Incident Summary
An air taxi flight experienced a runway excursion during landing when the left main landing gear collapsed, causing the aircraft to depart the left side of the runway. A passenger on board confirmed that all three landing gear green indicator lights were illuminated, indicating that the landing gear was down and locked prior to touchdown.
Examination Findings
Upon inspection of the left main gear wheel well area, investigators recovered the left strut bellcrank attach flange forging and its connecting bolt, part number 464P4-26. Both components were found to be fractured. The strut forging exhibited a tensile overload failure, while the connecting bolt failed in tensile shear.
Conclusion
The mechanical failure of the left main landing gear components led to the collapse of the gear during the landing rollout, resulting in the aircraft veering off the runway. No further causal factors were identified in the source material.