What is the main purpose of using bleed air in thermal anti-icing systems?

The main purpose of using bleed air in thermal anti-icing systems is to provide heated air for de-icing applications. In various aircraft systems, bleed air—air that is bled from the engine compressor stage—is utilized to ensure that critical components such as wings, tail surfaces, and engine inlets remain free from ice buildup.

When bleed air is routed into the thermal anti-icing system, it is heated by the engine before being directed to areas at risk of ice formation. This heated air effectively prevents ice from forming on surfaces that could interfere with aerodynamic performance, reduce lift, or potentially obstruct airflow to engines.

Utilizing bleed air in this way is crucial for maintaining safety and performance in various weather conditions. It is a common practice in aviation design to incorporate such systems as ice can pose serious risks, especially during takeoff and landing phases. The other options describe different functions but do not relate directly to the primary aim of thermal anti-icing systems in aviation, which centers around the prevention of ice buildup.