Air Conditioning, Pressurization Flashcards
Max pressure differential is?
8.7 PSI
Max pressure differential during taxi, takeoff and landing?
0.1 PSI
Max negative pressure differential?
-0.5 PSI
During single PACK operation, what is the Max altitude?
CRJ 900/900EP - FL 250
What does the DISPLAY COOL or ARINC COOL caution messages 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 decent?
500 FPM climb
300 FPM decent
When operating in the manual mode, what range is controlled by the MAN RATE knob?
50 FPM to 3000 FPM
plus/minus 1000
When will the primary page indicate a CABIN ALT caution message?
Cabin altitude between 8,500 and 10,000 feet
When will the primary page indicate a CABIN ALT warning message?
Cabin altitude >10,000 ft
When will CPAM automatically deploy the passenger oxygen masks?
Cabin alt of >14,000 feet
When will CPAM turn on the NO SMOKING/FASTEN SEATBELT signs?
Cabin altitude >10,000 feet
with switches in the AUTO position
Can we carry live animals in the cargo compartment of the CRJ900?
Yes. Aft cargo compartment only.
What causes the FAULT portion of a PACK switch light to illuminate?
Over pressure or over temperature condition
