Incident Overview
During the landing roll, the airplane began to veer left. Subsequently, the left main landing gear collapsed. The airplane came to rest upright on the left side of the runway with its left elevator resting on the runway's surface.
Pilot Actions
Prior to landing, the pilot had confirmed that the landing gear was down and locked. The pilot reported no anomalies with the airplane before the flight.
Post-Accident Examination
A post-accident examination revealed that the left main landing gear down limit switch plunger was bent and stuck in the closed position, falsely indicating that the left main landing gear was locked down. The examination further revealed that the two hydraulic hoses to the downlock actuator were making contact with the airplane's skin, binding the downlock from fully opening. This binding prevented the down limit switch from clearing the striker plate during the down cycle.
Corrective Action
The two hydraulic hoses were subsequently repositioned to eliminate the binding. After repositioning, the landing gear operated normally.
Undetermined Aspect
It was not determined how the switch had become bent.