What was found
THIS EO IS BEING ISSUED TO PROVIDE INSTRUCTIONS TO ACCOMPLISH THE PERMANENT REPAIR OF CORROSION DAMAGE TO THE FWD CABIN FLOOR STRUCTURE LT FWD SEAT TRACK, PN 170-03264-001, AT CROSSBEAM FRAME 17 & 19. THE APPROX DAMAGE DIMENSIONS ARE AS FOLLOWS. 1.0 INCH X .70 INCH WITH MATERIAL LOSS BEYOND 80%, 1.20 INCHES X 1.20 INCH WITH MATERIAL LOSS BEYOND 80%, .80 INCH X .80 INCH WITH MATERIAL LOSS BEYOND 80%. THE LT SEAT TRACK IS NOT CLASSIFIED AS FATIGUE CRITICAL STRUCTURE, FCS, IN FCSD-3575, BUT IS CLASSIFIED AS PRIMARY STRUCTURE IN SRM PART II 51-00-04. ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR DUE TO STRENGTH RESTORATION OF PRIMARY STRUCTURE. SUPPLEMENTAL FOLLOW UP INSPECTIONS ARE NOT REQUIRED IAW SRM PART II 53-10-10 REPAIR 01P. ACCOMPLISHMENT OF THIS MAJOR REPAIR WAS ACCOMPLISHED ON EO E175-53MR-237 UNDER WO 2013275.