What is the minimum requirement for oxygen use above 12,500 feet?

The choice stating that pilots must use supplemental oxygen above 12,500 feet after 30 minutes is correct because it aligns with regulations established by the Federal Aviation Administration (FAA) regarding oxygen use at altitude. According to these regulations, pilots flying at altitudes between 12,500 and 14,000 feet must use supplemental oxygen if they are flying for more than 30 minutes. This requirement is based on the physiological effects of altitude on the body, particularly the lower partial pressure of oxygen as altitude increases, which can lead to hypoxia—a condition that can impair cognitive and physical performance.

At altitudes above 14,000 feet, the need for supplemental oxygen changes. Pilots are required to use oxygen continuously when above this altitude to prevent the dangers associated with altitude-related hypoxia. Understanding these guidelines is crucial for maintaining safety during flight operations, especially when operating at higher altitudes where atmospheric pressure decreases and oxygen levels become insufficient to support normal physiological functions without supplemental oxygen.