What was found
MCI - DURING OP 16 MAINTENANCE CHECK, FOUND A CRACK IN AFT FASTENER RIB, 18 IN OUTBOARD OF NR 5 SLAT CENTER TRACK RIB IN LE OF LEFT WING. REPLACED RIB PER SRM 51-01, PAGE 1 ITEM C. REPLACED HI-LOKS PER SRM 51-30-5. REPLACED RIVETS PER SRM 51-30-5. (M)