Which statement correctly lists the minimum oxygen quantities for three crew members and two crew members, respectively?

• A. 1110 PSI for 3 crew and 960 PSI for 2 crew
• B. 960 PSI for 3 crew and 1110 PSI for 2 crew
• C. 1100 PSI for 3 crew and 950 PSI for 2 crew
• D. 1000 PSI for 3 crew and 900 PSI for 2 crew

Answer: (A)

The main idea is that oxygen supply must cover the number of people breathing from it. More crew means more total consumption, so the minimum required pressure should be higher when there are three people than when there are two. The standard reference values used in this context set 1110 psi as the minimum for three crew and 960 psi for two crew, providing a safe breathing duration with a margin for delays or heavier-than-average breathing. The other numbers don’t match that established pairing, and one option even reverses the relationship, which wouldn’t make sense for planning. So the correct pairing is 1110 psi for three crew and 960 psi for two crew.