Incident Overview
A pilot reported that while maneuvering, the engine lost power. Unable to maintain altitude, the pilot performed an autorotative landing into trees. The helicopter subsequently fell to the ground and came to rest.
Engine Examination
An examination of the engine was conducted by the operator, who holds an FAA-issued Airframe & Powerplant certificate. The examination revealed no evidence of engine failure or malfunction. The engine was then transported to the facility that had overhauled it approximately two years earlier. A subsequent examination at that facility also revealed no evidence of mechanical failure or malfunction.
Logbook Irregularity
According to FAA personnel in Oklahoma City, Oklahoma, the name and certificate number entered in the engine logbook indicating that the engine had been overhauled were not valid.
Conclusion
The source provides no stated probable cause for the loss of engine power. The examinations found no mechanical or engine failure, while the logbook entry for the overhaul was identified as invalid by the FAA.