What was found
HORIZONTAL STABILIZER INBOARD RIB P/N 45A21104-012 FOUND WITH 3 INCH CRACK ALONG LOWER EDGE OF STAB CENTERING ROLLER BRACKET. BEEF UP ANGLES P/N 45A21085-004, AND 45A21086-004 ALSO FOUND WITH MULTIPLE STRESS CRACKS. EXCESSIVE LOADS ON ROLLER APPEAR TO HAVE CAUSED CRACKS, POSSIBLY FROM INCORRECT SHIMMING OF THE STABILIZER, WEAR IN FITTINGS, OR NEED OF DESIGN CHANGE OF BRACKET TO RIB ATTACH VIA SERVICE BULLETIN. CRACKS REPAIRED BY PART REPLACEMENT WITH FACTORY NEW. THIS IS THE THIRD FAILURE OF THIS ATTACH POINT THE SUBMITTER IS AWARE OF.