What is the official oxygen duration rating for passenger oxygen generators?

What is the official oxygen duration rating for passenger oxygen generators?

• A. 13 minutes
• B. 4 minutes
• C. 9 minutes
• D. 18 minutes

Answer: (B)

The key idea is how long a passenger oxygen generator can produce oxygen after it’s activated. The official oxygen duration rating for passenger oxygen generators is four minutes. This defined duration is set so the system provides a reliable, quick oxygen supply during the immediate emergency as the aircraft begins its descent to a breathable altitude. It reflects how the system is certified and used in practice—not intended to be a long-term oxygen source, but a brief, immediate aid while other safety steps are carried out. Longer durations listed in the other options would not match the standard specification for this gear.

The key idea is how long a passenger oxygen generator can produce oxygen after it’s activated. The official oxygen duration rating for passenger oxygen generators is four minutes. This defined duration is set so the system provides a reliable, quick oxygen supply during the immediate emergency as the aircraft begins its descent to a breathable altitude. It reflects how the system is certified and used in practice—not intended to be a long-term oxygen source, but a brief, immediate aid while other safety steps are carried out. Longer durations listed in the other options would not match the standard specification for this gear.