How long can you free fall in a plane?

While your freefall time will vary, you can expect to fall for this long depending on your exit altitude: 9,000 ft: approximately 30 seconds in freefall. 14,000 ft: approximately 60 seconds in freefall. 18,000 ft: approximately 90 seconds in freefall.



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For starters, you wouldn't have much time. If you fall from a plane at 12,000 feet (about 2 miles or 3.6 kilometers up), you'll have less than a minute before you hit the ground. That's because in freefall, you plummet at about 120 miles per hour (193 kilometers per hour).

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At 40,000 feet its only 2.72 PSI. If outside air gets into the mask and is breathed, it contains one-fifth (20 percent) of the oxygen necessary for survival at 40,000 feet. The time of useful consciousness on ambient air only at 40,000 feet is 15 to 20 seconds.

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Indeed, HALO experiences can also be done as civilian jumps -- but, since they're extraordinary skydives with very specific equipment and permissions requirements, they're performed with far less frequency. Here's what you need to know!

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Although people do survive, your chances aren't very good, Hamilton says, so it's better to avoid the situation entirely. In the end, the best way to survive a tumble out of an airplane may be to wear a parachute.

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And so initially, when we hit the ground with our foot, this spring compresses and so the force increases quite a bit, and we have the first force hump. And then we have a rebound. So the spring relaxes again, our whole body moves up and we fall back into the spring.

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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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