What was found
THIS EO IS BEING ISSUED TO PROVIDE INSTRUCTIONS TO ACCOMPLISH THE PERMANENT REPAIR OF CORROSION DAMAGE TO THE CENTER FUSELAGE FLOOR STRUCTURE RT SEAT TRACK, PN 170-99451-001 BETWEEN FRAME 48-49. THE DAMAGE WAS REMOVED BY BLEND OUT WITH THE FOLLOWING APPROXIMATE DIMENSIONS: 2.25" X 0.75" X 0.025" DEEP. ACCOMPLISHMENT OF THIS TRACK SPLICE REPAIR WILL BE IAW ETD2016-170-082140 AND THE PRINCIPLES OF SRM PART II 53-00-10, REPAIR 01P. ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR BECAUSE THE SEAT TRACK IS A PSE AND THIS EO IS RESTORING STRENGTH. EO E175-53MR-297.1 WILL BE ISSUED TO ACCOMPLISH FOLLOW UP INSPECTIONS, REF TASK 53-22-012-0001, INTERNAL GVI THRESHOLD OF 20000 FC, INTERVAL OF 18212 FC, IS SUFFICIENT AND IS MET USING THE INSPECTION REQUIREMENTS: MPG, MRBR, REV 12. THRESHOLD IS COUNTED SINCE NEW. THIS PERMANENT REPAIR WILL BE ACCOMPLISHED ON WO 2135820.