump?

A

Main pump 2 aft.

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12
Q

If main pump 2 aft supplies fuel to the APU, why does main pump 3 aft also run?

A

To prevent tank to tank transfer and also to be a backup if main 2 aft fails.

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13
Q

What supplies fuel to the APU when AC power is unavailable?

A

A dedicated DC pump.

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14
Q

Where is the DC fuel pump located?

A

Main tank 2

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15
Q

How many fire detection loops are in the APU compartment? How many loops required to trigger a fire warning?

A

2 (dual loop)

Only 1 is required to set off the warning.

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16
Q

If a fire is detected in the APU compartment, what happens?

A

-It sets off the warning
-It shuts off the APU

ON GROUND: It also discharges the fire bottle

17
Q

Where is the APU ground control fire protection panel?

A

In the right body gear well.

18
Q

What does the APU ground control fire protection panel provide?

A

-APU fire horn
-APU fire light
-A shut down Switch
-A shut down/arm lever
-A fire extinguisher discharge switch

19
Q

Do you need both batteries to start the APU?

A

Yes

20
Q

What components related to the APU are powered by the main battery (Main hot battery bus and main battery bus) ?

A

-APU fire extinguisher
-APU fuel valve
-Standby APU controller

21
Q

What components related to the APU are powered by the APU battery? (APU Hot Battery bus and the APU battery bus as a whole)

A

-DC starter and DC fuel pump
-APU inlet door and APU controller
-APU fire detection system

22
Q

What is the APU START SOURCE switch on the overhead MX panel that has 2 positions, TR and APU BATTERY for?

A

It is the start source for the APU.

TR: APU starter powered by a TR whenever utility bus 4 is powered.

APU BATTERY: APU starter powered by the batteries

23
Q

What does the OFF position do on the APU start selector?

A

-Closes the APU bleed air valve
-Initiates the normal shutdown
-Resets auto shutdown fault logic, except if the shutdown due to an APU bleed duct leak

24
Q

What does the ON position do on the APU start selector?

A

-Opens fuel valve and inlet door
-Arms APU bleed isolation valve
-Activates DC fuel pump or 2 AC fuel pumps as appropriate. (Main tank pump 2 and 3 aft)

25
Q

What does the START position do on the APU start selector?

A

INITIATES AUTOMATIC START SEQUENCE.

Initiates the start by:
-Opens APU fuel valve
-Opens inlet door
-Engages starter after inlet door opens
-Engages ignition

26
Q

When does the EICAS memo message APU RUNNING display?

A

When the APU start selector is in the ON position an APU RPM is 95% or more.

27
Q

After you start the APU, what is a good indication that air and electrical are available from the APU?

A

The memo message APU RUNNING

28
Q

After selecting OFF, the bleed air is cutoff from the APU. How long does the APU keep running for its cooldown?

A

60 seconds

29
Q

If the battery is positioned OFF prior to APU cooldown being complete, what happens?

A

The APU shuts down immediately

30
Q

Wait at least ____ minutes before placing the battery switch to OFF after the APU is selected OFF.

A

2

Call of the Heavies (39 decks)

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