Incident Overview
During an external load operation, the helicopter's engine displayed an indication of high torque, and the oil chip light illuminated. Subsequently, the engine lost power, prompting the pilot to initiate an autorotation. The helicopter collided with sloping terrain and rolled over.
Engine Inspection Findings
Inspection of the engine revealed that the number six and seven oil screens were improperly installed, which restricted the flow of oil. The entire engine exhibited signs of lack of lubrication and excessive temperatures.
Probable Cause
The improper installation of the number six and seven oil screens, restricting oil flow, leading to engine power loss.