What was found
THIS EO IS BEING ISSUED TO PROVIDE INSTRUCTIONS TO ACCOMPLISH THE PERMANENT REPAIR OF CORROSION DAMAGE TO THE AFT CABIN FLOOR STRUCTURE RT AFT SEAT TRACK PN 170-86082-003 AT FRAME 84 & Y=+260. THE APPROX DAMAGE DIMENSIONS ARE AS FOLLOWS, 2.0 INCHES X 1.0 INCH TO A MAX DEPTH OF .020 INCH DEEP. ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR DUE TO STRENGTH RESTORATION, WILL REQUIRE FOLLOW UP INSPECTIONS. EO E175-53MR-238.1 WILL BE ISSUED TO ACCOMPLISH THE FOLLOW UP INSPECTIONS IAW ANAC DER FORM ATTACHED. REF TASK 53-23-005-0001 INTERNAL GVI, THRESHOLD OF 20,483FC OR 27,242FH, INTERVAL OF 10,133 FC OR 11,124FH, IS SUFFICIENT & IS MET USING THE INSPECTION REQUIREMENTS, MPG & MRBR REVISION 11, THRESHOLD IS COUNTED SINCE NEW.