What was found
DURING BASIC CHECK AT EAMS, INSPECTION DISCOVERED CORROSION DAMAGE TO THE AFT CABIN FLOOR STRUCTURE RT CENTRAL SEAT TRACK AT FRAME 84. EAMS REQUESTED AND RECEIVED A PERMANENT REPAIR IN THE FORM OF ETD2016-170-058915B WHICH PROVIDES INSTRUCTIONS TO ACCOMPLISH THE PERMANENT REPAIR OF CORROSION DAMAGE TO THE AFT CABIN FLOOR STRUCTURE RT CENTRAL SEAT TRACK, PN 170-86082-005 AT FRAME 84. THE APPROXIMATE DAMAGE DIMENSIONS ARE AS FOLLOWS: 1.50" X 1.0" TO A MAXIMUM DEPTH OF 0.020" DEEP. ACCOMPLISHMENT OF THIS PERMANENT REPAIR BY DOUBLER INSTALLATION WILL BE IAW ETD2016-170-058915B. BECAUSE THE FLOOR TRACK IS A PSE, ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR DUE TO STRENGTH RESTORATION. THIS IS NOT CLASSIFIED AS FCS, BUT WILL REQUIRE FOLLOW UP INSPECTIONS. EO E175-53MR-263.1 WILL BE ISSUED TO ACCOMPLISH THE FOLLOW UP INSPECTIONS IAW DER FORM ATTACHED. REF TASK 53-23-005-0001, INTERNAL GVI THRESHOLD OF 20483 FC OR 27242 FH, INTERVAL OF 10133, FC OR 13476 FH IS SUFFICIENT AND IS MET USING THE INSPECTION REQUIREMENTS: MPG/MRBR, REV 12. THRESHOLD IS COUNTED SINCE NEW. ACCOMPLISHMENT OF THIS PERMANENT REPAIR IS ON WO 2087588.