When should a pilot report icing conditions?

A pilot should report icing conditions primarily when encountering freezing rain, as this is a significant indicator of active icing phenomena. Freezing rain occurs when supercooled water droplets freeze upon contact with surfaces, such as the aircraft, leading to the accumulation of ice. This situation poses serious risks to flight safety, including increased weight, altered aerodynamics, and potential malfunction of aircraft systems.

While there are other scenarios where icing might be relevant, reporting during freezing rain is crucial because it directly impacts other aircraft operating in the same area. This allows for the dissemination of important information to other pilots and air traffic control, enhancing overall flight safety and operational awareness.

In contrast, temperatures above freezing, clear air, or unlimited visibility do not generally signify conditions conducive to icing, making them less critical for report purposes. Therefore, the focus on freezing rain serves to address a specific and hazardous condition that requires immediate communication.