What happened
The pilot was conducting taxi operations in preparation for takeoff when the left main landing gear assembly unexpectedly separated from the airframe. The loss of support on that side caused the aircraft to collapse onto its nose and the left wing, coming to a final rest in that orientation.
Following the impact, fuel began leaking from the airplane's fuel tank. The leaked fuel ignited, resulting in a post-crash fire that consumed the aircraft.
The investigation
A detailed examination of the failed components was conducted to determine the root cause of the structural failure. Forensic analysis focused on the integrity of the landing gear assembly, specifically looking for signs of mechanical overload or material defects.
Findings
The inspection revealed that the left main landing gear spring had failed due to a preexisting fatigue crack. This defect was present prior to the incident and led directly to the separation of the gear during ground operations.