Incident Overview
The accident involved an agricultural airplane conducting seeding operations over a field. After completing the 8th seeding pass, the pilot initiated a turn for the 9th pass. During this turn, the airplane shuddered and performed three uncommanded banks before impacting the terrain.
Pilot Statements
The pilot initially reported that the airplane flew through its own wake turbulence and stalled while in a 60-degree bank to the right. However, in a later statement, the pilot suggested that a propeller malfunction may have caused a loss of control.
Post-Accident Examination
A thorough examination of the airplane's flight controls and propeller was conducted after the accident. No anomalies were found that would have prevented normal operation of the aircraft prior to the impact.
Conclusion
The investigation did not determine a definitive cause for the loss of control. The conflicting pilot statements and absence of mechanical discrepancies left the sequence of events unresolved.