LYNNWOOD, WA, USA
N6943M
STINSON 108-3
THE ENG FAILED APPROACHING THE ARPT AT LOW ALTITUDE. THE ACFT STRUCK TREES DURING A DESCENDING TURN TOWARD A POWER COMPANY RIGHT-OF-WAY. INVESTIGATION REVEALED THAT THE IMPULSE DRIVE SPRINGS ON BOTH MAGNETOS HAD FAILED IN FATIGUE. THE SPRINGS ARE NOT ASSIGNED A SERVICE LIFE LIMIT. REJECTION CRITERIA DURING MAGNETO OVERHAUL PERTAINS TO DISTORTION OF COIL SYMMETRY & OBVIOUS SIGNS OF WEAR. NO RECORD COULD BE FOUND OF REPLACEMENT OF THE MAGNETO IMPULSE SPRINGS. IT IS POSSIBLE THAT THEY WERE ORIGINAL EQUIPMENT DATING TO 1948.
Source: NTSB Aviation Accident Database
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