Definition
The systems and devices installed in or carried aboard an aircraft to supply supplemental oxygen to pilots, crew, and passengers when flying at altitudes where the available oxygen in the surrounding air is insufficient to maintain normal body and brain function. Typical components include an oxygen storage source (usually a pressurized cylinder), a regulator that controls flow and pressure, delivery lines, and masks or cannulas worn by the user.
Plain English
The gear that gives pilots and passengers extra oxygen to breathe when flying high enough that the air alone is too thin to keep them alert and healthy.
Context Anchor
Encountered in ground training, preflight planning, and high-altitude operations when learning when oxygen is needed and how to check that it is available.
Derivation
‘Oxygen’ comes from the Greek roots oxys (sharp, acid) and genes (forming) — literally ‘acid-former,’ named in the 1700s when chemists thought oxygen was essential to forming acids. ‘Equipment’ comes from the French équiper, meaning to fit out or supply. Together: the gear that supplies oxygen.
Why Pilots Care
Prevents hypoxia, maintains pilot alertness, and satisfies regulatory requirements for flight above certain altitudes.
Grounding Statement
As an airplane climbs, each breath contains less usable oxygen, so the equipment provides extra oxygen directly to the person breathing it.
Intuition Check
Do not think of oxygen equipment as only the oxygen bottle. In aviation, it means the whole setup that stores, controls, and delivers breathable oxygen.
Example Sentence 1
Before climbing to 14,000 feet, the pilot checked the oxygen equipment to confirm the cylinder was full and the mask flowed properly.
Example Sentence 2
During the ground lesson the instructor showed how to don the oxygen equipment and confirm proper flow at simulated altitude.