What is the immediate action required if the ICE DETECTED CAS message is presented during flight?

When the ICE DETECTED CAS message appears during flight, the immediate action mandated is to engage the wing anti-ice system. This message indicates that the aircraft's systems have detected icing conditions which could compromise the performance and safety of the aircraft. Activating the wing anti-ice system is essential because it helps to prevent ice buildup on the wings and ensures that the critical aerodynamic properties of the aircraft are maintained.

While other options may appear relevant, engaging the wing anti-ice system directly addresses the concern of ice accumulation, which is the primary issue indicated by the CAS message. The wing anti-ice system works by heating the leading edges of the wings, which is crucial for flight safety in icy conditions.