NTSB Identification: FTW00LA009.
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Accident occurred Saturday, October 09, 1999 in EL RENO, OK
Probable Cause Approval Date: 11/30/2000
Aircraft: Cessna 150G, registration: N3603J
Injuries: 1 Minor,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 total loss of engine power occurred during a dual cross-county instructional flight. During the ensuing forced landing in soft terrain, the nose landing gear collapsed. Examination of the Continental O-200-A engine, revealed that the intake rocker arm on the #4 cylinder was separated. Metallurgical examination indicated that a fatigue fracture initiated on the push rod side of the rocker arm. There was no evidence of machining defects or mechanical deformation associated with the fatigue crack propagation. The #4 cylinder had accumulated 76 hours of operation since new at the time of the rocker arm failure. No maintenance records were found for any repair, overhaul, or replacement of the rocker arm for the #4 cylinder. Total time on the engine was 3,198 hours.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The total loss of engine power resulting from a fatigue failure of the intake rocker arm for the #4 cylinder. A factor was the soft terrain encountered during the forced landing. Full narrative available
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