Accident Details
The main landing gear collapsed during the landing rollout. The pilot reported that when he selected 'gear down' the in-transit light illuminated, and when the landing gear had extended, the three landing gear position lights illuminated. The in-transit light did not remain illuminated after the landing gear had extended. The pilot stated there was "no gear warning indication or horn sounding." A normal landing was made, and prior to the first taxiway, both main landing gear collapsed. The pilot stated that when the main landing gear collapsed, the in-transit light illuminated and the landing gear warning horn sounded. The three landing gear position lights remained illuminated after the aircraft came to rest.
Post-Accident Examination
The airplane was elevated for an operational test of the landing gear. During normal gear extension, the nose and right main landing gear extended as designed. The left main landing gear extended approximately 3/4 down before becoming mechanically bound. The nose and right main landing gear position lights illuminated. The left main landing gear position light did not illuminate. The left main landing gear could be forced into the down-and-locked position, and the gear position light would illuminate.
Inspection of the left main landing gear revealed that the linkage between the left oleo strut assembly and the gear was corroded, and dirt was present on the landing gear position switches. The linkage was disconnected, and the left main landing gear moved freely.