At what altitude do pilots require oxygen for durations exceeding 30 minutes?

The requirement for supplemental oxygen for pilots flying at altitudes above certain thresholds comes from regulations aimed at ensuring safety and minimizing the risk of hypoxia, which can impair cognitive and physical performance.

For flights at altitudes between 12,500 feet and 14,000 feet MSL, pilots are indeed required to use supplemental oxygen if they are flying for more than 30 minutes. This rule acknowledges that above 12,500 feet, the partial pressure of oxygen decreases significantly, which can affect a pilot's ability to function well over time, even at these relatively moderate altitudes.

Once the altitude exceeds 14,000 feet, the regulations become stricter, requiring pilots to use supplemental oxygen continuously. Therefore, understanding the correct altitude range for the 30-minute requirement is essential for proper flight planning and safety practices during flight operations.