Why is clear icing considered particularly hazardous?

Clear icing is considered particularly hazardous because it is difficult to detect and it alters the shape of the airfoil. Unlike other types of icing, clear ice forms a smooth, transparent layer that closely conforms to the shape of the wing. This can make it challenging for pilots and crew to visually assess the presence of ice on the aircraft, especially in conditions where ice is forming.

The modification of the airfoil's shape affects the aerodynamic properties of the aircraft, leading to increased drag and reduced lift. This change can result in a dangerous decline in aircraft performance, including stalls or loss of control, making understanding and recognizing the dangers of clear icing vital for aviation safety.

Clear icing is not solely associated with high altitudes, nor is it accurate to say it does not accumulate on the wing; in fact, it can be particularly insidious in its accumulation. Additionally, clear ice tends to persist on surfaces even without immediate noticeable effects, which can mislead pilots regarding the aircraft's airworthiness. Hence, the inherent risks posed by clear ice are primarily due to its stealthy formation and the critical impact it has on airflow and lift.