APU

Question 1

How is the APU controlled?

Answer 1

Electronic control box (ECB)

Question 2

Where does the app you source its fuel from?

Answer 2

The left in the wing cell

Question 3

When shut down and after the APU bleed air was in use how long and at what percentage N does the APU run for?

Answer 3

60-120seconds at 75% N

Question 4

What is the max APU EGT during start? And while APU is running?

Answer 4

1090°C
675°C

Question 5

What happens if the EGT reaches the red line

Answer 5

The ECB automatically shuts down the APU

Question 6

Can APU bleed air be used for wing anti-icing?

Answer 6

No, it is prohibited

Question 7

What is the maximum altitude for a battery start of the APU?

Answer 7

25,000 feet

Question 8

Up to what altitude may the APU be operated to?

Answer 8

39,000 feet

Question 9

Below what altitude can the APU supply bleed air and electrical panel?

Answer 9

22,500 feet

Question 10

Above what altitude, can the APU supply only electrical power?

Answer 10

22,500 feet

Question 11

What is the maximum altitude for a ground start/operation of the APU?

Answer 11

14,500 feet

Question 12

What is the APU starting sequence limitation?

Answer 12

Three cycles with at least 60 seconds break in between each cycle and 60 minutes break after the third cycle.

Question 13

What is the maximum N speed for the APU?

Answer 13

107%