What was found
REAR SPINNER BULKHEAD WAS FOUND BROKEN AT NUTPLATE NEAREST TO AFT SIDE OF NR 1 BLADE. MATERIAL HAD COMPLETELY SEPARATED FROM BULKHEAD AND ALLOWED THE SPINNER TO BEND OUTWARD FROM CENTRIFUGAL FORCE. SPINNER WAS NOT OBVIOUSLY DAMAGED. THIS BULKHEAD WAS INSTALLED ON THIS AIRCRAFT AT 153.3 HOURS ACTT. THE SPINNER WAS ALSO REPLACED AT THIS TIME DUE TO CRACKING, THE SPINNER WAS REPLACED A SECOND TIME AT 394.7 HOURS ACCT DUE TO CRACKS FROM THE BLADE CUTOUT. AT THIS TIME THE BULKHEAD WAS INSPECTED WITH NO SIGNS OF CRACKING.