What is the primary purpose of the Portable Oxygen System (PBE) or portable oxygen system?

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The main idea is to provide breathable oxygen to reduce smoke inhalation. In a smoke-filled cabin, breathing clean oxygen helps crew stay conscious and able to act quickly to evacuate safely. The system delivers oxygen through a mask, ensuring a reliable supply even when the surrounding air is contaminated. It isn’t intended to detect smoke, power emergency lights, or inflate life rafts—those tasks belong to other safety systems. The Portable Oxygen System is carried for fast access and activated to supply oxygen when needed.