Has a plane ever lost cabin pressure?

— One of the most well-known crashes involving hypoxia was the 1999 crash of a Learjet that lost cabin pressure and flew halfway across the country on autopilot before running out of gas and crashing in a South Dakota pasture, killing professional golfer Payne Stewart and five others.



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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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For operations conducted under Parts 121 and 135, the flight crew must use oxygen when cabin altitudes are above 10,000 up to 12,000 feet after 30 minutes and at all times when above 12,000 feet. The general aviation pilot flying an unpressurized airplane will not normally operate above 25,000 feet.

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As stated in other answers, in steady flight there is no pressure difference along the length of the cabin, and only a miniscule one during lognitudinal acceleration.

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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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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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When an aircraft experiences turbulence, the plane can drop or change altitude suddenly. This is why pilots always caution passengers to buckle up and stay seated when they are experiencing flight turbulence. The sudden movements put passengers at risk.

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In some cases, such as the “Miracle on the Hudson”, the aircraft is ditched without major damage and it may actually float for some time. Eventually, all of them will sink. A “crash” implies an uncontrolled landing in which the aircraft is significantly damaged and will quickly sink.

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In today's aircraft, the passenger oxygen masks are armed to automatically deploy if the cabin pressure exceeds a certain threshold (about 14,000 ft). So, in a depressurization event, when the cabin altitude goes above the threshold, the masks fall from their compartments.

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When the altitude of an airplane is less than 12,500 feet, there is no supplemental oxygen required for anyone in a private plane. From 12,500 feet to 14,000 feet, supplemental oxygen must be used by the required flight crew for any portion of the flight that is more than 30 minutes.

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Your chances of being involved in a fatal plane crash are incredibly small – around 1 in 11 million, according to Harvard researchers. While your odds of being in a plane accident are about 1 in 1.2 million, survivability rates are about 95.7% – so the odds are with you no matter how you look at it.

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The inner pane basically safeguards the load from the passengers during flight. When both the outer and middle panes break, then all the pressurization in the airplane would escape leading to decompression in the passenger cabin. A plane is pressurized for passengers' comfort as it climbs to a higher altitude.

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Do pilots hear the flight attendant announcements? Yes… any announcements made to the passenger cabin, are also heard in the cockpit, and vice-versa. If the cabin crew wishes to speak to the cockpit crew only, they use the phones by the jumpseats or in the galley.

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Many airlines provide crew rest areas on their aircraft, where pilots can sleep during long-haul flights. These areas are usually located in the tail, cargo area or above the cabin of the plane and are designed to be as quiet and comfortable as possible. Other crew members prefer to use business class seats to rest.

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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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