APU

Question 1

Name three times starting the APU is prohibited

Answer 1

1. Until a satisfactory APU test has been accomplished as contained in the normal procedures section of supplement 16 of the AFM.
2. When the APU fail light is illuminated.
3. Following a dual generator failure.

Question 2

Once the APU has been shut down for any reason when can it be restarted?

Answer 2

After the RPM indicator reads 0% for at least 30 seconds.

Question 3

How does applying deice fluid restrict the operation of the APU?

Answer 3

Running the APU is prohibited during the application of the deice fluid.

Question 4

What is the limitation of the thrust reversers when the APU is operating?

Answer 4

Thrust reversers cannot be deployed for longer than 30 seconds with the APU operating.

Question 5

What is the requirement for running the APU unattended?

Answer 5

The APU is not approved for unattended operation.

Question 6

What is the start cycle limitation for the APU?

Answer 6

The APU is limited to three start cycles per 30 minutes. The cycles of operation with 90 second rest periods between start cycles.

Question 7

How many times can the APU be started in one hour?

Answer 7

9 according to battery start limitations, but only 6 according to starter generator limitations.

Question 8

When starting the main engines using a cross generator start from the APU how many battery start cycles are counted?

Answer 8

1/3 of a battery start per engine

Question 9

What is the altitude limit for starting the APU?

Answer 9

20,000 feet

Question 10

What is the altitude limit for operating the APU?

Answer 10

30,000 feet

Question 11

Procedure when the APU fire warning light illuminates.

Answer 11

Lift cover on the APU fire warning light and push

Question 12

What will happen if the APU detects a fire and the fire warning light is not pushed?

Answer 12

The fire extinguishing bottle will discharge after 8 seconds.