Definition
A cockpit instrument that displays the temperature of the exhaust gases leaving the engine's cylinders, used by the pilot to lean the fuel/air mixture for efficient combustion and to monitor engine operating condition.
Plain English
A gauge that shows how hot the gases coming out of the engine are. The pilot uses this reading to adjust the mixture of fuel and air going into the engine so it runs efficiently.
Context Anchor
Seen during engine operation, especially when managing heat, leaning the mixture in cruise, or checking that the engine is running normally.
Derivation
Exhaust comes from a Latin word meaning to draw out or empty. In an engine, exhaust is the used gas drawn out after fuel burns, so exhaust gas temperature means the heat of those outgoing gases.
Why Pilots Care
It allows precise fuel mixture adjustments that improve fuel efficiency, prevent engine damage from overheating or detonation, and maintain safe engine temperatures in flight.
Intuition Check
The exhaust gas temperature gauge does not measure the temperature of the engine metal itself. It measures the heat of the gases leaving the engine after combustion.
Example Sentence 1
After leveling off at cruise altitude, the pilot leaned the mixture slowly while watching the exhaust gas temperature gauge climb to its peak.
Example Sentence 2
During the preflight run-up, the instructor pointed to the exhaust gas temperature gauge to confirm normal readings before takeoff.