ORIGINAL: navihawk
I think that what happened was that the main shaft retaining collar became loose and allowed the main shaft and gear to go down and up.
I found that same situation on a post flight this afternoon (hard landing) inspection. I had about an 1/8 inch play. The evening flight (attempt)
was not too good either but re-checked the blade tracking and everything else and Tomorrow I will try and "keep the tail"
Bob
dignlivn