SELF-CHECK 4 / APU (Ch. 9) Flashcards
What does the APU provide?
A. Electrical power only
B. Electrical power and Bleed air
C. Reverse thrust
D. Noise reduction compliance
B. Electrical power and Bleed air.
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
D. In the tail section.
The APU uses the ____ battery for starting.
A. Right
B. Left
C. Emergency
D. A dedicated APU power-pack
A. Right.
Starting the APU with the APU door closed is approved when OAT is at or below 10ºC.
A. True
B. False
B. False.
When will the APU automatically shutdown?
A. Low EGT
B. Main engine fire
C. APU door failure
D. APU over speed
D. APU over speed.
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
C. Once the crew receives the APU READY message.
Pushing the APU FIRE pushbutton will discharge fire-extinguishing agent into the APU compartment.
A. True
B. Fals
B. Fals.
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
D. Empty the fire bottle.
Which fire bottle does the APU use?
A. Left
B. Right
C. Emergency
D. None
B. Right.
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
D. In the ground service panel.
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
C. The overhead ARM/EMPTY button in the APU control panel.
- 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
A. Move the ECS switch to APU.
Name eight malfunctions that will automatically shut down the APU
- Fire
- Overspeed
- Overtemperature
- Low oil pressure
- Loss of EGT
- Loss of RPM
- High oil temperature
- No acceleration.
What happens when the APU FIRE pushbutton is pushed?
The right fire bottle discharge cartridge is armed, and fuel to the APU is cutoff.
Can the APU be shut down from outside the airplane? Can the fire extinguisher be discharged to the APU compartment from outside the airplane?
Yes.
Which fuel tank supplies fuel to the APU?
The right feed tank.
Can the APU be started with only Hot Battery Bus power?
No. Electrical power must come from the right main battery or from external power.
Is APU operation authorized if any engine fire extinguisher has been discharged?
No.
What can be done from the cockpit to quiet the APU exhaust?
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
How is the crew alerted to APU low oil quantity? Will the APU shut down automatically for low oil quantity?
We have a status message for APU OIL LEVEL LOW, but the APU will only shutdown for low oil pressure.
When the APU control panel PRESS TO TEST pushbutton is pressed, what is indicated by illumination of the APU FIRE pushbutton?
The integrity of the sensor tube.
What are the APU generator amperage limits on the ground and in the air?
400 amps on the ground
265 amps to 20,000 feet
120 amps to 30,000 feet
68 amps to 35,000 feet.
