As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OWNER REPORTED AN ALTERNATOR FAILURE IN FLIGHT. INSPECTED ALTERNATOR INSTALLATION AND FOUND BELT HAD FAILED AND ALTERNATOR BEARING HAD EXCESSIVE PLAY. REPLACED ALTERNATOR AND BELT. OPS CHECKED SATISFACTORY. THIS IS THE 5TH ALTERNATOR FAILURE WE HAVE SEEN ON THIS MODEL AIRCRAFT IN THE PAST 12 MONTHS. SUSPECT THAT THE ALTERNATOR BELT TENSION MAY BE TOO HIGH. PIPER AMM STATES 90 IN LBS WHICH PUTS ALOT OF STRESS ON THE ALTERNATOR AND DRIVE ASSEMBLY.