When should the wing anti-ice system be confirmed ON during takeoff after using Type IV anti-ice fluids?

The wing anti-ice system should be confirmed ON just prior to thrust increase for takeoff after using Type IV anti-ice fluids to ensure that the wings are adequately protected against ice formation during the critical phases of flight. Type IV anti-ice fluids are designed to prevent ice from adhering to the aircraft surfaces after they have been applied. However, they lose their effectiveness as time passes and the aircraft is subjected to conditions that may lead to ice accumulation, such as low temperatures or moisture present during taxiing.

Activating the wing anti-ice system just before takeoff not only ensures that the wings remain free of ice but also maximizes the effectiveness of the systems by activating them when the aircraft is about to enter a situation where ice might form. Doing so at this point allows for proper monitoring of performance and ensures that de-icing capabilities are engaged as the aircraft prepares for departure, immediately addressing any ice-related concerns. This timing helps maintain safety and performance in the initial climb, where the risk of encountering ice if not properly mitigated can increase.