On May 28, 2002, about 1415 eastern daylight time, a Mitsubishi MU2B-20, N54CK, piloted by an airline transport pilot, sustained substantial damage when the landing gear collapsed during landing on runway 23L (7,526 feet by 150 feet, dry ashpalt) at Willow Run Airport (YIP), Belleville, Michigan. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being operated under the provisions of Title 14 CFR Part 91. The pilot, the sole occupant, reported no injuries. The flight originated from Oscoda, Michigan, at 1325. The pilot stated, "Prior to landing, landing gear was selected down. Circuit breaker for landing gear motor had popped. Gear was not completely down and locked. Landing was completed." During the landing, the nose landing gear collapsed and the airplane came to rest on its nose. Subsequent to the accident, the landing gear system was inspected. No anomalies were found with respect to the landing gear system, or the landing gear unsafe warning system.