Auxiliary Power Unit (APU) Flashcards Preview

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

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

Max permissible load on the APU generator

A

40 KVA

2
Q

Max altitude for staring

A

37,000 ft

3
Q

Max altitude for APU operation

A

41,000 ft

4
Q

Max altitude for APU bleed air extraction

A

25,000 ft

5
Q

Max speed with APU door open

A

220 KIAS if APU not operating, no speed if operating

6
Q

What battery voltage is required before starting the APU?

A

22 volts on both batteries

7
Q

What does the main battery power during an APU start

A

APU ECU

8
Q

What does the APU battery power during an APU start

A

Cranking of the 28 VDC starter motor

9
Q

When will the AVAIL switch light illuminate

A

99% RPM plus 2 seconds

10
Q

APU Starts RPM and EGT

A

106% / EGT 806c

11
Q

APU takes over from engines on landing when?

A

When gear is retracted or flaps are greater than 20 degrees

12
Q

Engines take over bleeds from the APU on takeoff when?

A

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