What happened
During the preflight phase, the pilot completed a standard inspection and an engine run-up of the turboprop aircraft, noting no issues with the machinery. The flight proceeded normally through the initial takeoff roll and lift-off. However, the flight profile changed immediately after the pilot began the process of retracting the landing gear. At this moment, a decrease in engine torque was observed, though the engine RPM remained stable.
Following this initial drop, the engine torque experienced a sudden surge back to full power. This surge continued as the pilot attempted to maneuver the aircraft back toward the runway. During this period of instability, the left wing of the turboprop made contact with the ground. The aircraft eventually came to a stop in the grass adjacent to the runway.
Findings
Post-accident investigations of the engine, propeller, and associated accessories showed no signs of mechanical failure or malfunctions that would have prevented the engine from operating correctly prior to the event. While the engine experienced a significant power fluctuation, the specific reason for the partial loss of engine power and subsequent surge could not be identified from the available data.