As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED IN FLIGHT LOSS OF ALTERNATOR. ACFT LANDED W/O INCIDENT. INVESTIGATION REVEALED ALTERNATOR DRIVE CLUTCH GEAR. MISSING DAMPNER MATERIAL AND ALTERNATOR SHAFT BROKEN AT END OF ARMATURE. CUT OIL FILTER OPEN, FOUND TO BE FULL OF STEEL FILINGS. ALTERNATOR AND DRIVE CLUTCH INSTALLED 12-2009. LAST OIL CHANGE ON THIS ENGINE 13 HRS PRIOR. NO METAL DETECTED IN FILTER MEDIA AT THAT TIME. NO OPERATIONAL PROBLEMS NOTED PRIOR TO FAILURE.