What is the primary function of the CHT in aircraft?

The primary function of the Cylinder Head Temperature (CHT) gauge in an aircraft is to provide an indication of the average temperature of all the cylinders, which helps in assessing the overall performance and efficiency of the engine. Monitoring cylinder head temperatures is crucial for engine management, as it ensures that the engine is operating within safe temperature limits and helps prevent damage due to overheating.

Understanding that the CHT measures the average temperature is key because it allows pilots to identify potential issues with individual cylinders. If one cylinder is significantly hotter or cooler than the others, it may indicate a problem that needs attention, such as an ignition or fuel issue. Therefore, while it seems logical that the gauge would focus on the hottest cylinder, it actually provides a broader view of the engine’s thermal conditions.

Using the right measurement allows for a more comprehensive insight into the engine's operational health, which is vital for safe flying practices.