At what altitude range is supplemental oxygen required for flight crew?

Supplemental oxygen is required for flight crew when flying at altitudes of 12,500 feet to 14,000 feet, specifically for flights lasting more than 30 minutes. At these altitudes, the partial pressure of oxygen begins to decrease significantly, which can lead to hypoxia, a condition where the body does not receive enough oxygen.

This requirement is grounded in the physiological effects of altitude on the human body and the need to ensure the safety and performance of the flight crew. Pilots and crew operating in this altitude range must be equipped with supplemental oxygen to maintain cognitive function and physical performance, especially in the event of an unforeseen situation.

Further, at altitudes above 14,000 feet, the regulations stipulate stricter requirements for oxygen use. For instance, at altitudes of 15,000 feet or higher, supplemental oxygen must be provided to each crew member regardless of flight duration. Above 18,000 feet, the cabin altitude must also be maintained at a level that ensures adequate oxygen supply for both crew and passengers, in accordance with federal aviation regulations.

Understanding these requirements is crucial for maintaining safety and compliance during flight operations.