As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED RT PORTION OF MAGNETO INOPERATIVE (TCM DOUBLE MAG). INVESTIGATION REVEALED SEVERAL TEETH BROKEN FROM RT DISTRIBUTOR GEAR (PN 10-682016) ALLOWING GEAR NOT TO ROTATE. INSPECTION OF LT GEAR SHOWED ONE TOOTH BROKEN, HOWEVER, GEAR WAS STILL ABLE TO TURN. CAUSE OF FAILURE UNKNOWN, IT IS SUSPECTED THAT GEAR TOOTH FAILURE OF ONE GEAR CAUSED FAILURE OF THE OTHER GEAR DUE TO FAILED PART JAMMING OTHER GEAR. (X)