What is the requirement for takeoff with snow or ice present on the wings?

The requirement for takeoff with snow or ice present on the wings is that the aircraft must be de-iced and anti-iced before takeoff. This is essential to ensure that the wings are not only cleared of any snow or ice that could affect lift and control but also treated with an anti-icing fluid to prevent further accumulation during the critical phases of flight, especially during takeoff and initial climb.

When snow or ice is present, any residual contamination can significantly alter the aerodynamic characteristics of the wing, leading to reduced lift, increased drag, and potential stall conditions. Therefore, the de-icing process removes ice or snow, while anti-icing fluids provide a protective barrier to prevent new frost or ice from forming.

While other options might suggest alternative treatments, they do not meet the safety standards required for aircraft operations in those conditions. Ensuring both de-icing and anti-icing is performed creates a safe environment for takeoff, aligning with aviation safety protocols.