Which of the following is not a condition for activating wing anti-ice?

The condition "ICE is not indicated" refers to the lack of ice detection by the aircraft's systems. In order to activate wing anti-ice systems correctly, the aircraft must be in conditions where ice formation is a concern—meaning there must be visible moisture present, operating in known icing conditions, and the airspeed must be below a certain threshold.

If ice is not indicated, it suggests that the aircraft’s ice protection systems detect no risk of ice formation. Therefore, under such circumstances, there would be no need to activate the wing anti-ice system, as it is designed to prevent ice accumulation, which can negatively affect aircraft performance and safety.

In contrast, the other conditions listed, such as having visible moisture, operating in icing conditions, and maintaining an airspeed below 230 KIAS, are all factors that would typically necessitate the activation of wing anti-ice to ensure safe operation and prevent ice from forming on the wings.