What happened
During the initial climb phase following takeoff, the aircraft type entered a steep, nose-down descent and collided with the ground. Witnesses on the ground reported that the takeoff ground roll exceeded 3,000 feet, which was significantly longer than expected. Observers noted that the engine produced abnormal sounds, described by some as sputtering, popping, or resembling a radial engine, and suggested that the power output was insufficient. A mechanic on-site observed engine surging and suspected issues related to fuel delivery, a turbocharger surge, or an excessively lean operating condition.
As the aircraft progressed, it began a sharp left turn at an altitude lower than normal, approximately between a quarter and a half-mile from the runway's end. The bank angle was estimated to be at least 45 degrees. During this maneuver, the nose dropped, leading to a spiraling descent into the ground. Post-crash analysis of radar data indicated the aircraft's airspeed during this final turn was approximately 82 knots, which matched the stall speed for a 45-degree bank angle.
Findings
Investigations into the aircraft's performance revealed that the takeoff ground roll was 1,300 feet longer than the predicted profile for the aircraft's weight and ambient conditions. The acceleration and climb performance were consistently below expected levels. While the aircraft was heavily damaged by a post-crash fire, investigators could not find evidence of a mechanical failure in the engine or airframe systems. Notably, the pistons and spark plugs showed no signs of combustion deposits.
Although the cockpit fuel selector lever and associated valves were found in the OFF position, engineering analysis determined there was insufficient fuel in the lines to even start or taxi the engine with the selector in that position. The investigation also noted that the aircraft had been stored outdoors during a rainy season with very low fuel levels. Furthermore, time constraints during the refueling process were identified, as the pilot had less than 18 minutes to complete refueling, reboarding, and engine start procedures.