Definition
A method of removing heat from an aircraft engine by directing airflow over finned cylinders and other engine components, transferring engine heat directly into the passing air rather than through a liquid coolant.
Plain English
The engine is kept from overheating by letting outside air flow over it and carry the heat away.
Context Anchor
Seen in piston-engine aircraft discussions about engine temperature, engine design, and keeping the engine within safe operating limits.
Why Pilots Care
Most piston aircraft engines are air-cooled, which means cooling depends on airflow. During slow flight, prolonged climbs, or ground operations, airflow drops and cylinder head temperatures can rise quickly. Knowing this shapes how pilots manage power, mixture, and climb angle to keep the engine within limits.
Grounding Statement
Picture air moving over a hot engine in flight and carrying heat away from the metal surfaces.
Intuition Check
Air cooling does not mean the outside air must be cold. It means moving air is the thing that carries heat away.
Example Sentence 1
Most light aircraft use air cooling, so the pilot watches cylinder head temperature closely during a long climb when airflow over the engine is reduced.
Example Sentence 2
Higher airspeed improves air cooling during the climb.