What does the CHT read the temperature of?

The Cylinder Head Temperature (CHT) gauge is designed to reflect the temperature of the hottest cylinder in an aircraft engine. This measurement is crucial for engine performance and reliability, as it provides insight into how well the engine is operating and whether it is operating within its safe temperature limits.

Monitoring the hottest cylinder helps pilots and mechanics identify potential overheating, which can lead to engine damage or failure if not addressed. By focusing on the hottest cylinder, aircraft operators can take corrective actions when necessary, ensuring safety and optimal performance.

Other choices relate to different aspects of engine monitoring. The coolest cylinder or the average cylinder would not provide a complete picture of engine performance since these could mask overheating issues in other cylinders. The temperature of oil, while important for overall engine health, is a separate measurement from CHT and does not directly reflect the thermal performance of the combustion process occurring in the cylinders.