Extreme-Altitude Hazards

Most of my flying career was spent with an oxygen mask either five seconds away, or with it on and breathing 100-percent oxygen. After many sessions of lectures, altitude chambers and flight missions, oxygen education became a kind of gray thing. While the essentials stayed in the back of my mind, the details faded. That is, until my best friend died at the hands of the hypoxia monster. I learned and re-learned a lot during those next few weeks. One of the things I learned (or re-learned) is just how hostile is the high-altitude environment when were not prepared for it. Often, unfortunately, even if we are prepared, it can still rear up and bite us. Of course, the big problem with high-altitude flight operations is it can be a long way down to a safer level, where the air is denser. As well discover, an inability to breathe without some kind of assistance is just one of the problems.

Key Takeaways:

• High-altitude flight poses severe hypoxia risks, requiring strict adherence to FAA oxygen regulations that escalate with altitude, progressing from cannulas to masks and constant-flow systems.
• Above 25,000 feet, specialized pressure-demand oxygen systems are critical, as 100% oxygen under positive pressure is absolutely necessary beyond 40,000 feet due to extremely short times of useful consciousness.
• For unpressurized flight at very high altitudes (especially above FL250), pilots must use pressure settings on their regulators to prevent dangerous ambient air leaks, consider backup systems, monitor blood oxygen with a pulse oximeter, and be aware of equipment icing hazards.

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