What was found
RT OTBD FLAP NR 4 FLAP CARRIAGE MOUNT FITTING ON FRONT SPAR OF FLAP ARE CHAFED FROM CONTACTING FLAP TRACK. FOUND TOP OF INBOARD LUG OF BOTH RT NR 4 FLAP CARRIAGE MOUNT FITTINGS WORN. MATERIAL LOSS OF INBOARD FITTING .05" OTBD FTTING .02" FROM RADIUS OF LUG. COMPLIED WITH RD 8/4-57-228 STEP NR1 AND 2, REMOVED MATERIAL OFF BOTH FITTINGS FOR NR4 FLAP CARRIAGE. OTBD LUG OF INBD FITTING AND INBD LUG OF OTBD FITTING. CHECKED AFFECTED AREA USING HFEC IAW NTM 51-00-01-250-801, NO DEFECTS NOTED. COMPLIES WITH STEP 3 OF RD 8/4-57-228. FINISHED AFFECTED AREAS WITH ALODINE AND PRIMER IAW RD 8/4-57-228 STEPS 4-6. COMPLETED REPAIR IAW RD 8/4-57-228 STEP 7.