What happened
Shortly after departing for a cross-country journey, the aircraft was observed by witnesses flying in a nose-high attitude while simultaneously losing altitude. The aircraft's nose subsequently pitched down, followed by a sharp left roll that led to a collision with trees. Post-accident inspections of the engine and airframe revealed no mechanical anomalies prior to the impact.
Data retrieved from the onboard engine monitoring system indicated that while engine parameters initially progressed normally during the takeoff phase, they began to decline during the takeoff roll and continued to drop as the aircraft climbed. The monitoring data ceased functioning only seconds before the crash occurred. Additionally, the throttle quadrant friction lock was found in the disengaged position, though the throttle and condition levers were positioned forward.
Findings
Investigations into the aircraft's loading revealed that the flight was being conducted approximately 550 pounds above the maximum gross weight, and the center of gravity was 0.5 inches beyond the aft limit. This combination of an overweight load and an aft center of gravity significantly compromised the aircraft's controllability.
While the engine monitoring data showed a gradual reduction in power, the specific cause for this reduction could not be definitively established. However, toxicology reports noted the pilot had used the sedative zolpidem, which may have caused impairment, though the exact impact of the medication or underlying sleep issues could not be confirmed. Ultimately, the pilot exceeded the critical angle of attack during the initial climb, triggering an aerodynamic stall from which recovery was impossible.