At what flight level must the remaining pilot wear oxygen mask if one pilot leaves the controls?

At what flight level must the remaining pilot wear oxygen mask if one pilot leaves the controls?

• A. FL 200
• B. FL 250
• C. FL 300
• D. FL 350

Answer: (B)

When flying at high altitude, the crew must be protected against hypoxia, which can rapidly impair judgment and reaction time. If one pilot leaves the flight deck, the remaining pilot needs immediate access to oxygen to stay alert and in control while the other pilot’s situation is addressed. This protection is required at flight levels around 25,000 feet, which corresponds to FL250. Above this altitude, the oxygen mask must be worn to ensure sufficient oxygen delivery during that critical moment. The other altitude choices fall below the practical threshold where oxygen use becomes mandatory for the remaining pilot, so they’re not correct for this scenario.

When flying at high altitude, the crew must be protected against hypoxia, which can rapidly impair judgment and reaction time. If one pilot leaves the flight deck, the remaining pilot needs immediate access to oxygen to stay alert and in control while the other pilot’s situation is addressed. This protection is required at flight levels around 25,000 feet, which corresponds to FL250. Above this altitude, the oxygen mask must be worn to ensure sufficient oxygen delivery during that critical moment. The other altitude choices fall below the practical threshold where oxygen use becomes mandatory for the remaining pilot, so they’re not correct for this scenario.