What is a significant impact of icing on aircraft?

The significant impact of icing on aircraft is that it leads to a distorted airfoil. Ice accumulation on an aircraft's wings and control surfaces alters the shape of these components, which disrupts the airflow over them. This distortion can affect the lift, drag, and control characteristics of the aircraft.

When ice forms, it changes the smooth contours needed for optimal aerodynamic performance, typically resulting in a higher stall speed, reduced lift, and potentially making it difficult for the pilot to maintain control during flight. This impact is critical, as even a small amount of ice can significantly impair an aircraft's ability to fly safely.

Other options, although related to the effects of icing, do not represent the primary impact as distinctly as the distortion of the airfoil does. Understanding the aerodynamic changes caused by icing is crucial for pilots and engineers in ensuring safety and performance in icy conditions.