So, when the cabin is sealed, the interior pressure is equal to the atmospheric pressure at sea level. When the plane lands, the exterior pressure is equal to the interior pressure. So why does the plane need to be pressurised for the duration of the trip?
In: Engineering
Because people like to be able to breathe. And they especially want their pilots to be able to breathe.
As air pressure decreases, less oxygen is available to our bodies. In aviation, there is the notion of Time of useful consciousness (TUC), which his how long someone acclimated to sea level will be functional enough to operate an aircraft. As low at 10,000 feet you start to see deficits, at 15,000 you have about a half-hour, and 35,000 you have maybe 30 seconds.
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