News story
AAIB report: Robinson R22 Beta helicopter, rolled over during precautionary landing
Robinson R22 Beta helicopter (G-OODX) accident during private flight, Worcestershire
During a private flight to Worcester, drive was lost to the main rotor. The pilot established the helicopter in autorotation but as he flared for landing the tail struck the ground and the helicopter rotated forward before coming to rest. The pilot and passenger were able to exit the helicopter with minor injuries.
The investigation found that both drive belts between the engine and drive shaft had failed but the cause of that failure was not determined.