The oxygen supply duration of passenger generators is most accurately stated as which duration in minutes?

• A. 13 minutes
• B. 7 minutes
• C. 17 minutes
• D. 29 minutes

Answer: (B)

Passenger oxygen generators are designed to provide a fixed amount of oxygen for a short, defined period after deployment. The duration comes from the amount of oxygen they can generate through the chemical reaction and the assumed flow rate. For standard passenger generators, this built-in capacity is about seven minutes. That timeframe is enough to support passengers during the critical initial phase of an emergency and to bridge to other oxygen sources or to a safe altitude. The other numbers would imply longer durations than these systems are rated to provide, so seven minutes is the best match for typical configurations. Keep in mind that tiny variations can occur with different flow settings or system designs, but seven minutes is the commonly cited rating.