Above what altitude must the pilot don their mask if the other crew member leaves?

• A. FL180
• B. FL250
• C. FL320
• D. FL400

Answer: (B)

When a second crew member leaves the cockpit, the remaining pilot must have an immediate and reliable oxygen supply to prevent hypoxia and maintain safe control of the aircraft. Above a certain altitude, the risk of hypoxia increases quickly, so donning an oxygen mask becomes mandatory. In this GoJet scenario, the required threshold is flight level 250 (25,000 feet). At or above this altitude, the pilot should put on the mask to ensure continuous oxygen and preserve decision-making ability while the other crew member is away. The other altitude options do not reflect this SOP threshold.