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

Question 495 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Negative pressure relief valve will open.
Air cycle machine will stop.
Outflow valve open completely.
Negative pressure relief valve will close

Training tests and timed exam simulations ATPL - Airline Transport Pilot license