While Taxiing To Parking The Right Landing Gear Leg Collapsed, Resulting In Substantial Damage Analysis: The pilot made a normal approach with full flaps and landed on the runway. While taxiing to parking the right landing gear leg collapsed, resulting in substantial damage to the fuselage and the right wing. Postaccident examination showed that the right main landing gear leg failed from a fatigue crack that had developed in the gear leg and was not identified during annual maintenance inspections.