Definition
A heat exchanger used in liquid-cooled aircraft engines that transfers heat from circulating engine coolant to the surrounding airflow, maintaining engine operating temperature within safe limits.
Plain English
A part that cools the engine by passing hot liquid through a network of small tubes and fins, where outside air flowing over them carries the heat away.
Context Anchor
Seen in weather and flight-environment discussions about how the ground and other surfaces heat or cool the air around an airplane.
Derivation
From Latin 'radiare,' meaning to emit rays or give off. The name reflects how the device sheds heat outward into the surrounding air.
Why Pilots Care
Keeps engine temperatures within limits, preventing power loss or damage from overheating.
Analogy
A driveway that stays warm after sunset is acting like a radiator. It absorbed heat during the day and then gives some of that heat back to the air.
Grounding Statement
After a sunny day, a dark runway can give heat back into the air above it even after the sun is lower in the sky.
Intuition Check
Do not assume radiator means only the cooling part in a car or airplane engine. Here, a radiator is anything in the environment that gives off heat or energy.
Example Sentence 1
During preflight, the pilot checked the radiator inlet for bugs, leaves, and other debris that could restrict airflow.
Example Sentence 2
In the climb, reduced airspeed through the radiator caused cylinder head temperature to rise.