Refer to figures.
Freezing Rain occurs when precipitation, in the form of rain, passes from a warm air mass into a relative cold air mass of an air temperature less than 0°C. The rain maintaining its liquid state in sub-zero temperatures renders it super-cooled. It can cause significant accumulations of Clear Ice.

Clear ice is the most hazardous form of airframe icing, because it has the fastest rate of accumulation and is more difficult to remove than rime ice. When the supercooled drop hits the airframe, it freezes relatively slowly due to the latent heat released in the freezing process. This allows part of the drop to spread backwards before it too freezes.

• The fact that the supercooled drops spread back before freezing is especially dangerous because there is the risk of accretion of ice aft of the ice-protection equipment.