What was found
#1 ENG WERE OB SHEAR TIE (FWD OF SKIRT BEAM) HAS CHAFFED INTO THE FWD BULKHEAD OF TORQUE BOX. DURING CURRENT HMV CHECK IN INDIANAPOLIS, IN (IND), MAINTENANCE DISCOVERED CHAFE AND GOUGE DAMAGE TO THE LH PYLON AFT ENGINE MOUNT BULKHEAD FITTING, P/N 311T2261-10 (-9 ASSY). THE DAMAGE IS TO ONE OF THE FLANGES NEAR THE TOP OF THE PART AT THE OUTBOARD AREA. SEE FIGURE 1 FOR DAMAGE LOCATION AREA. THE DAMAGE WAS CAUSED BY A BROKEN SHEAR TIE, P/N 313T3310-1157, WHICH IS PART OF THE SKIRT BEAM ASSY. THE BROKEN PART OF THE SHEAR TIE (STEEL) GOUGED INTO THE BULKHEAD FLANGE (ALUMINUM) DURING OPERATION. REPAIRED FITTING AND REPLACED SHEAR TIE USING EA H-5450-T0381500P1 (ERS 24-03203). FABRICATION OF SHEAR TIE DONE ON NR 147 (WO 89281) TO INCLUDE EA H-5400-T0381470P1 REV A (ERS 24-3217). REFERENCE DRW'S 311T2261, 311T2260 & DRW313T3310.