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:

The FAA's oxygen regulations (91.211) are based on outdated geographic and economic factors rather than individual physiological needs, meaning many pilots may require oxygen at lower altitudes than legally mandated.
Pilots should use a pulse oximeter to accurately assess their personal oxygen saturation levels, as individual needs vary significantly based on factors like health, age, and home elevation.
Liberal oxygen use, even when not legally required, can reduce fatigue, improve cognitive function and vision, and alleviate symptoms for passengers; pilots should also ensure efficient delivery and be prepared for emergency oxygen use.