The pilot had flown the aircraft, without incident, a number of times prior to the accident flight. He made a full flap, normal approach to land after checking that the landing gear was down and locked. The wind at the time was a light crosswind from the left. Touchdown was normal, but immediately afterwards the right gear leg collapsed. The aircraft veered sharply to the right and the other gear legs failed. The aircraft slid to a halt on its lower fuselage. The strip had a transverse gradient of three percent down to the right. Witness evidence and ground markings confirmed that the touchdown was normal. Inspection of the damaged components of the right gear indicated that the initial failure had been from overload forces. No significant pre-existing damage was evident.