Plain English Meaning
A small, carry-on oxygen kit you bring into the aircraft. It includes a bottle of oxygen, a knob or valve to control the flow, and a mask or nose tube to breathe through.
Full Definition
A self-contained, transportable oxygen supply system consisting of a small high-pressure cylinder, a regulator, and a mask or cannula, used to provide supplemental oxygen to pilots and passengers in aircraft not equipped with a built-in oxygen system or as a backup to such a system.
Context Anchor
Seen in high-altitude flight planning, aircraft equipment checks, and discussions of oxygen use in the Pilot’s of .