What does the "prop heat" refer to in de-icing systems?

The correct interpretation of "prop heat" in de-icing systems is that it refers to a hot air system designed to prevent ice accumulation on the propeller blades. Ice can form on propellers during flight, especially in conditions where moisture is present in cold temperatures, which can severely impact performance and efficiency.

The hot air is typically routed from the engine, where it is heated, and then directed to the propeller areas. This heat raises the temperature of the propeller blades enough to melt any ice that may have formed and to prevent additional ice from accumulating during operations. This function is crucial in maintaining safe flight characteristics and ensuring that the aircraft can operate effectively in conditions where icing is a concern.

Understanding the de-icing process is vital for pilots to ensure they are prepared for adverse weather conditions that could affect their flight safety and aircraft performance.