As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INNER AND OUTER RACE OF NR 4 BLADE BEARING FOUND BROKEN AND SEPARATED INTO NUMEROUS PIECES. HUB WAS RENDERED SCRAP AS A RESULT OF BEARING FAILURE. SUBMITTER SUGGESTED ENGINEERING REVIEW OF LOADS IMPOSED AT BLADE/HUB INTERFACE. UNDER LOW C.F. LOADING IF THE BLADE IS AT MAX CONDITION (.750), THE BEARINGS MAY BE EXPERIENCING CYCLICAL LOADS NOT PRESENT DURING ORIGINAL CERTIFICATION.