What does the On-board Oxygen Generation System (OBOGS) consist of?

• A. A series of lines, valves and a concentrator that regulate pressure, control flow and distribute oxygen to the crew station
• B. A set of bottled oxygen containers
• C. A portable oxygen mask
• D. A solar-powered oxygen generator

Answer: (A)

The system is built around concentrating ambient air onboard to provide breathable oxygen, then delivering it to the crew through a dedicated distribution network. The heart of this setup is the concentrator, which removes nitrogen from the incoming air to create oxygen-rich gas. That oxygen then travels through a series of lines and valves that regulate pressure and control flow, routing it to the crew station masks. This combination of a concentrator with a controlled distribution path is exactly what makes OBOGS work on the aircraft, providing a continuous, onboard supply of breathable oxygen without heavy bottles.

Bottled oxygen containers aren’t part of this onboard generation system, though they can serve as backups. A portable oxygen mask is simply a mask component, not the generation and distribution system. A solar-powered oxygen generator isn’t used in this aircraft context.