BEAVER CITY, NE, USA
N9627Z
CALLAIR A-9
THE PILOT WAS ENGAGED IN AERIAL APPLICATION ACTIVITIES WHEN THE ACCIDENT OCCURRED. HE STATED HE HAD JUST ENTERED A CLIMBING LEFT TURN TO REVERSE DIRECTION AT THE END OF A SWATH RUN WHEN THERE WAS A TOTAL LOSS OF ENGINE POWER. HE LANDED STRAIGHT AHEAD IN A TERRACED WHEAT FIELD, AND THE AIRPLANE IMPACTED A TERRACE. THE PILOT ESTIMATED HE WAS ABOUT 50 FEET ABOVE THE GROUND WHEN THE POWER LOSS OCCURRED. POST-ACCIDENT INVESTIGATION REVEALED THE LEFT MAGNETO FAILED DUE TO A JAMMED FLYWEIGHT ON THE IMPULSE COUPLING. THE CRANKSHAFT DRIVE GEAR THEN FAILED, AND THE ENGINE LOST POWER.
THE INADEQUATE MAINTENANCE OVERHAUL OF THE LEFT MAGNETO, AND SUBSEQUENT FAILURE OF THE LEFT MAGNETO/IGNITION SYSTEM WHICH CAUSED A COMPLETE LOSS OF ENGINE POWER.
Source: NTSB Aviation Accident Database
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