On August 11, 1993, at 0825 central daylight time,a Beech 58, N7222V, was substantially damaged during landing at Adams Field in Little Rock, Arkansas. The commercial pilot and his passenger were not injured. Visual meteorological conditions prevailed for the executive transport flight. According to the pilot, during the landing roll out on Runway 36, he reached for the flap handle to retract the wing flaps as the airspeed decreased below 50 knots. The nose wheel immediately folded, followed by the main gears. The nose and left main landing gear fully retracted, while the right main gear was only partially retracted. The pilot further stated that the 1984 model Baron was purchased by the operator two days earlier. He had been flying an older model of the same type of airplane for many years and the location of the gear and flap handles were reversed on previous models. In the enclosed NTSB Form 6120.1/2, the pilot stated it was possible that he moved the landing gear lever but did not recall doing it. Damage to the airplane included four bulkheads and the keel assembly aft of the nose landing gear attaching point. The airplane was released to the owner's representative.