Learjet flutter
Some years ago a number of Learjets broke up mysteriously in mid flight. After much investigation, the cause was found to be blocked drains in the wings. On a rainy day water would accumulate in the wing that would freeze near the training edge during climb.
Aparently this then made the Learjet susceptable to catostrophic flutter.
Question is:
1. How did the ice cause flutter?
2. How did they ever figure this out since the ice would have melted by the time the investigators arrived on scene?
Any ideas?