What happened
During the conclusion of a local area flight, the owner-pilot executed a standard and smooth landing on the runway. After vacating the active pavement, the airplane taxied without incident until an unexpected mechanical failure occurred. Without any prior warning or indication of impending issues, the axle of the right main landing gear fractured. This structural failure caused the right side of the landing gear assembly to collapse completely under the weight of the aircraft.
The investigation
Examination of the accident site and the involved airplane revealed that the primary damage was localized to the right main landing gear structure. The fracture of the axle was the direct cause of the gear collapse. Further review of the aircraft's operational history indicated that the airframe had been in continuous service since approximately 1947. Maintenance records showed that the airplane was kept in an airworthy condition through a routine annual inspection program, rather than more intensive overhaul cycles.
Findings
The failure of the right main landing gear axle appears to be related to the age and fatigue history of the component, given the aircraft's long operational timeline. The pilot reported no unusual sensations during the landing or taxi phase prior to the collapse, suggesting a sudden material failure rather than a progressive degradation visible to the operator. The maintenance regimen of annual inspections was in place but did not prevent this specific structural failure.
Safety message
This incident highlights the potential for sudden structural failures in older airframes, even when maintained according to standard annual inspection requirements. Operators of vintage aircraft should remain vigilant regarding the fatigue life of critical landing gear components.