How do pilots pressurize the cabin?

Airplanes pressurize their cabins by pumping air into them. As their jet engines suck in air, some of the excess air is diverted into the airplane's cabin. The air is both cooled and humidified — meaning moisture is added to it — after which it's circulated into and throughout the cabin.



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In the no-bleed architecture, electrically driven compressors provide the cabin pressurization function, with fresh air brought onboard via dedicated cabin air inlets.

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The primary problem is low oxygen, says Professor Frances Ashcroft, a physiologist at Oxford University. Low pressure would cause little more than discomfort in the ears and eyes, but the associated drop in oxygen levels makes people pass out if they do not put their oxygen masks on within about 15 seconds.

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How high can you fly without a pressurized cabin? Most planes flying today use a cabin pressure control system that ensures safe and normal breathing for everyone onboard during flight. The general rule is that planes should have cabin pressurization when they go above 10,000 to 14,000 feet.

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If the plane is somehow kept pressurized, the cabin pressure is usually equivalent of 6000–8000 ft, which is lower pressure than the outside at sea level. Which means as soon as you unlock the door, it will swing inwards with a lot of force, as air from outside rushes in to re-pressurize the cabin.

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Pilot and Vietnam War veteran Pete Jordan knows exactly what happens when a pressurized cabin decompresses 30,000 feet in the air at 300 to 600 mph: There's no oxygen, and it gets damn cold in a hurry. An open door would release the cabin's ball of pressure, causing an immediate suction explosion.

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What happens if you open a pressurized door? If someone were to open a door while in an airplane, the consequences would be dire. The sudden decrease in air pressure would cause the plane to rapidly lose altitude and could potentially lead to a crash.

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The pilot can sleep for no more than 40 minutes, and must wake up at least half an hour before the descent for landing. They get the first 15 minutes after the nap to fully awaken, during which they can't resume actually flying the plane, unless they need to help deal with an emergency.

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If pilots tell the airline they're fatigued, the pilot is automatically removed from the flight with no questions. This often times leads to delays and cancelations.

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Fatigue is particularly prevalent among pilots because of unpredictable work hours, long duty periods, circadian disruption, and insufficient sleep. These factors can occur together to produce a combination of sleep deprivation, circadian rhythm effects, and 'time-on task' fatigue.

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The carbon-fibre structure of the 787 allows the aircraft to be pressurized to a much higher level than on many other aircraft types. The lower the cabin altitude, the better you feel both during and after the flight, allowing your body to adjust to your new time zone more quickly.

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after the flight. Even if you are flying a pressurized aircraft, altitude DCS can occur as a result of sudden loss of cabin pressure (inflight rapid decompression).

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Harrowing video shows the moment a plane's door burst open during a flight over Brazil, causing the aircraft to make an emergency landing. The passengers and crew received medical assistance, but there were no serious injuries, the airport said.

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Is it at all even possible for it to just drop? According to my company's training materials, an FAA study in the 1960s of depressurization events in business, airline, and military jet transport aircraft determined that the odds of experiencing cabin depressurization were one in 54300 flight hours.

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