Air Conditioning / Presurization Flashcards
Max pressure differential is
8.7 psi
Max pressure differential during taxi, takeoff and landing
O.1 psi
Max negative pressure differential
- 0.5 psi
During single PACK operation, what is the max altitude
CRJ-900 FL 250
CRJ-700 FL 310
What does the DISPLAY COOL or ARINC COOL caution message mean
Low airflow behind screens or within the avionics rack
How many pressurization controllers are installed on the CRJ-900
2, PC1 and PC2
When do the pressurization controllers swap
Weight on wheels plus 3 minutes or if one PC fails the redundant controller takes over
When operating in the auto mode what is the cabin rate of climb and descent
500 fpm climb 300 fpm descent
When operating in the manual mode what range is controlled by the MAN RATE knob
50 fpm to 3000 fpm -+ 1000
When will the primary page indicate a CABIN ALT caution message
Cabin altitude between 8,500-10,000ft
When will the primary page indicated a CABIN ALT warning message
Cabin alt > 10,000ft
When will CPAM automatically deploy the passenger oxygen masks
Cabin alt > 14,000 ft
When will CPAM turn on the NO SMOKING/FASTEN SEAT BELT sign
Cabin alt > 10,000ft (with switches in the auto position)
Can we carry live animals in the cargo compartment of the CRJ-900
Yes, aft cargo compartment only (heated)
What causes the FAULT portion of a pack switch light to illuminate
Over pressure or over temperature condition
