On April 21, 1993, at approximately 1640 central daylight time, a Cessna 320C, N3057T, was substantially damaged following a gear up landing at North Little Rock Municipal Airport, North Little Rock, Arkansas. The commercial pilot, sole occupant of the airplane, was not injured. Visual meteorological conditions prevailed for the personal local flight. During an interview, conducted by a Federal Aviation Administration (FAA) inspector, and in a written statement the pilot reported the following information. While climbing to reenter the traffic pattern for a full stop landing, the pilot retracted the landing gear. Following his entry into the traffic pattern he placed the landing gear handle in the down position, however, he reported that "the pilot failed to verify 3 in the green before landing." An examination of the airplane following the accident and prior to removal from the site revealed that the landing gear handle was down and the circuit breaker was popped. No determination could be made for the popped circuit breaker. The airplane was released to the owner by the FAA inspector.