FAR 91.211: How Long Can You Fly Without Oxygen?

FAR 91.211: How Long Can You Fly Without Oxygen?

Ask how long a pilot can fly without oxygen and you get two answers that do not resemble each other. The legal answer lives in 14 CFR 91.211, and at 12,000 feet it is remarkably relaxed: fly all day. The physiological answer comes from the FAA’s own aeromedical...