What was found
FOUR WORKING RIVETS AT FRAME 79 BETWEEN STRINGERS 4R TO 7R. REMOVED PAINT AT 4 EACH WORKING RIVETS IAW SRM 51-10-05. PERFORMED FPI TO AFFECTED FASTENERS IAW NDTM INTRODUCTION SECTION D.FIRST HOLE ABOVE STRINGER 4 FOUND TO BE CRACKED. REMOVED EXISTING RIVET AND ENLARGED HOLE TO .518 INCH IAW SRM 53-32-01. PERFORMED HFEC INSPECTION OF HOLE CUT OUT IAW NDTM 51-00-00-916-801-A00, NO DEFECTS NOTED. FABRICATED FILLER AND DOUBLER IAW SRM 53-32-01 FIG 204, AND FIG 205. LOCATED, DRILLED ALODINE, AND PRIMED THE FILLER AND DOUBLER IAW SRM 53-32-01 AND CPM 52-21-04 AND 51-21-05. INSTALLED THE FILLER AND DOUBLER IAW SRM 53-32-01 AND INSTALLED ALL OTHER WORKING RIVETS IAW SRM 51-40-02. RESTORED SURFACE PROTECTION IAW CPM 51-21-06 AND ETN GN-51-017.