Helicopter Tail Rotor Damaged After Striking Bush During Low-Level Mining Claim Flights

Accident Sequence

The pilot was flying a helicopter to specific locations within hilly sage and brush covered terrain. The passenger was setting mining claim stakes at intervals of 300, 600, and 1,500 feet. The pilot typically conducted movement between locations at a low altitude. As the helicopter flew over the crest of a hill, the pilot felt a shudder and subsequent vibration. He then initiated an autorotation to an open field, which was uneventful.

Post-Accident Inspection

After landing, the pilot noticed damage to the tailrotor and tailrotor drive shaft. During recovery of the helicopter, the pilot located a bush with several broken branches within the flight path. The pilot believed that the tailrotor struck the bush while maneuvering. The pilot reported no preimpact mechanical malfunctions or failures that would have precluded normal operation.