490, APU

Question 1

If an APU Fire is detected on the ground:

• The APU automatically shuts down and the halon extinguisher is automatically discharged.
• The cockpit crew must manually extinguish the fire by pressing the APU MASTER SW pb off.
• There is no APU Fire protection available.
• The ground crew must manually extinguish the fire from the External Power panel.

Answer 1

The APU automatically shuts down and the halon extinguisher is automatically discharged.

Question 2

The APU may be started and operated in flight. Which of the following is also true?

• The APU is a good source of bleed air to supplement Engine and Wing Anti-ice.
• The APU will never provide bleed air in flight.
• The APU will never provide electrical power in flight.
• The APU may be operated up to the maximum certified pressure altitude of 39,000 feet.

Answer 2

The APU may be operated up to the maximum certified pressure altitude of 39,000 feet.

Question 3

You have just selected the APU MASTER SW pb to ON. You now select the APU START pb to ON. Which statement is correct?

• The APU start valve will open when sufficient pressure is available from the pneumatic system.
• The electric starter will immediately engage.
• The ECB will not engage the electric starter until the power-up self test is completed satisfactorily and the air intake flap is fully open.
• The starter will engage when you select the START pb again to the AVAIL position.

Answer 3

The ECB will not engage the electric starter until the power-up self test is completed satisfactorily and the air intake flap is fully open.

Question 4

How do you start the APU?

Answer 4

Press the APU MASTER SW pushbutton, followed 5 seconds later, by the APU START pushbutton.

Question 5

Normally, how do you shut down the APU?

Answer 5

Press the APU MASTER SW pushbutton only.

Question 6

The APU generator has the same power output as an engine generator.

True

False

Answer 6

True

Question 7

Fuel for APU operation is normally supplied from:

• The center fuel tank with pressure always supplied by the #2 center tank fuel pump.
• The APU fuel tank with pressure always supplied by a dedicated APU furl pump.
• The right wing tank outer cell through the engine 2 feed line.
• The left fuel feed line, through the engine 1 feed line.

Answer 7

The left fuel feed line, through the engine 1 feed line.