Pneumatic / Air Conditioning / Pressurization Flashcards
(26 cards)
When does the Bleed Air switch from APU to Engines during takeoff?
Gear up and Flaps 20 or less, and thrust levers retarded from TOGA
When does the Bleed Air switch from Engines to APU during landing?
Flaps greater than 20 or landing gear down
Will the ACSC allow the APU to provide bleed air to the wings anti ice?
No
Normal pressure differential is?
8.5 psi
Max pressure differential?
8.7 psi
Max pressure differential during taxi, takeoff and landing?
0.1 psi
Max negative pressure differential?
-0.5
During single PACK operation, what is the max altitude?
25,000 ft
How many pressurization controllers are installed on the CRJ 900?
2, pc1 and pc2
When do the pressurization controllers swap?
Weight on wheels + 3 minutes or if one PC fails, the redundant controller takes over
When operating in auto mode, what is the cabin rate of climb and descent?
500 fpm climb
300 fpm descent
When operating in manual mode, what range is controlled by the MAN RATE knob?
50 fpm to 3000fpm
+/- 1000 fpm
When will the primary page indicate a CABIN ALT Caution message?
Cabin altitude between 8500 and 10,000ft
When will the primary page indicate a CABIN ALT Warning message?
Cabin altitude >10,000ft
When will the CPAM automatically deploy the passenger oxygen masks?
Cabin altitude > 14,000 ft
When will CPAM turn on the NO SMOKING / FASTEN SEATBELT signs?
Cabin altitude > 10,000 ft
(with switches in the AUTO position)
Can we carry live animals in the cargo compartment of the CRJ 900?
Yes, Aft cargo compartment only
What causes the FAULT portion of a PACK switchlight to illuminate?
Over Pressure or Over Temperature condition
What causes the FAULT portion of the PRESS CONT switchlight to illuminate?
Both pressurization controllers have failed
After a pack high temperature shutdown, can the pack automatically restart?
Yes, it will restart when it cools down
Where are the temperature sensors located in the cabin?
One in the front, one in the rear
What must be done before the low-pressure air can be turned on?
The main cabin door or avionics bay door must be open
What indicates which CPC is active?
EICAS ECS page
What does an amber CARGO OVHT on the EICAS indicate?
Rear cargo compartment is above 40c with the conditioned air turned on
