What must you use for anti-ice when flying less than 230 KIAS with visible moisture?

Using both wings and cowls for anti-ice when flying below 230 knots indicated airspeed (KIAS) in visible moisture is crucial because it ensures comprehensive de-icing and anti-icing protection for critical surfaces of the aircraft. At lower airspeeds, the risk of ice accumulation increases, especially in conditions where moisture is present. Ice can significantly alter the aerodynamics of the aircraft, affecting lift and control surfaces, which is why it is essential to activate both wing and engine cowl anti-ice systems.

Wings are particularly vulnerable as ice can disrupt airflow over them, while engine cowl anti-ice prevents ice from forming on the engine inlets, ensuring optimal engine performance and reducing the likelihood of engine stall or failure. Together, these systems work to maintain safe operating conditions in potentially hazardous atmospheric conditions. Hence, when operating under these circumstances, it is essential to use both wings and cowls to maintain safety and performance.