How is cabin pressurized

Reddit Pocket Flipboard Email. A Jet Airways cabin crew forgot to pressurize the cabin, resulting in passenger nosebleeds and ear pain. Getty Images The never-ending nightmare that is commercial flying just added a rather horrifying new potential mishap to its roster.

How airplanes are pressurized All airplane cabins are pressurized to simulate the amount of pressure felt at 8, feet. So what happens to your body when an airplane cabin is not pressurized? Next Up In The Goods. Delivered Fridays. Thanks for signing up! Check your inbox for a welcome email. Email required.

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Why movies tilt the camera like this By Marie Cascione. So, we're answering a few of the most common questions that arise when discussing the ins and outs of aircraft pressurization.

The answer to this first question is a little complex as it can vary across aircraft manufacturers, so let's dive in. Older piston-powered airliners used to use electric air compressors to pump outside air into the cabin of the airplane. However, this tended to add a lot of extra weight to the aircraft.

Jetliners then began to use bleed air from the engines to spin the turbo compressors, which then pumped outside air into the cabin. Today, most modern airplanes use bleed air from the engines' compressors to properly pressurize the cabin.

The engine's compressor contains a series of spinning blades that draw in fresh air from outside the plane. The air becomes extremely hot as it's compressed. It then enters the engine's combustion chamber where it combines with fuel and is burned. Then, the expanded gasses flow through the engine's turbine blades powering the compressor blades and exit the engine, creating thrust. The bleed air, which is clean, hot air, is taken from the compressor prior to mixing with any fuel or exhaust gasses.

Bleed air can help with the following:. While some of the already-hot bleed air is used for things like wing deicing, cabin-bound bleed air must be cooled first.

The cooling is conducted within an intercooler, which is a device similar to that of a car radiator. The intercooler works by shedding the heat to ambient air. The air then travels to the belly of the plane where it is cooled even further through the use of air packs, which use an air cycle machine a refrigeration unit.

This surprisingly simple air conditioner utilizes air packs to compress incoming air to heat it before sending it to an additional intercooler to dump the heat outside of the plane. This air then expands through the expansion turbine, resulting in cool air. At this point, the cooled air is ready to mix with the recirculated cabin air through the use of fans.

Automatic systems work throughout the flight to regulate the mixture of the engine's heat and the cold from the air packs. To keep the aircraft cabin pressure at a safe level, any incoming air is held within the cabin through the use of an automatic outflow valve. This valve opens and closes on a regular basis to release the incoming air at the rate regulated by pressure sensors.

Airplanes need pressurized cabins because it ensures passengers, as well as crew members, receive an adequate amount of oxygen in the air they breathe. The good news is that modern-day airplanes are designed with redundancy measures in case of pressurization failure. Passengers can place one of these oxygen masks over their face to obtain a sufficient amount of oxygen until the airplane descends and lands.

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