1996 53E Accident
This was a brand new aircraft on a production hover test flight. The rotating swashplate bearing ( also brand new ) overheated, failed, then as the pitch links were dragged so as to be non-vertical, the main blades followed the pitch links and the blades contacted the tail. The aircraft fell in from approx. 200 ft, but hit upright. Sikorsky crew.
Thanks,
John Dixson