Definition
The aircraft system or portable equipment that stores and delivers breathable oxygen to pilots, crew, and passengers when ambient air at altitude no longer contains enough oxygen to maintain normal physiological function. An oxygen supply typically consists of a storage source (compressed gas cylinders, liquid oxygen, or chemical generators), pressure regulators, delivery lines, and masks or cannulas used by the occupants.
Plain English
The bottled or stored oxygen on board the aircraft, along with the hoses, regulators, and masks needed to breathe it when the air outside is too thin.
Context Anchor
Used in preflight planning and cockpit checks for flights where supplemental oxygen may be needed or required.
Why Pilots Care
Inadequate oxygen supply causes hypoxia, impairing judgment and risking unconsciousness above 10,000 feet.
Grounding Statement
As altitude increases, each breath contains less usable oxygen, so the aircraft may need to carry extra oxygen for the people on board.
Intuition Check
Oxygen supply does not just mean that an oxygen bottle is installed. It means there is enough usable oxygen available for the people who need it during the planned flight.
Example Sentence 1
Before the high-altitude cross-country, the pilot checked the oxygen supply pressure gauge and confirmed each mask flowed correctly.
Example Sentence 2
During the rapid climb through 12,000 feet, the crew donned masks to use the aircraft oxygen supply.