At what altitude is supplemental oxygen required to be provided to each occupant?

Supplemental oxygen is mandated for each occupant when flying at or above 15,000 feet. This requirement is established based on physiological factors, as the partial pressure of oxygen decreases with altitude, leading to a higher likelihood of hypoxia, or oxygen deficiency, which can impair cognitive function and overall performance.

At altitudes above 15,000 feet, the ambient air pressure is significantly lower, and the concentration of oxygen available to breathe is insufficient for normal bodily functions, even for short durations. Providing supplemental oxygen helps mitigate the risks associated with reduced oxygen levels, ensuring that all occupants can maintain optimal cognitive and physical performance during flight.

While there are regulations concerning the use of oxygen at lower altitudes (such as at 12,500 feet where supplemental oxygen is required for flights longer than 30 minutes), the specific requirement for providing oxygen to each individual occupant kicks in at 15,000 feet, making it crucial for safety when operating in higher altitudes.