Federal Aviation Regulations Practice Test 2025 – Complete Exam Prep

Question: 1 / 400

Under FARs, when is a pilot required to use supplemental oxygen?

When flying above 10,000 feet for more than 30 minutes

When flying above 12,500 feet for more than 30 minutes

A pilot is required to use supplemental oxygen when flying above 12,500 feet for more than 30 minutes due to the physiological effects of altitude on the body. At altitudes above this threshold, the partial pressure of oxygen decreases, which can impair cognitive function and physical performance. This regulation is in place to ensure that pilots maintain adequate oxygen levels to manage the aircraft safely.

While options like flying at 10,000 feet for more than 30 minutes and flying above 15,000 feet for any duration may seem reasonable, they do not align with the specific requirements set by the Federal Aviation Regulations. Specifically, the regulation mandates the use of supplemental oxygen at 12,500 feet to ensure a safety buffer against hypoxia, which is critical for pilots operating in high-altitude environments.

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When flying above 15,000 feet for any duration

Whenever experiencing altitude sickness

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