What heating method is often used in pitot-static tubes to prevent icing?

The use of electrical heating in pitot-static tubes is a common method employed to prevent icing. This heating method works by generating warmth that prevents the formation of ice on the surface of the pitot tube, which is critical for maintaining accurate airspeed and altitude readings. Icing can significantly disrupt the performance and accuracy of these instruments, leading to potential safety hazards during flight.

Electrical heating is particularly effective because it can be precisely controlled and is often integrated into the design of the pitot-static system, ensuring that heat is applied consistently where needed. This method allows for real-time management of the heating as conditions change, responding quickly to temperature shifts that could lead to icing.

Other methods such as hot air from the engines, while useful in some systems, may not be as reliable or efficient in the context of pitot-static tubes. Additionally, chemical de-icers and radiant heating are less common and might not provide the same level of thorough and direct heating required to combat ice in these specific instruments.