Auxiliary Power Unit (APU) Flashcards Preview

CRJ-900 Limitations > Auxiliary Power Unit (APU) > Flashcards

Flashcards in Auxiliary Power Unit (APU) Deck (12):
1

Max permissible load on the APU generator

40 KVA

2

Max altitude for staring

37,000 ft

3

Max altitude for APU operation

41,000 ft

4

Max altitude for APU bleed air extraction

25,000 ft

5

Max speed with APU door open

220 KIAS if APU not operating, no speed if operating

6

What battery voltage is required before starting the APU?

22 volts on both batteries

7

What does the main battery power during an APU start

APU ECU

8

What does the APU battery power during an APU start

Cranking of the 28 VDC starter motor

9

When will the AVAIL switch light illuminate

99% RPM plus 2 seconds

10

APU Starts RPM and EGT

106% / EGT 806c

11

APU takes over from engines on landing when?

When gear is retracted or flaps are greater than 20 degrees

12

Engines take over bleeds from the APU on takeoff when?

When gear is up and flaps are 20 degrees or less and thrust levers out of the TOGA detent.