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 RT FWD SEAT TRACK PN 170-03263-001 AT Y=273, FRAME 16 & 17. THE APPROX DAMAGE DIMENSIONS ARE AS FOLLOWS. 1.10 INCHES X 1.10 INCHES WITH 100% EXFOLIATION IN THE DEEPEST LOCATION. .90 INCH X 0.80 INCH WITH 100% EXFOLIATION IN THE DEEPEST LOCATION & .50 INCH X .50 INCH WITH 100% EXFOLIATION IN THE DEEPEST LOCATION. REQUESTED & RECEIVED THE PERMANENT REPAIR IN THE FORM OF ETD 2015-170-102505A FOR THE INSTALLATION OF REPAIR ANGLES & DOUBLERS. THE RT 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. EO E175-53MR-219.1 WILL BE ISSUED TO ACCOMPLISH FOLLOW UP INSPECTIONS IAW ETD2015-170-102505A ANAC DER FORM ATTACHED. REF INSPECTION INSTRUCTIONS. TASK 53-10-027-000 INTERNAL GVI THRESHOLD OF 25,202 FC, INTERVAL OF 25,202 FC IS SUFFICIENT & IS MET USING THE INSPECTION REQUIREMENTS. MPG & MRBR REVISION 11. THRESHOLD IS COUNTED SINCE NEW. ACCOMPLISHMENT OF THIS MAJOR REPAIR WAS ON EO E175-53MR-219 UNDER WO 1983823.