Where are emergency oxygen masks located on an aircraft?

• A. In the passenger service units at each seat
• B. In the ceiling compartments in the lavatories
• C. In the crew rest compartments
• D. All of the above locations

Answer: (D)

Emergency oxygen masks are part of the aircraft’s life-support system and are placed in several accessible locations so anyone on board can get oxygen quickly during a depressurization. The most visible location is the passenger service unit above each seat, where each seated passenger can easily reach a mask. In addition, crew areas such as crew rest compartments have their own oxygen masks to keep the crew able to operate and stay safe during an emergency. Some aircraft also include oxygen masks in ceiling compartments in the lavatories, ensuring that occupants in those spaces have access to oxygen as well. By distributing masks across these multiple locations, the system makes oxygen available to passengers and crew wherever they are in the aircraft.