What was found
DURING BASIC CHECK, INSPECTION DISCOVERED CORROSION ON THE LT INBOARD SEAT TRACK P/N 170-86081-003 UPPER FLANGE BETWEEN FR 84 AND 85. THE CORROSION DAMAGE APPROXIMATE DIMENSIONS ARE 1.00 INCH X 0.709 INCHES TO A MAXIMUM DEPTH OF 0.016 INCHES DEEP. PROPOSED A PERMANENT REPAIR BY INSTALLING A REPAIR DOUBLER WHICH WAS RELEASED IN THE FORM OF ETD2016-170-086245-A. DURING ACCOMPLISHMENT OF THE REPAIR, MAINTENANCE NOTED A MISDRILLED HOLED IN THE SEAT TRACK FLANGE. ETD2016-170-087081 WAS RELEASED TO CUT OUT THE DAMAGED AREA, REMOVE AND REPLACE THE DAMAGED UNDERLYING CORNER BRACKET, AND INSTALL A FILLER AND DOUBLER. ETD2016-170-088296 WAS RELEASED AS AUTHORIZATION TO USE P/N170-86102-004 IN PLACE OF THE REMOVED CORNER BRACKET P/N170-86146-003. BECAUSE THE FLOOR TRACK IS A PSE, ACCOMPLISHMENT OF THIS EO HAS BEEN CLASSIFIED AS A MAJOR REPAIR DUE TO THE RESTORATION OF STRENGTH. THIS STRUCTURE IS NOT FCS BUT THE REPAIR WILL REQUIRE FOLLOW UP INSPECTIONS. EO E175-53MR-299.1 WILL BE ISSUED TO ACCOMPLISH THE FOLLOW UP INSPECTIONS IN ACCORDANCE WITH ANAC 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 REVISION 12. THRESHOLD IS COUNTED SINCE NEW.