What was found
DURING M-CHECK, FOUND MAIN CABIN FLOORBEAM UPPER SURFACE CORRODED STA 377.7 LBL64-RBL 40. FOUND OUT OF LIMITS IAW SRM 53-00-51, PAGE 103, DETAIL IV. REMOVED CORRODED EXISTING FLOORBEAM REPAIR FROM LBL 64 TO BL 0 AND EXTEND CUT OUT ON FLOORBEAM STA 377 UPPER CAP FROM BL 0 TO RBL 45 IAW SRM 53-00-51. REPAIR 3, PAGE 201. FABRICATED REPLACEMENT CHORD, 2EA REPAIR ANGLES AND 2EA REPAIR STRAPS TO FLOORBEAM STA 377.7 LBL 64 TO RBL 45 PER NWA SRP B-757-A-53-01-07-801-663A-A PAGE 1 ANDSRM 53-00-51 REPAIR 3 PAGE 203. TREATED AND PRIMED AND INSTALLED REPLACEMENT CHORD, 2EA REPAIR ANGLES AND 2EA REPAIR STRAPS IAW SRM 53-00-51, REPAIR 3, PAGE 201.