As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAGNETO WOULD NOT FIRE DURING MAINTENANCE GROUND RUN. FOUND DISTRIBUTOR BLOCK BUSHING WORN EXCESSIVELY. DISTRIBUTOR GEAR, P/N 10-349237, FINGER HITTING ELECTRODES CAUSING METAL GENERATION. THIS MAGNETO IS A FACTORY REBUILT UNIT, DELIVERED ON A FACTORY REBUILT ENGINE. BOTH ARE 117 HOURS TT. ALL OTHER MAGNETOS ON BOTH ENGINES WERE CHECKED SINCE SERIAL NR'S OF ENGINES AND MAGNETOS WERE CLOSE. FOUND SAME DISCREPANCY ON OTHER ENGINE. REF AQHA0303002. (M)