Pressurization Flashcards
What are the electro pneumatic system components?
Digital controller Electro and pneumatic outflow valve Air filter 2 pressure regulating valves Ejector pump 2 static ports CPAM
How is pressure regulated?
Regulating air through an electro pneumatic and pneumatic outflow valves.
What will happen with the dump button in auto mode?
The system depressurizes to a maximum of 14,500’
What happens when pressure is over 8.1 psi?
Pressure relief valve opens
How are the the two pneumatic valves connected?
Interconnection tube, with the pneumatic valve slaved to the electro pneumatic valve.
What does the CPAM do?
Senses the cabin altitude and cabin differential pressure and derives the rate of change.
What happens in the takeoff sequence?
Pressure is added at -450 ft per minute until .2psid, for 15 minutes or until theoretical cabin altitude is reached.
What happens on descent?
The cabin pressurizes to 300’ below field elevation.
What happens in the auto depressurization sequence?
Once the weight on wheels is activated the cabin depressurizes at 650 ft per minute to just below field elevation to reduce noise.
