Oxygen masks will automatically drop when cabin altitude reaches?

Oxygen masks will automatically drop when cabin altitude reaches?

• A. 7,000 ft
• B. 10,000 ft
• C. 13,500 ft
• D. 15,000 ft

Answer: (C)

Oxygen masks drop automatically when cabin altitude reaches a preset level to ensure passengers begin receiving oxygen as soon as pressurization is lost. The system is calibrated so this happens around thirteen and a half thousand feet, a range that provides timely oxygen without deploying too early during minor fluctuations. When the cabin altitude hits this threshold, the masks detach from their panels and the oxygen generators begin supplying air, allowing passengers to breathe normally and reducing the risk of hypoxia. Low thresholds like seven thousand or ten thousand feet would cause mask drops too readily, often during normal ascent or small pressure changes, while a much higher value would delay oxygen availability in a real decompression. The thirteen and a half thousand feet mark sits within the design window used in this context, making it the best choice for the automatic deployment trigger.

Oxygen masks drop automatically when cabin altitude reaches a preset level to ensure passengers begin receiving oxygen as soon as pressurization is lost. The system is calibrated so this happens around thirteen and a half thousand feet, a range that provides timely oxygen without deploying too early during minor fluctuations. When the cabin altitude hits this threshold, the masks detach from their panels and the oxygen generators begin supplying air, allowing passengers to breathe normally and reducing the risk of hypoxia.

Low thresholds like seven thousand or ten thousand feet would cause mask drops too readily, often during normal ascent or small pressure changes, while a much higher value would delay oxygen availability in a real decompression. The thirteen and a half thousand feet mark sits within the design window used in this context, making it the best choice for the automatic deployment trigger.