Pneumatics Flashcards
What is the purpose of the Air Conditioning System Controller (ACSC)?
Controls bleed valves and bleed distribution by monitoring duct pressure, controls bleed valves and bleed distribution by monitoring valve position and controls bleed valves and bleed distribution by monitoring ESC and Anti-Ice valve position.
Which bleed valves fail in the closed position?
Engine PRSOV, APU LCV and Engine HP bleed valve.
What is the purpose of the isolation valve?
Allows air from any source to supply both sides of the manifold
What type of engine air bleed valves are installed on the CRJ-700?
ACSC controlled PRSOVs.
After takeoff (no anti-icing required), what causes the bleeds to transfer from the APU to the engines?
Thrust levers retarded from TOGA, with gear up and flaps 20 degrees or less
When the High Pressure Bleed valve on the 10th stage is providing air, what effect does this have on the 6th stage?
6th stage air will be blocked by closure of the one-way check valve, preventing 10th stage air from backing up into the N2 compressor
It is not possible to use APU air in the wing anti-ice system with the Pneumatic system in AUTO, but it can be done with manual control of the bleed air system?
No. APU bleed cannot power the anti ice systems.
The PRSOVs on each engine should limit the pressure in the pneumatic system to _______.
45 +/- 3 psi.
With a loss of control power, the HPV, PRSOV and APU LCV will ___________.
Fail to the closed position.
The wing ISOL Valve switch and BLEED AIR SOURCE selector will only have an effect if___________.
The bleed valves control selector is placed in the MANUAL position..
During engine start, the pilot must select OFF with the A/C packs and open the ISOL valve.
False. Proper operation will be automatically controlled by the ASCS computers
The wing anti-ice cross bleed selector will allow one engine to be selected even with the bleed valves control selector in AUTO.
TRUE
