What can potentially happen if the leading edges are not properly treated?

If the leading edges of an aircraft are not properly treated during de-icing procedures, there is an increased risk of ice accumulation. The leading edges are crucial areas where ice tends to form due to the airfoil's design and the airflow dynamics around the aircraft. If these surfaces are inadequately treated, they may not achieve the necessary temperature or surface conditions to prevent ice from forming.

Ice accumulation on leading edges can significantly impair an aircraft's aerodynamic performance by altering lift and drag characteristics, which can lead to dangerous flight conditions. This is particularly critical during takeoff, landing, and in-flight maneuvers, where maintaining appropriate control over the aircraft is vital for safety. Consequently, ensuring that leading edges are thoroughly de-iced is essential for both performance and safety.