Pneumatic Flashcards
Normal pressure differential?
8.5 psi
Max pressure differential?
8.7 psi
Max pressure differential during taxi, takeoff, & landing?
0.1 psi
Max negative pressure differential?
-0.5 psi
During single PACK ops, what is the ma altitude?
900/900EP - FL250
700 - FL310
What does the DISPLAY COOL or ARINC COOL Caution messages mean?
Low airflow behind screens or within the avionics rack
How many pressurization controllers (PC’s) in the 900?
2, PC1 & PC2
When do the pressurization controllers swap?
WOW+3 minutes, or if one PC fails
When in auto mode, what is the cabin rate of climb & descent?
+500 fpm
-300 fpm
When in manual mode, what range is controlled by the MAN RATE knob?
50 - 3000 fpm
+/- 1000 fpm
When will we get a CABIN ALT Caution message?
Cabin altitude between 8,500 to 10,000 ft
When will we get a CABIN ALT Warning message?
Cabin altitude >10,000 ft
When will CPAM auto deploy pax oxygen masks?
Cabin altitude >14,000 ft
When will CPAM turn on NO SMOKING/FASTEN SEATBELT signs?
Cabin altitude >10,000 ft (switch in AUTO position)
What causes FAULT portion of a PACK switchlight to illuminate?
Over pressure or Over temperature condition
What causes FAULT portion of the PRESS CONT switchlight to illuminate?
Both pressurization controllers have failed
ACSC’s
Air Conditioning System Controllers
How many sections is the bleed air manifold separated into, and by what?
2, by the isolation valve
What psi do the engine bleed valves regulate pressure to?
Regulate pressure to 45 psi +/- 3 psi
When do the bleed air valves close?
- engines are shutdown
- ACSC signal is removed
- ENG FIRE PUSH switchlight to that engine
- manually on the BLEED AIR control panel
When do the high pressure valves close?
- engines are shutdown
- ACSC signal is removed
- ENG FIRE PUSH switchlight to that engine
- manually on the HPV casing
Do the LCV & bleed valves do the same thing?
Yes
Which side of the bleed air manifold does the LCV deliver bleed air to when the ISOL valve is closed?
Left
What can close the APU LCV?
- APU shutdown
- loss of ECU or ACSC
How many ACSC’s?
2 (ACSC1 for left eng/ACSC2 for right eng)
Can the APU provide anti-ice?
No
Does bleed air switch from the APU to engines in-flight automatically?
Yes
How are bleed air leaks detected in the bleed air ducts & anti-ice ducts in the fuselage & wings?
Dual loops
What is used to detect bleed air leaks in the cowl anti-ice ducts located in the engine pylons?
Pressure transducers
Is there a test system for the bleed air leak detection system?
No
Must both loops detect the high temperature?
Yes, unless one is inoperative
AILC
Anti-Ice Leak-Detection Controller
Where is the pneumatic system controlled from?
BLEED AIR control panel
What pneumatic valves will close if the ENG FIRE PUSH switch is pressed?
BLEED VALVE & HPV
What will close if the APU FIRE PUSH switch is pressed?
LCV
