APU

Question 1

What does the APU provide?

Answer 1

Pneumatic and electrical AC power

Question 2

How much power does the APU provide?

Answer 2

115v 40kva 400mgz

Question 3

How is the APU monitored?

Answer 3

FADEC

Question 4

What does the EMER STOP button do?

Answer 4

when pushed, the SOV for the fuel is closed

Question 5

What provides the fuel for the APU?

Answer 5

when DC available, DC fuel pump from the right engine. When AC is established, AC fuel pump. When the engine is running, the ejector pump from the right tank.

Question 6

Altitude Limits for the APU

Answer 6

the APU is able to supply:
A/C and pressurization up to 15000
Bleed air for engine start 21000
Electrical AC power to 33000
ABSOLUTE MAX to start APU is 30000

Question 7

How does the APU shut down normally?

Answer 7

after the switch is placed to off, the cool down period begins for 1 minute. Pneumatics are shut off immediately, the electrical after 1 min

Question 8

APU will shutdown in flight:

Answer 8

Underspeed, Over speed, FADEC critical error

Question 9

APU shutdown on the ground:

Answer 9

UFO + Sensor fail, EGT low oil pressure, high oil temperature and FIRE!! UFO SHELF

Question 10

Engine 2 uses what priority for bleed air?

Answer 10

APU over engine 1

Question 11

How long must you wait before attempting to start the APU?

Answer 11

30 seconds after the EICAS is energized

Question 12

Duty cycle for the APU

Answer 12

1&2 attempt cool down is 60 sec. third is 5 min off