Event Description
During arrival at the original destination, the pilot cycled the landing gear six times. The green gear-down indicator light for the right main gear did not illuminate. The pilot then used the emergency extension system to blow the gear down, after which the right main gear-down light illuminated. Following landing, the pilot inspected the landing gear but did not contact company maintenance personnel or use an external lock to secure the gear in the down-and-locked position.
Subsequent Flight and Landing
The pilot departed for the final destination with the gear remaining in the down position. During the subsequent landing roll, the right main gear collapsed.
Findings
Examination of the landing gear revealed corrosion and scoring of the metal inside the down-lock tube, where the teeth of the down-lock mechanism slide into the engaged position.