SELF-CHECK 4 / APU (Ch. 9)

Question 1

What does the APU provide?

A. Electrical power only
B. Electrical power and Bleed air
C. Reverse thrust
D. Noise reduction compliance

Answer 1

B. Electrical power and Bleed air.

Question 2

Where in the airplane is the APU installed?

A. Next to the crew entrance door
B. In the nose section
C. Forward of the baggage compartment
D. In the tail section

Answer 2

D. In the tail section.

Question 3

The APU uses the ____ battery for starting.

A. Right
B. Left
C. Emergency
D. A dedicated APU power-pack

Answer 3

A. Right.

Question 4

Starting the APU with the APU door closed is approved when OAT is at or below 10ºC.

A. True
B. False

Answer 4

B. False.

Question 5

When will the APU automatically shutdown?

A. Low EGT
B. Main engine fire
C. APU door failure
D. APU over speed

Answer 5

D. APU over speed.

Question 6

When may the APU generator be switched on?

A. Only when the main generators are off line
B. Anytime electrical power is desired
C. Once the crew receives the APU READY message
D. 5 minutes after starting

Answer 6

C. Once the crew receives the APU READY message.

Question 7

Pushing the APU FIRE pushbutton will discharge fire-extinguishing agent into the APU compartment.

A. True
B. Fals

Answer 7

B. Fals.

Question 8

Pushing the APU fire pushbutton does all of the following except:

A. Arm the APU fire extinguisher for operation
B. Shut down the APU
C. Close the APU fuel shutoff valve
D. Empty the fire bottle

Answer 8

D. Empty the fire bottle.

Question 9

Which fire bottle does the APU use?

A. Left
B. Right
C. Emergency
D. None

Answer 9

B. Right.

Question 10

Where is the APU EMER KILL switch located ?

A. Center pedestal
B. Equipment cabinet behind copilot seat
C. Overhead panel
D. In the ground service panel

Answer 10

D. In the ground service panel.

Question 11

Which pushbutton is used to discharge the right fire extinguisher into the APU compartment?

A. The right side ARM/EMPTY button
B. The left side ARM/EMPTY button
C. The overhead ARM/EMPTY button in the APU control panel
D. None; the extinguisher is discharged automatically

Answer 11

C. The overhead ARM/EMPTY button in the APU control panel.

Question 12

12. How does the pilot access APU bleed air?

A. Move the ECS switch to APU
B. Move the ECS switch to Both
C. Move the ECS switch to EMER
D. Move the ECS switch to RAM

Answer 12

A. Move the ECS switch to APU.

Question 13

Name eight malfunctions that will automatically shut down the APU

Answer 13

1. Fire
2. Overspeed
3. Overtemperature
4. Low oil pressure
5. Loss of EGT
6. Loss of RPM
7. High oil temperature
8. No acceleration.

Question 14

What happens when the APU FIRE pushbutton is pushed?

Answer 14

The right fire bottle discharge cartridge is armed, and fuel to the APU is cutoff.

Question 15

Can the APU be shut down from outside the airplane? Can the fire extinguisher be discharged to the APU compartment from outside the airplane?

Answer 15

Yes.

Question 16

Which fuel tank supplies fuel to the APU?

Answer 16

The right feed tank.

Question 17

Can the APU be started with only Hot Battery Bus power?

Answer 17

No. Electrical power must come from the right main battery or from external power.

Question 18

Is APU operation authorized if any engine fire extinguisher has been discharged?

Answer 18

No.

Question 19

What can be done from the cockpit to quiet the APU exhaust?

Answer 19

Push the AIRFLOW button on the center pedestal. This will increase the volume of air entering the cabin and cockpit. The button will illuminate HI FLOW

Question 20

How is the crew alerted to APU low oil quantity? Will the APU shut down automatically for low oil quantity?

Answer 20

We have a status message for APU OIL LEVEL LOW, but the APU will only shutdown for low oil pressure.

Question 21

When the APU control panel PRESS TO TEST pushbutton is pressed, what is indicated by illumination of the APU FIRE pushbutton?

Answer 21

The integrity of the sensor tube.

Question 22

What are the APU generator amperage limits on the ground and in the air?

Answer 22

400 amps on the ground
265 amps to 20,000 feet
120 amps to 30,000 feet
68 amps to 35,000 feet.