What happened
The incident occurred while the helicopter was executing a go-around maneuver. Specifically, during the crosswind leg of this phase of flight, the pilot experienced a partial loss of engine power. In response to the mechanical failure, the pilot declared an emergency and elected to perform a forced landing in an adjacent cornfield.
The investigation
Post-accident examination of the wreckage revealed specific mechanical discrepancies. Investigators found that the heli coil on the number 6 cylinder was disconnected. A thorough inspection of the remaining wreckage showed no other discrepancies with either the engine or the airframe, indicating the issue was isolated to this component.
Findings
The primary factor contributing to the incident was the disconnection of the heli coil on the number 6 cylinder, which resulted in the partial loss of engine power. This mechanical failure necessitated the emergency forced landing.