NTSB Identification: LAX89LA298.
The docket is stored on NTSB microfiche number 39896.
Accident occurred Friday, September 01, 1989 in COOL, CA
Probable Cause Approval Date: 06/16/1992
Aircraft: STINSON 108, registration: N97628
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.

WHILE CLIMBING TO CRUISE ALTITUDE, THE ENGINE SUSTAINED A LOSS OF POWER. UNABLE TO MAINTAIN ALTITUDE, THE PILOT ELECTED TO LAND ON AN ACCESS ROAD. THE LANDING WAS UNEVENTFUL, BUT DURING THE LANDING ROLL-OUT, THE LEFT WHEEL PANT STRUCK A ROAD MARKER. THE AIRPLANE THEN YAWED TO THE LEFT, EXITED THE ROADWAY, AND WENT THRU A BARBED WIRE FENCE AND ONTO A DIRT FIELD. AN ENGINE EXAMINATION DISCLOSED THE #2 PISTON WAS DESTROYED. THE PISTON WAS NOT IDENTIFIED AS BEING THE CORRECT ONE FOR THE ENGINE. THE ENGINE HAD ACCRUED 145 HOURS SINCE MAJOR OVERHAUL. THE OVERHAUL WAS PERFORMED BY AN A&P MECHANIC.

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

FAILURE OF THE #2 PISTON. FAILURE OF THE MECHANIC TO PROPERLY OVERHAUL THE ENGINE WAS A RELATED FACTOR.

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