The only time ice on the air-frame is a good thing is when it's tied down and you really didn't want to go flying today, anyway. Otherwise, it's always something to be avoided. As we all should have been taught, ice adhering to the wings, tail and other components tends to add weight and drag. If it forms on an airfoil, the surface's lift characteristics can be dramatically different, in addition to the weight and drag. Bad karma all around. But ice can affect other systems, too. The pitot/static system is problematic, as is the electrical system, as more current is demanded to keep things warm.
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