In a decompression, how long will oxygen flow once activated?

In a decompression, how long will oxygen flow once activated?

• A. 12 minutes
• B. 8 minutes
• C. 15 minutes
• D. 20 minutes

Answer: (A)

When a decompression occurs, oxygen from the passenger masks flows for a fixed period after activation to sustain you during the critical descent to a safe cabin altitude. For standard airline configurations, that duration is about 12 minutes. This length is chosen to cover the time needed for the aircraft to descend and for the cabin to reach a breathable pressure, giving you a reliable oxygen supply throughout the emergency. Duration options like 8 minutes are shorter than the typical design, while 15 or 20 minutes are longer than the standard passenger requirement (they may apply to other parts of the system or crew configurations). So, 12 minutes is the correct, typical duration.

When a decompression occurs, oxygen from the passenger masks flows for a fixed period after activation to sustain you during the critical descent to a safe cabin altitude. For standard airline configurations, that duration is about 12 minutes. This length is chosen to cover the time needed for the aircraft to descend and for the cabin to reach a breathable pressure, giving you a reliable oxygen supply throughout the emergency. Duration options like 8 minutes are shorter than the typical design, while 15 or 20 minutes are longer than the standard passenger requirement (they may apply to other parts of the system or crew configurations). So, 12 minutes is the correct, typical duration.