What are the sources of heat for a thermal anti-icing system?

The correct answer indicates that the sources of heat for a thermal anti-icing system are primarily bleed air and engine exhaust heat.

Bleed air is taken from the engine compressor stages and is a critical source of heat in many aircraft systems. This heated air can be diverted to airfoil surfaces such as wings and tail sections to prevent ice from forming or accumulating during flight. Engine exhaust heat also contributes, providing additional warmth that can be harnessed to ensure that critical components remain ice-free.

Understanding the role of bleed air and exhaust heat is essential, as they are specifically designed to maintain necessary temperatures around vital areas of the aircraft, directly influencing flight safety and performance in icy conditions.