If the pressure in the cabin tends to become lower than the outside ambient air pressure the:

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Question ATPL - Airline Transport Pilot license - Aircraft General Knowledge - Airframe, Systems, Powerplant

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Negative pressure relief valve will open.

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Air cycle machine will stop.

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Outflow valve open completely.

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Negative Pressure Relief Valve Will Close

Id 495 - ATPL - If the pressure in the cabin tends to become lower than the outside ambient air pressure the: