Event Description
During the landing roll, the right main landing gear collapsed. The collapse occurred when the bolt that attaches the upper end of the drag leg failed in fatigue.
Landing Gear Failure
The aircraft was equipped with a drag leg that used a bolt to connect its upper end to the structure. That bolt experienced fatigue failure, leading to the separation of the drag leg and subsequent collapse of the landing gear.
Maintenance Practices
Company maintenance personnel did not remove this bolt regularly for inspection. Regular inspection of the bolt might have detected fatigue cracking before the failure.
Applicability of Service Instruction
Beech Aircraft Service Instruction 1183 calls for inspecting this bolt on aircraft equipped with certain part number drag legs. However, this aircraft was not affected by the instruction due to the specific drag leg installed. The drag leg on this aircraft was of a different part number than those covered by the service instruction.
Conclusion
The investigation determined that the bolt failed in fatigue, leading to the landing gear collapse. No other causal factors were identified.