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Flashcards in APU Deck (17):
1

Which FADEC controls the APU?

It has it's own DEDICATED FADEC

2

How does the APU get it's fuel when only DC power is available?

The DC fuel pump located in the right wing

3

Where does the APU get it's fuel when the engines are running?

From the right wing tank via the ejector pump.

4

Up to what altitude can the APU be used to supply AC power?

33,000 ft

5

Up to what altitude can the APU be used to supply bleed air for engine starts?

21,000 ft

6

Up to what altitude can the APU be used air conditioning and pressurization?

15,000 ft

7

What is the max altitude the APU can be started?

30,000 ft

8

What is the cool down period for normal APU shutdown?

One minute

9

Does the APU go through a one minute cool down period if the EMER STOP button is pressed?

NO

10

The APU will automatically shutdown on the ground when??

Overspeed
Underspeed
FADEC critical fault
APU Fire
APU EGT overtemp
APU high oil temp
Low Oil Pressure
Sensor Fail

11

The APU will automatically shutdown in the air for the following conditions:

Overspeed
Underspeed
FADEC Critical Fault

12

Will the APU shutdown in flight for a fire?

NO

13

Will the APU shutdown in flight for high oil temp or low oil pressure?

NO

14

Why do you need both batteries for APU start?

Battery one provides FADEC
Battery two powers the APU Start Bus

15

What does the EMER STOP push button do?

It shuts off the APU immediately with no cool down period by closing APU fuel shutoff valve

16

Where does the APU get it's fuel when the engines are running?

From the ejector pump in the right wing tank

17

____ seconds after the APU has reached __% electrical and pneumatic loading is available?

3 seconds
95 %