Landing Gear Collapse and Runway Overrun (N64)

Incident Overview and Sequence of Events During the landing phase, the right main landing gear downlock pin retracted just before or during touchdown. The aircraft touched down 21 feet short of the runway. It then traveled the full length of the 6,999-foot runway and continued for an additional one-fourth of a mile before coming to a stop on a golf course. No pre-touchdown mechanical, hydraulic, or electrical problems were identified. All four occupants escaped the incident uninjured. ## Official Findings and Probable Cause The official investigation identified multiple occurrences. The first occurrence involved the gear collapse during the landing flare/touchdown phase, with findings indicating that procedures/directives were not followed by the pilot in command and that gear retraction was inadvertent by the copilot/second pilot. Subsequent occurrences included loss of control on the ground during the landing roll, an encounter with terrain characterized by a ditch, a collision with a fence, and an encounter with water described as glassy.