NTSB Identification: LAX94LA260.
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Accident occurred Sunday, June 19, 1994 in BIG BEAR, CA
Probable Cause Approval Date: 05/04/1995
Aircraft: MOONEY M20J, registration: N201NK
Injuries: 2 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.
AFTER TAKEOFF, THE PILOT EXPERIENCED A LOSS OF ENGINE POWER AND DITCHED INTO A LAKE OFF THE DEPARTURE END OF THE RUNWAY. WITNESSES ON THE GROUND HEARD THE ENGINE MISSING AND OBSERVED SMOKE COMING FROM THE COWLING AREA. THE AIRCRAFT RECORDS INDICATE THAT THE MAGNETO WAS REPLACED WITH AN OVERHAULED UNIT 2 MONTHS PRIOR TO THE ACCIDENT. EXAMINATION OF THE MAGNETO FOUND THAT THE OIL SLINGER RING WAS LOOSE WHICH ALLOWED THE LUBRICATING OIL FROM THE CRANKCASE TO ENTER THE ELECTRICAL PORTION OF THE MAGNETO. THE SPARK PLUGS THEN FAILED TO FIRE PROPERLY RESULTING IN A RICH MIXTURE AND SUBSEQUENT SMOKE.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: a loss of engine power from a malfunctioning magneto due to a loose oil seal in an overhauled magneto. Full narrative available
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