JACKSCREW is a device used to lift heavy weights such as vehicles. Accident occurred on the 3d of January, 2014 in Silver City. The pilot reported that he lowered the landing gear and observed gear-down indications before touchdown; however, the landing gear collapsed during the landing. A postaccident examination of the airplane revealed that all three landing gears had collapsed; no anomalies in the extension/retraction linkage were found. It is possible that the nose landing gear did not fully extend and lock down before landing due to either the inoperative limit switch or a slight misreading of the system. However, because the landing gear was operated by the transmission JACKSCREW, it is unlikely that an issue with the nose landing gear would have caused a collapse of the main landing gear if the main landing gear was fully extended and locked in the down position. The reason for the landing gear collapse could not be determined. There were no injuries.