I've read several involving R22/R44 - eg Steve Hislop
INQUIRY UNDER THE FATAL ACCIDENTS AND SUDDEN DEATHS (SCOTLAND) ACT 1975 INTO THE SUDDEN DEATH OF ROBERT STEVEN HISLOP v. , 30 May 2008, Sheriff Principal E.F. Bowen
Now this may be due to the popularity of these helicopters with private users, or is it to do with the inherent limitations of the Robinson rotor system?