The fixed cabin oxygen system is designed to automatically drop the oxygen masks at what cabin altitude?

The fixed cabin oxygen system is designed to automatically drop the oxygen masks at what cabin altitude?

• A. 10,000 ft
• B. 14,000 ft
• C. 18,000 ft
• D. 22,000 ft

Answer: (B)

The fixed cabin oxygen system is designed to provide immediate oxygen to passengers as soon as the cabin environment becomes insufficient for safe breathing. That trigger point is when cabin altitude reaches 14,000 feet. At normal cruise, the cabin is held around 6,000–8,000 feet, so masks stay stowed, but if a decompression occurs and the cabin climbs to 14,000 feet, the masks automatically deploy to ensure passengers have breathable oxygen. The other altitude options are outside the standard deployment threshold, either occurring too early or too late to keep everyone safe, making 14,000 feet the correct design point.

The fixed cabin oxygen system is designed to provide immediate oxygen to passengers as soon as the cabin environment becomes insufficient for safe breathing. That trigger point is when cabin altitude reaches 14,000 feet. At normal cruise, the cabin is held around 6,000–8,000 feet, so masks stay stowed, but if a decompression occurs and the cabin climbs to 14,000 feet, the masks automatically deploy to ensure passengers have breathable oxygen. The other altitude options are outside the standard deployment threshold, either occurring too early or too late to keep everyone safe, making 14,000 feet the correct design point.