Incident Summary
Following takeoff, the right main landing gear failed to retract. After reviewing procedures, the flight crew decided to continue to the destination. Upon arrival, when the landing gear was selected down, all landing gear indicated down and locked, and the captain visually confirmed the right main gear was extended.
During the landing roll, at approximately 60 knots, the right main landing gear indication became intermittently unsafe. The pilot flying added power to initiate a go-around, at which point the right main landing gear collapsed. The aircraft rolled and slid to a stop on the runway, after which an uneventful evacuation was conducted.
Investigation Findings
Examination of the right main landing gear assembly revealed that the extension/retraction actuator had failed at the spherical bearing. Metallurgical analysis determined that the spherical bearing had failed due to fatigue, evidenced by wear and binding in certain positions. The bearing was dry, with no evidence of lubrication present.
A review of the aircraft's maintenance procedures and records indicated that all required maintenance and inspections had been performed in accordance with applicable directives.