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CRJ-900 Limitations > Air Conditioning / Presurization > Flashcards

Flashcards in Air Conditioning / Presurization Deck (17):
1

Max pressure differential is

8.7 psi

2

Max pressure differential during taxi, takeoff and landing

O.1 psi

3

Max negative pressure differential

- 0.5 psi

4

During single PACK operation, what is the max altitude

CRJ-900 FL 250
CRJ-700 FL 310

5

What does the DISPLAY COOL or ARINC COOL caution message mean

Low airflow behind screens or within the avionics rack

6

How many pressurization controllers are installed on the CRJ-900

2, PC1 and PC2

7

When do the pressurization controllers swap

Weight on wheels plus 3 minutes or if one PC fails the redundant controller takes over

8

When operating in the auto mode what is the cabin rate of climb and descent

500 fpm climb 300 fpm descent

9

When operating in the manual mode what range is controlled by the MAN RATE knob

50 fpm to 3000 fpm -+ 1000

10

When will the primary page indicate a CABIN ALT caution message

Cabin altitude between 8,500-10,000ft

11

When will the primary page indicated a CABIN ALT warning message

Cabin alt > 10,000ft

12

When will CPAM automatically deploy the passenger oxygen masks

Cabin alt > 14,000 ft

13

When will CPAM turn on the NO SMOKING/FASTEN SEAT BELT sign

Cabin alt > 10,000ft (with switches in the auto position)

14

Can we carry live animals in the cargo compartment of the CRJ-900

Yes, aft cargo compartment only (heated)

15

What causes the FAULT portion of a pack switch light to illuminate

Over pressure or over temperature condition

16

What causes the FAULT portion of the PRESS CONT switch-light to illuminate

Both pressurization controllers have failed

17

Normal pressure differential is

8.5 psi