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 TWO LOCATIONS LOCATED AT CROSSBEAMS 17 & 19. THE CORROSION DAMAGED AREAS MEASURE THE APPROX FOLLOWING DIMENSIONS. AT CROSSBEAM 17, – 1.4 INCH X 1.3 INCH TO A MAXIMUM DEPTH OF .040 INCHES DEEP. AT CROSSBEAM 18, – 1.3 INCH X 0.9 INCH TO A MAXIMUM DEPTH OF .029 INCHES DEEP. AT CROSSBEAM 19, – 2.7 INCH X 1.2 INCH TO A MAXIMUM DEPTH OF .020 INCHES DEEP. THE LT SEAT TRACK IS NOT CLASSIFIED AS FATIGUE CRITICAL STRUCTURE IN FCSD-3575, BUT IS CLASSIFIED AS PRIMARY STRUCTURE IN SRM PART II 51-00-04. THEREFORE 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-180 UNDER WO 1908400.