Aviation Accident Summaries

Aviation Accident Summary ATL91LA157

ROXOBEL, NC, USA

Aircraft #1

N7658Z

PIPER PA-25-235

Analysis

THE AG PILOT WAS SETTING UP FOR AERIAL APPLICATION PASS WHEN THE ENGINE QUIT SUDDENLY. UNABLE TO GLIDE TO A CLEARED AREA, HE FORCE LANDED IN A WOODED AREA. THE ENGINE WAS EXAMINED FOLLOWING THE ACCIDENT. THE INVESTIGATION REVEALED THAT AN IMPULSE COUPLING STOP PIN FROM THE LEFT MAGNETO HAD FAILED. THE MAGNETO SUBSEQUENTLY JAMMED, AND THE TEETH OF THE MAGNETO DRIVE GEAR IN THE ENGINE WERE SHEARED OFF. THIS RENDERED BOTH MAGNETOS INOPERATIVE, RESULTING IN THE ENGINE STOPPAGE.

Probable Cause and Findings

THE FAILURE OF THE LEFT MAGNETO STOP PIN, RESULTING IN THE SEIZURE OF THE MAGNETO AND THE FAILURE OF THE MAGNETO DRIVE GEAR, AND ULTIMATELY ENGINE STOPPAGE. A FACTOR IN THIS ACCIDENT WAS: THE PRESENCE OF TREES AT THE FORCED LANDING AREA.

 

Source: NTSB Aviation Accident Database

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