What happened
The aircraft was observed flying in an erratic manner prior to its final impact. During an attempted landing, the plane plunged directly into a lake. The sequence of events suggests a sudden loss of control or situational awareness by the pilot during the critical phase of approach and landing.
The investigation
A thorough examination of the aircraft's systems was conducted to determine mechanical factors contributing to the accident. Investigators focused on the electrical system, specifically the ignition components. The inspection revealed that the left magneto was inoperative. This failure was traced to an internally shorted condenser within the magneto assembly.
Findings
The investigation uncovered a significant medical history associated with the pilot. Records indicated pre-existing medical problems that posed a risk of a convulsive episode with accompanied loss of consciousness. This medical condition is considered a primary factor in the erratic flight behavior observed before the crash. While the mechanical defect in the left magneto was identified, the medical evidence points to the pilot's health as the critical element leading to the accident.
Safety message
This incident highlights the importance of strict adherence to medical certification requirements for pilots. Pre-existing conditions that could cause sudden incapacitation, such as convulsive episodes or loss of consciousness, must be properly managed and reported to ensure flight safety.