Unknown Icing

This time of year in the Northern Hemisphere, airframe icing takes on much greater importance for most of us flying personal airplanes than it does at other times. There are good reasons for that, and anyone trying to conduct regular winter operations should closely monitor weather trends and plan accordingly. But the seasons wet and cold can create an icing-accident situation even on a severe-clear day with dry air. All it takes is some water and cold temperatures. The fact is, you need not encounter textbook icing conditions for the slick stuff to pose a threat when the ice hides inside the airframe, out of sight, probably out of mind but most definitively not out of the picture.

Key Takeaways:

• Aircraft are susceptible to a significant, often hidden, threat from internal icing where rainwater seeps into the airframe and freezes, even on clear days, and can affect any aircraft type.
• This internal ice can critically impair flight controls (e.g., rudder, ailerons), cause structural damage due to water expansion, create dangerous balance issues, and block vital fuel system components like lines and carburetor float bowls.
• Prevention is key, primarily by hangaring aircraft before rain or using protective covers; if encountered in flight, pilots should perform controllability checks, gently attempt to free controls, and promptly seek warmer temperatures by descending or diverting.

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