When should the anti-ice systems be turned on?

The appropriate time to activate the anti-ice systems is prior to flight into visible moisture when the total air temperature is 10°C or less. This practice is crucial because temperatures at or below this threshold, combined with moisture, significantly increase the risk of ice accumulation on critical aircraft surfaces. Ice can adversely affect aircraft performance, handling, and safety, leading to potential hazards such as loss of lift and increased drag.

Activating anti-ice systems before entering these conditions ensures that the aircraft is protected from ice formation as soon as exposure begins. This proactive approach adheres to safety protocols and aligns with recommendations from aviation regulatory authorities and aircraft manufacturers regarding ice protection systems. Overall, the timing of this action is essential for maintaining safe flight operations in adverse weather conditions.