Accident to the helicopter SA315-B registered HB-XEO on 30/08/2016 at the Tretien [Investigation led by STSB / Switzerland]
Heurt du rotor principal avec une paroi rocheuse, collision avec le relief
Responsible entity
Preliminary data based on the notification from the Swiss authorities :
When disembarking workers in the field, the main rotor blades hit the rocks and the helicopter flipped onto its side.