How high can you fly without pressure?

The higher the maximum differential pressure, the closer to sea level the system can maintain the cabin. Federal Aviation Regulations say that without pressurization, pilots begin to need oxygen when they fly above 12,500 feet for more than 30 minutes, and passengers have to use it continuously above 15,000.



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Some business jets can soar up to 15,000 meters, while most military aircraft can fly at this altitude or even a little higher. However, these aircraft tend to stay below 15,000 feet for safety reasons, as the air can become too thin and make it impossible to burn aviation fuel continuously.

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Aerodynamic altitude: If a commercial airliner flies too high, it will encounter less dense air passing over the wings to create lift. This can cause the plane to stall and fall out of control. Depending on the weather conditions and aircraft weight, this can occur anywhere between 40,000 and 45,000 feet.

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The most common causes of hypoxia in aviation are: flying, non-pressurized aircraft above 10,000 ft without supplemental oxygen, rapid decompression during flight, pressurization system malfunction, or oxygen system malfunction.

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This valve controls the cabin pressure and also acts as a safety relief valve, in addition to other safety relief valves. If the automatic pressure controllers fail, the pilot can manually control the cabin pressure valve, according to the backup emergency procedure checklist.

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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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If oxygen deficiency continues over a long enough period of time, it can cause unconsciousness, permanent brain damage or even death. So, in order to keep everyone maintained with enough oxygen, the masks fall down and provide a personal flow.

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For a person who has been exposed to hypoxia for a long time, the situation can be very serious. Therefore, patients with heart, lung and respiratory diseases should consult their doctor before flying.

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Distract yourself. There may be magazines on the flight, or you can download audiobooks or music to your phone. Having something to occupy your time during the flight can help you forget you're in an uncomfortable situation. Making yourself as comfortable as possible will make the flight easier for you.

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