Where do oxygen masks deploy from during depressurisation?

Where do oxygen masks deploy from during depressurisation?

• A. PSU
• B. Overhead bin
• C. Under seat pocket
• D. Cockpit

Answer: (A)

Oxygen masks for passengers are stored in the Passenger Service Unit above each seat. When depressurization occurs, the PSU doors release and the masks drop down for passengers to grab and put on. The oxygen is supplied by chemical generators activated when the mask is pulled, typically providing several minutes of breathable air to allow the aircraft to descend to a safe altitude. The cockpit has its own separate oxygen supply, but the passenger masks come from the PSU, not from an overhead bin or under-seat pocket.

Oxygen masks for passengers are stored in the Passenger Service Unit above each seat. When depressurization occurs, the PSU doors release and the masks drop down for passengers to grab and put on. The oxygen is supplied by chemical generators activated when the mask is pulled, typically providing several minutes of breathable air to allow the aircraft to descend to a safe altitude. The cockpit has its own separate oxygen supply, but the passenger masks come from the PSU, not from an overhead bin or under-seat pocket.