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 1 BLADE SHANK BEARING FOUND BROKEN AND SEPARATED INTO NUMEROUS PIECES. HUB 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 MAXIMUM ALLOWABLE TIP MOVEMENT POST SB A190 CONDITION (.750), THE BEARINGS MAY BE EXPERIENCING CYCLICAL LOADS NOT PRESENT DURING ORIGINAL CERTIFICATION.