What was found
DURING C4/S1 CHECK, INSPECTION REPORTED CRACK IN HOLE H4 ON THE NLG FITTING MOD (EO NR A0-53EO-20373, REV. B). UPSIZED HOLE FROM .277 TO .309 AND RE-INSPECTED HOLE. NO DEFECTS NOTED. INSTALLED NEW FASTENER IAW EA NR A9-53R-12284 AND SRM 51-49-00, TABLE 18.