What happened
During the approach to landing, the pilot attempted to extend the landing gear using the gear selector, but the gear failed to deploy. In response, the pilot performed a manual extension by cranking the mechanism until resistance was felt. Despite this effort, the cockpit's gear down and locked indicator did not activate.
Upon arrival, ground personnel informed the pilot that the landing gear appeared to be in the extended position. The pilot proceeded with a normal approach and landing. However, during the landing roll, the pilot applied the brakes, which resulted in the main landing gear collapse.
The investigation
The investigation into the mechanical failure revealed that the landing gear slide tubes lacked necessary lubrication. Additionally, inspectors found that the right main gear slide tube was affected by corrosion. Records indicated that the aircraft had flown 16.25 hours since its last annual inspection, which had been completed on November 3, 1992.