Primary finding
Probable cause
The pilot's failure to maintain obstacle clearance while maneuvering at low altitude at night, which resulted in the helicopter striking a tree.
Investigator assessment
Analysis narrative
The pilot of a helicopter reported that while maneuvering at low altitude, about 150 ft above the ground at night, the helicopter struck a tree. Subsequently, the helicopter started spinning to the right, impacted terrain, and rolled onto its left side. The helicopter sustained substantial damage to the tail-boom and fuselage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.
Source record
Factual narrative
The pilot of a helicopter reported that while maneuvering at low altitude, about 150 ft above the ground at night, the helicopter struck a tree. Subsequently, the helicopter started spinning to the right, impacted terrain, and rolled onto its left side. The helicopter sustained substantial damage to the tail-boom and fuselage. The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation.