Incident Overview
A pilot reported that during approach, he lowered the landing gear and verified three green lights, the nose gear visible in a mirror, and the red gear unsafe warning light off. Upon turning onto final approach and aligning with the runway, he again confirmed three green lights and nose gear visibility. He touched down on runway 9R and began the rollout.
Gear Collapse and Aftermath
Approximately five seconds after touchdown, the pilot applied brakes to make the first turn off. Immediately after applying brakes, the landing gear collapsed. The airplane slid down the runway, veered to the right, and came to a stop just off the side of the runway. The right outboard wing, undercarriage, and propeller sustained damage.
Post-Incident Examination
Examination of the airplane revealed the flaps were extended about 10 degrees and the landing gear handle was not fully down in its detent. The airplane was subsequently moved to a maintenance facility on the airport, where the landing gear was actuated seven times. Each actuation functioned normally, and no damage was noted to the gear locks or the squat switch.