NTSB Identification: FTW86LA141.
The docket is stored on NTSB microfiche number 32295.
Accident occurred Thursday, July 31, 1986 in BARTLESVILLE, OK
Aircraft: CESSNA 150H, registration: N50101
Injuries: 1 Minor.

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

THE PLT TOOK OFF ON A TEST FLT AFTER AN ANNUAL INSPN OF THE ACFT & A TOP OVERHAUL OF THE ENG HAD BEEN COMPLETED. WHILE CLIMBING THRU ABOUT 1200 TO 1300 FT AGL, THE ENG STARTED RUNNING ROUGH, THEN QUIT. THE PLT ATTEMPTED TO RETURN TO THE ARPT, BUT WAS UNABLE. SUBSEQUENTLY, SHE LANDED THE ACFT IN AN AREA OF DENSE BRUSH & TREES. AN INV REVEALED THAT THE ROCKER ARM SUPPORT STRUCTURE ON THE #3 CYLINDER HAD FAILED, RELEASING THE ROCKER ARM SHAFT & BOTH ROCKER ARMS. TEARDOWN OF THE ENG REVEALED THAT THE #3 EXHAUST VALVE GUIDE WAS AN INCORRECT PART & WAS OVERSIZE IN LENGTH BY 0.165 INCH. THE OVERSIZE GUIDE WOULD NOT ALLOW FULL VALVE MOVEMENT & THE RESIDUAL MOVEMENT RESULTED IN FAILURE OF THE ROCKER ARM SUPPORT STRUCTURE.

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

MAINTENANCE,ANNUAL INSPECTION..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

ENGINE ASSEMBLY,VALVE,INTAKE..INCORRECT

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

MAINTENANCE,REPLACEMENT..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

ENGINE ASSEMBLY,VALVE,INTAKE..MOVEMENT RESTRICTED

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

ENGINE ASSEMBLY,CYLINDER..FAILURE,TOTAL


Contributing Factors

TERRAIN CONDITION..NONE SUITABLE


Contributing Factors

TERRAIN CONDITION..HIGH VEGETATION


Contributing Factors

OBJECT..TREE(S)

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