Accident Description
The helicopter departed from a ranch for a local area pleasure flight. At approximately 300 feet above ground level (AGL), a loss of power occurred while the helicopter was over a heavily wooded area. The pilot attempted to extend the glide by applying collective pitch and executing a right turn (quartering tailwind) toward the only available clear area. However, main rotor RPM continued to decay, and the helicopter descended vertically out of control, impacting onto an open field. The skids collapsed upon impact, and the helicopter rolled to the right.
Post-Accident Examination
Examination of the wreckage revealed that a misaligned P-lead wire in the magneto had chafed and arced. Additionally, both P-lead caps were found loose. The engine was subsequently test run, but the power loss could not be duplicated.
Maintenance Findings
The Director of Maintenance for the operator stated that he and his mechanic did not adjust the magneto timing because it was too difficult to reach on the helicopter.