What is the primary difference between de-icing and anti-icing?

The primary difference between de-icing and anti-icing lies in their specific functions and timing of use. De-icing refers to the process of removing ice or snow that has already formed on an aircraft's surfaces, such as wings and tail, before takeoff. It is a reactive measure taken when ice or frost is already present, ensuring that the aircraft is safe for flight.

On the other hand, anti-icing involves applying a substance that prevents the formation of ice in the first place. This proactive approach is used when conditions are conducive to ice accumulation, and it serves to inhibit ice growth to maintain aircraft performance and safety.

Recognizing this distinction is critical for effective winter operations, as using de-icing incorrectly in place of anti-icing, or vice versa, could lead to unsafe flying conditions. Knowing when to apply each procedure based on weather conditions and existing ice is essential for pilots and ground crew.