What happened
The aircraft experienced a complete loss of engine power while operating during a standard cruise phase of flight. Upon realizing the failure, the pilot initiated emergency procedures to maintain control. The objective was to execute an autorotation maneuver into a visible clearing located within a wooded area.
The investigation
Following the accident, investigators conducted a thorough examination of the aircraft's mechanical systems. The inspection focused on the engine and fuel delivery components to determine the root cause of the power failure. Technicians discovered a significant air leak associated with the fuel control unit.
Specifically, the pressure compressor discharge line 'B' nut was found to be disconnected from the fuel control assembly. This separation compromised the internal pressure required for proper engine operation.
Findings
The mechanical disconnection caused the engine to reduce power output down to flight idle levels. This reduction was insufficient to sustain level flight, leading to the emergency situation. The primary factor contributing to the event was the failure of the fuel control system due to the loose connection.