What was found
DURING BASIC CHECK, DURING THE DAMAGE EVALUATION FOR THE ACCOMPLISHMENT OF EA E170-53-070.3 UNDER DISPOSITION ETD2015-170-119167 FOR THE PERMANENT REPAIR, INSPECTION DISCOVERED ADDITIONAL DAMAGE. MULTIPLE DENTS WERE FOUND ON THE LT FWD FUSELAGE SKIN PANEL, PN 170-03387-001, NEAR FRAME 11 BELOW STRINGER 18L, AFT OF & IN CLOSE PROXIMITY TO AN INCOMING REPAIR DOUBLER THAT COVERS FWD SKIN PANELS PN 170-03387-001 & 170-03386-001. THE INCOMING REPAIR DOUBLER WAS REMOVED PER SRM PART II 51-41-02. AFTER INSPECTION OF THE ORIGINAL SKIN UNDERNEATH THE INCOMING REMOVED REPAIR DOUBLER, MORE ADDITIONAL DAMAGE WAS FOUND. OIL CANNING WAS FOUND BETWEEN FRAME 9 & 10, STRINGER 17L & 18L. MULTIPLE FASTENER HOLE LOCATIONS, 19EA, COMMON TO THE INCOMING REPAIR DOUBLER WERE FOUND TO BE DRILLED INTO THE CHEM-MILLED POCKET RADIUS OF THE ORIGINAL PRODUCTION SKIN. REFERENCE FIGURES 1 - 6 IDENTIFYING DAMAGE DETAILS. REQUESTED & RECEIVED ETD2016-170-025182 FOR THE ACCOMPLISHMENT OF THE PERMANENT REPAIR BY DOUBLERS INSTALLATION. ENGINEERING HAS CLASSIFIED THIS REPAIR AS A MAJOR REPAIR. EO E170-53MR-031.1 WILL BE ISSUED TO ACCOMPLISH FOLLOW UP INSPECTIONS, FOR DENTS BETWEEN FR10 - 13,STRINGER 18L-19L. TASK 53-10-016-0001 INTERNAL GVI THRESHOLD OF 24,731 FC OR 32,892 FH, INTERVAL OF 24,731 FC OR 32,892 FH, IS SUFFICIENT & IS MET USING THE INSPECTION REQUIREMENTS, MPG & MRBR REVISION 1. FOR REPAIR DOUBLERS, EXTERNAL DET THRESHOLD TOGETHER WITH THE NEXT SSI SCHEDULED INSPECTION, INTERVAL OF 37,000 FC. THERE IS NO SPECIFIC TASK IN MPG & MRBR REVISION 11 THAT COVERS THIS REQUIREMENT. THE EXTERNAL SDE SHALL BE ACCOMPLISHED BY MEANS OF A LFEC IN ORDER TO DETECT A CRACK ON THE SKIN UNDER THE DOUBLER. ACCOMPLISHMENT OF THIS MAJOR REPAIR IS ON EO E170-53MR-031 UNDER WO 2042803.