As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO, HAVING RT ROTATION AND IMPULSE COUPLING. INSTALLED ON ENG. ONE OF THE FLYWEIGHTS SEPARATED FROM THE IMPULSE COUPLING BODY AND BECAME JAMMED BETWEEN THE COUPLING AND THE MAGNETO HSG. THE DRIVE GEAR FORCE BROKE THE FLANGE OF THE MAGNETO CAUSING IT TO COME OFF OF THE ACCY DRIVE PAD.