As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATOR CASE CRACKED AT MOUNTING FLANGE ALLOWING ALTERNATOR TO DEPART THE ACCESSORY CASE. THE ALTERNATOR ARMATURE STILL ROTATED FREELY. PROBABLE CAUSE: ENGINE VIBRATION, MFG REPORTED THAT THIS WAS THE 9TH ALTERNATOR TO FAIL THIS WAY.