Definition
A condition in which the temperature of one or more engine cylinders rises above the manufacturer's recommended operating limits, typically caused by prolonged ground operation, extended climbs at low airspeed, lean fuel mixtures, or inadequate cooling airflow. Sustained cylinder overheating can lead to detonation, preignition, loss of power, and progressive engine damage including warped valves, scored cylinder walls, and cracked cylinder heads.
Plain English
When the cylinders inside the engine get hotter than they're supposed to, usually because the engine isn't getting enough cooling air or because the fuel mixture is too lean. If it keeps happening, parts of the engine can be damaged.
Context Anchor
Encountered during engine checks, before-takeoff checks, long ground operations, climb, or any situation where engine temperature is being monitored.
Derivation
Cylinder comes from an old word meaning a roller or round shape. In an aircraft piston engine, the cylinder is the round chamber where the piston moves and fuel burns. Overheating simply means heating beyond a safe amount, so cylinder overheating means that engine chamber has become too hot.
Why Pilots Care
Overheating can warp cylinder heads, cause power loss, or lead to engine failure on or shortly after takeoff.
Grounding Statement
Heat can build quickly when the engine is making power but not getting enough cooling air, such as during a long taxi or slow climb on a hot day.
Intuition Check
Cylinder overheating does not mean the whole engine must be visibly smoking or failing. It can mean one cylinder is above its safe temperature limit even while the engine still seems to be running normally.
Example Sentence 1
After a long taxi on a hot summer afternoon, the pilot kept the run-up brief to avoid cylinder overheating before takeoff.
Example Sentence 2
If cylinder overheating appears on the number two cylinder after takeoff, the pilot reduces power and increases airspeed to restore proper cooling.