What is the flow rate duration of chemically generated oxygen in the cabin?

• A. 5–10 minutes
• B. 10–12 minutes
• C. 12–15 minutes
• D. 15–20 minutes

Answer: (C)

The flow rate duration of chemically generated oxygen in the cabin is typically around 12–15 minutes. This duration is a critical standard that ensures passengers have enough oxygen during an emergency situation, such as cabin decompression, where the atmosphere becomes insufficient for breathing.

Chemically generated oxygen systems, commonly found in aircraft, operate by a chemical reaction that generates oxygen when activated. The duration of 12–15 minutes is based on the average time needed to provide safe breathing until the aircraft descends to a safer altitude or until another form of oxygen can be provided. This time frame is particularly designed to allow for adequate time for evacuation or stabilization, making it a crucial safety consideration in aviation operations.