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#6
01-15-16, 01:05 AM
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The outflow valve is closed with the power off. When you put the pressurization switch to "on", it takes power off that valve and the valve is closed, allowing pressurization. When you switch to "off", it sends power to the valve opening it and preventing pressurization. The P337 pressurization system is completely pneumatic, doesn't need any electricity to pressurize the cabin.
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