Incident Summary
The pilot reported that after completing commercial maneuvers for a commercial check ride, the flight returned to the airport for touch-and-go landings. While in the pattern, the landing gear was extended, but the right main landing gear did not fully extend. Several attempts were made to extend the right main gear, all without success. The aircraft was eventually landed with the left main and nose gear extended. When the aircraft settled on the right side, it skidded off the runway.
Investigation Findings
Post-crash inspection of the right main landing gear found that the main landing gear actuator was broken. Examination of the actuator determined that the component fractured in two locations.
Actuator Examination
The fracture surfaces indicated the presence of closely spaced fatigue striations on the fracture surfaces that were located at the housing roller. The fracture surfaces that were located at the forward attaching bolt were indicative of overload.