NTSB Identification: FTW97LA041.
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Accident occurred Friday, November 01, 1996 in TULSA, OK
Probable Cause Approval Date: 08/25/1997
Aircraft: Cessna 172RG, registration: N9520B
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

A witness stated that the airplane 'flared smoothly and touched down with what appeared to be no side load.' As the aircraft settled onto the runway surface, the right main gear collapsed, and the aircraft subsequently skidded off the right side of the runway. During examination of the right main landing gear, it was discovered that the gear pivot assembly was fractured adjacent to the spline. It has not been determined as to whether the fracture occurred during gear retraction, extension, or upon contact with the runway. According to maintenance records, Cessna Service Bulletin, SE390.1, April 20, 1990, was applicable to this aircraft and was complied with. The Service Bulletin's purpose was to inspect main landing gear pivot assemblies for cracks in the spline area. The pivot assembly that failed, P/N 2441100-9, had a total time of 1,611.8 hours. Visual inspection of the fractured surface showed evidence of overload, however a small area on the outer portion of the surface had several small cracks bordering the edge.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The failure of the main landing gear pivot gear assembly.

Full narrative available

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