So, if you had 29.92 inches of pressure in your lungs, and oxygen makes up 21% of the air, oxygen's partial pressure is. The partial pressure of oxygen is the amount of the air pressure in your lungs that's made up of oxygen. To solve this problem, you need to keep the "partial pressure" of oxygen at a safe level. But, at 18,000 feet, the atmospheric pressure is half that of sea-level.Īs you climb and decrease blood-oxygen, you'll eventually get hypoxic, pass out, and drone off unconscious until you run out of gas. The percentage of oxygen in the air doesn't change - it's still 21 percent. Your Lungs - It's All About PressureĪfter you inhale air into your lungs, atmospheric pressure forces oxygen through your lungs' membranes and into your bloodstream.Īs you climb, atmospheric pressure decreases, and the amount of oxygen forced into your blood also decreases. Neither is much use in general aviation.īut, before you get into masks, you should understand what they're trying to do. When you think of an oxygen mask, you probably either think of the thing hanging around a fighter pilot's neck, or one of those little yellow dixie cups that drop from the overhead panels of an airliner. What Kind Of Supplemental Oxygen System Should You Use? Above 15,000 feet MSL, you have to provide it to your passengers - and many aviation attorneys would suggest you make them use it. ![]() As a crew member, you must use supplemental oxygen when you're above 12,500 feet MSL cabin pressure altitude for more than 30 minutes, and anytime you're above 14,000 feet MSL. ![]() You probably know the oxygen rules by heart. Here's a simple rundown of what you can use and how they work. But few learn about the different types of oxygen systems. Every pilot learns about supplemental oxygen rules - even if you train in a Piper J3 Cub, which tops out around 11,500 feet.
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