Flying High

Ever wonder how the FAA came up with 91.211 requiring oxygen use above 12,500 feet MSL for more than 30 minutes and any time over 14,000 feet MSL? The answer is geography, not physiology. When these rules were written, oxygen systems were expensive and heavy. General aviation wanted to fly anywhere in the U.S. without oxygen, and you can fly any mountain pass in the 48 contiguous U.S. states in less than 30 minutes between 12,500 feet and 14,000 feet MSL.

bblue

Sunday, February 17, 2019 at 12:00 AM ET

Verified

Key Takeaways:

Current FAA oxygen regulations (91.211) are based on historical equipment limitations and geography rather than individual physiological needs, which vary significantly due to factors like age, health, and home elevation.
Pilots should use a pulse oximeter to personalize oxygen use, maintaining saturation levels close to their home-field baseline, as this enhances safety, reduces fatigue, and improves cognitive function, often at altitudes lower than currently mandated.
Altitude training is crucial for understanding personal hypoxia impairment, and pilots must be vigilant about carbon monoxide (CO) as it can synergistically worsen hypoxia and falsely elevate pulse oximeter readings.