At about 1128 eastern time, a Cessna 402C on a post-maintenance test flight experienced a separation of the upper and lower link assemblies of the left main landing gear while landing at Kendall-Tamiami Executive Airport. The pilot and two passengers were not injured. The airplane was landing after a five-minute flight when it veered to the left and came to rest at the edge of the runway. The left main landing gear wheel assembly had rotated 15-20 degrees to the left from the normally installed position. The upper and lower link assemblies were not connected to each other. The airplane was towed to the ramp where the landing gear was repaired before NTSB or FAA inspection.