At what cabin altitude does the oxygen mask automatically deploy?

At what cabin altitude does the oxygen mask automatically deploy?

• A. 14,000 feet
• B. 12,000 feet
• C. 16,000 feet
• D. 18,000 feet

Answer: (A)

When the pressurization system is lost, the cabin altitude begins to rise, and the oxygen system is designed to deploy automatically at about 14,000 feet of cabin altitude. This threshold is chosen because, beyond that point, the air inside the cabin would not provide sufficient oxygen for passengers, so masks drop and oxygen flow starts to maintain safe blood oxygen levels while the aircraft descends to a breathable altitude. The other given altitudes aren’t used as the trigger, since 14,000 feet is the established point to ensure timely oxygen delivery without deploying masks too early or too late.

When the pressurization system is lost, the cabin altitude begins to rise, and the oxygen system is designed to deploy automatically at about 14,000 feet of cabin altitude. This threshold is chosen because, beyond that point, the air inside the cabin would not provide sufficient oxygen for passengers, so masks drop and oxygen flow starts to maintain safe blood oxygen levels while the aircraft descends to a breathable altitude. The other given altitudes aren’t used as the trigger, since 14,000 feet is the established point to ensure timely oxygen delivery without deploying masks too early or too late.