Which condition requires caution when operating the Wing Anti-ice system?

When operating the Wing Anti-ice system, caution is particularly required during ground operations and takeoff. This is primarily because the system is designed to prevent ice accumulation on the wings by heating the leading edges. During takeoff, if ice forms on the wing, it can severely affect the aircraft's performance and safety.

In this phase of flight, particularly on the ground, the application of the anti-ice system must be managed carefully to ensure it functions correctly without causing any unintended effects, such as affecting the aerodynamic surfaces prematurely or introducing additional variables in the takeoff parameters.

While operating the system during clear weather conditions, during maintenance checks, or when temperatures are above freezing may bring different considerations, those scenarios do not typically present the same immediate operational risks that are present during takeoff. Thus, understanding the implications of using the Wing Anti-ice system in the context of ground operations is crucial for safe flight practices.