What happened
Following a four-hour cross-country flight, the pilot received an unsafe gear indication while extending the landing gear during the approach to the destination. Upon inspection, the pilot confirmed that the right main landing gear remained unlocked and was only partially extended.
The crew attempted to rectify the situation by following the established emergency gear extension procedures, but these efforts were unsuccessful. Due to the configuration of the gear, the pilot elected to land on a grass area located to the east of the active runway. During the landing, the nose gear and left main gear were fully extended, while the right gear remained partially extended.
After touching down on the locked gear components, the aircraft rolled and skidded for 1,300 feet before coming to a complete stop. There were not injured during the incident.
The investigation
A post-accident examination of the landing gear system determined that the right main landing gear failed to reach the fully extended and locked position. Further inspection of the aircraft revealed that the emergency gear extension valve malfunctioned, preventing the successful deployment of the gear via emergency means.