Definition
The equipment installed in an aircraft to keep occupants alive and functional in flight conditions the human body cannot tolerate unaided. In aviation, this typically includes oxygen systems, cabin pressurization, and in some aircraft, anti-exposure suits or ejection-seat survival equipment.
Plain English
The gear in an aircraft that keeps the people inside alive when the air outside is too thin, too cold, or otherwise unsurvivable.
Context Anchor
Seen in discussions of high-altitude flight, pressurized aircraft, oxygen equipment, environmental control systems, and emergency procedures.
Why Pilots Care
Prevents hypoxia and decompression issues above 10,000 feet; system failure can cause rapid loss of consciousness.
Grounding Statement
At high altitude, the air outside the airplane may be too thin or too cold for people to function safely without aircraft systems helping them.
Intuition Check
Do not think of life-support systems only as hospital-style emergency equipment. In aviation, the term also includes normal aircraft systems, such as oxygen and cabin pressure systems, that keep people functioning in flight.
Example Sentence 1
Before each high-altitude flight, the crew checks the oxygen masks and other life-support systems as part of the preflight inspection.
Example Sentence 2
At 25,000 feet a cabin leak triggered the life-support systems to supply emergency oxygen to the passengers.