What was found
THIS EO IS BEING ISSUED TO PROVIDE INSTRUCTIONS TO ACCOMPLISH THE PERMANENT REPAIRS OF CRACK DAMAGE TO THE UPPER AND LOWER FLANGES OF RT RIB 11A P/N 170-62783-002 AND LT RIB 12A P/N 170-62642-001 ON THE HORIZONTAL STABILIZER. REFERENCE FIGURES 1-3 FOR DAMAGE DETAILS PERTAINING TO RT RIB 11A AND FIGURES 4-6 FOR DAMAGE DETAILS PERTAINING TO LT RIB 12A. ACCOMPLISHMENT OF THESE REPAIRS WILL BE BY DIRECT REPLACEMENT THE AFFECTED RIBS IN ACCORDANCE WITH DRAWING 170-62400-441 AND SRM CHAPTER 51 PRINCIPLES AND DO NOT REQUIRE SUPPLEMENTAL FOLLOW UP INSPECTIONS. ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR BECAUSE THE AFFECTED STRUCTURE IS PSE AND FCS.