"Moderate icing" indicates a rate of accumulation so great that even a short encounter can become hazardous. Which means for aircraft with de-icing systems, like inflatable boots, it can be difficult for the ice protection system to completely crack and remove all of the ice.Yep, we're still talking about clear ice. These large droplets tend to form a very lumpy-textured ice that can significantly disrupt the airflow and aerodynamics of the aircraft. Pilots need to know the adverse effects of icing on aircraft systems and control, as well as procedures to be adopted during icing encounters.The severity of aircraft icing depends on the rate of accumulation, effectiveness of available de-icing equipment and actions a pilot must take to avoid or combat accumulation of ice. Clouds form as the atmosphere becomes saturated with respect to liquid or ice. These orders cover safety issues ranging from crew operating procedures in the icing environment to direct design changes. Rime ice typically accretes along the stagnation line of an airfoil and is more regular in shape and conforms more to the airfoil than glaze ice. And since water weighs in at a whopping 8.3 pounds per gallon, it doesn't take long for your aircraft's weight to dramatically increase. It is described as rime, clear (sometimes called glaze), or mixed. Accreted ice can also significantly increase the weight of an aircraft.Rime ice is formed when small supercooled water droplets freeze on contact with a surface which is at a sub-zero centigrade (Celcius) temperature. Clear ice is hard, heavy, and tenadous. Rime ice forms when supercooled water liquid droplets freeze onto surfaces. The worst is the formation of "horns", which are two icy protrusions that significantly disrupt the airflow over your wings and tail.But if you do find yourself in clear ice, descending, climbing, or diverting quickly is the best course of action to keep your airplane from accumulating ice in places you'd rather not see.You can see from the picture above, that clear ice can be pretty hard to see.

Forming mostly along an airfoil's stagnation point, it generally conforms to the shape of the airfoil. This category of icing is not hazardous, and no action is normally necessary when this category is encountered for one hour or more. Clear ice happens between 0 to -20 C. Rime ice is when small super-cooled water droplets hit the surface of the aircraft freezing on impact. The amount of liquid water droplets at temperatures below freezing in any given cloud is a key factor in determining icing potential. Figure 90 illustrates ice on the cross section of an airfoil, clear ice shown at the top. We never share your info."Clear ice," on the other hand, is a more hazardous ice type, as it is denser than rime ice and can spread over a part of the airframe’s surface that is not protected by de-icing or anti-icing equipment. But it's also dangerous for another reason, and that's this:Steering clear of areas where the temps are warm, and the moisture levels are high, is the best method for staying out of harm's way when it comes to clear ice. It is dependent on a low rate of catch of small supercooled water droplets. It typically occurs with temperatures between -15° C. and -20 ° C. Rime ice has a milky, opaque appearance resulting from air trapped when it strikes the leading edge of an airfoil and freezes. And since water weighs in at a whopping 8.3 pounds per gallon, it doesn't take long for your aircraft's weight to dramatically increase.When you fly through supercooled water droplets (water droplets below 0C, but still in liquid form), they impact the surface of your plane, and then flow back, freezing into ice along the way. "Light icing" indicates that the rate of ice accumulation may create a problem if the aircraft remains in this environment for one hour or more. RIME ICE Rime ice forms when drops are small, such as Always ask your 3rd-party provider for those during a preflight briefing and keep the "big picture" in mind when operating around potential icing conditions."Trace icing" refers to a rate of ice accumulation just slightly greater than the rate of ice loss due to sublimation. It usually looks like super thick frost. And if you get clear ice forming beyond the reach of your de-ice boots, that's a very bad thing.Next up, clear ice is hard. Finally, and possibly the biggest danger, is that clear ice can form everywhere. Structural ice is the stuff that sticks to the outside of the airplane.

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