Pressure Inside Airplane Cabin. The cabin pressurization and ventilation is controlled by opening and closing of outflow valves. On a typical flight the inside of an airplanes cabin is regulated to a pressure of about 11- 12 psi.
Air exits the cabin through outflow valves which are typically at the rear of the pressure vessel. On a typical flight as the aircraft climbs to 36000 feet the interior of the plane climbs to between 6000-8000 feet. Why Cabin Pressurization Is Important.
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Airplanes are designed to pump air into the cabin to mimic the 147 pounds per square PSI of pressure thats found at sea level. Pressurization systems are designed to keep the interior cabin pressure between 12 and 11 psi at cruise altitude. The packs condition the air for temperature and humidity typically taking all of the water out of the air and then pump this air into the cabin at high pressure such that it is at the proper temperature after expansion to cabin altitude. On a typical flight as the aircraft climbs to 36000 feet the interior of the plane climbs to between 6000-8000 feet.