What was found
THIS EO IS BEING ISSUED TO PROVIDE INSTRUCTIONS TO ACCOMPLISH THE PERMANENT REPAIR OF CORROSION DAMAGE TO THE FWD CABIN LT SEAT TRACK PN 170-03264-001 IAW SRM PART II 53-10-10 REPAIR 1P. THE CORROSION DAMAGE CONSISTS OF 3 LOCATIONS, LOCATED AT CROSSBEAMS 17, 18 & 19. THE CORROSION DAMAGED AREAS MEASURE THE APPROX FOLLOWING DIMENSIONS. AT CROSSBEAM 17, 0.9 INCH X 0.6 INCH WITH 100% MATERIAL LOSS. AT CROSSBEAM 18, 0.9 INCH X 0.6 INCH WITH 100% MATERIAL LOSS. AT CROSSBEAM 19, 0.9 INCH X 0.6 INCH WITH 100% MATERIAL LOSS. THE LT SEAT TRACK IS NOT CLASSIFIED AS 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 1P. ACCOMPLISHMENT OF THIS REPAIR IS ON EO E175-53MR-183 UNDER WO 1914700.