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Originally posted by 727Sky
Not saying this is the case, but: Potable water and blue water from the holding tanks of aircraft have been known to leak. It is a drip or very slow leak not caught on the pre-flight inspection, or, occurs in-flight due to many factors to include; differential pressure, faulty seal at the dump station or fill receptors of the aircraft, even a valve that becomes unseated during flight..
The ice continues to grow due to subfreezing temps at altitude and normally breaks away from the aircraft on decent (warmer temps) or when the chuck of frozen stuff gets to large to maintain it's gripe on the airframe due to air resistance.
If your new found chunk of ice has a blueish tent or purple you might want to handle with protective gloves unless of course you are someone who wants to study other people's ground up poo and urine by licking your fingers......Never met one of those and hope I never do.....