As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PROPELLER SPINNER BULKHEAD FAILED RESULTING IN SPINNER DISINTEGRATION, AND LEAVING AIRCRAFT. FLEET INSPECTION WAS MADE INCLUDING RT PROP BULKHEAD. FOUND CRACKS BEGINNING AT MOUNTING HOLES FOR BULKHEAD. AFTER CLOSE INSPECTION, FOUND SPINNER SCREWS WERE BOTTOMING OUT ON ENGINE DAMPENER (DYNAMIC BALANCER) RESULTING IN PRE-LOADING SPINNER BULKHEAD. SUBMITTER RECOMMENDED INSPECTION FOR CORRECT SCREWS INSTALLED AND INSPECTION FOR CRACKS WITH DYE PENETRANT OR MAGNIFYING GLASS.