Sequence of Events
The airplane landed normally. During the rollout, the pilot experienced a vibration and a pull to the left. Subsequently, a loud snapping sound was heard, and the left side of the airplane dropped to the runway. The airplane then pulled severely left, departed the runway, and came to a stop in the grass approximately 30 feet from the runway edge.
Post-Accident Examination
Examination of the landing gear revealed that a nut, washer, and cotter pin were missing from the left gear torque-link attachment. This discovery was made two hours Hobbs time after the accident occurred. The investigation noted that work had been performed on the left gear torque-link attachment during the last inspection.