Accident to the helicopter SA315 registered OE-EXU on 04/07/2017 at Dalaas [Investigation led by AAIB / Austria]

Preliminary data based on the notification from the authorities of Austria :

Helicopter approached off airport landing site for refuelling. External sling load assy attached. Pilot made abrupt control input, thus main rotor impacted tail rotor drive shaft. The pilot was unable to control the resulting rotation of the helicopter which crashed from relatively low height above ground.