What was found
CORROSION ON PASSENGER CABIN AFT WET AREA FLOOR BEAM AT BS 986 RBL 18; 23; 27; 35; 38; 40; 43. SRA 53-70-51-0I-1 IDENTIFICATION 1; SRM 53-70-51-1A-1 ALLOWABLE DAMAGE 1 AND SRM 53-70-51-2R-4 REPAIR 4 ARE APPLICABLE TO THIS ACFT. REMOVED CORROSION ON THE UPPER CHORD OF THE BS 986.5 FLOORBEAM IN MULTIPLE PLACES, BETWEEN RBL18-RBL43 IAW SRM 51-10-02. MAX MATERIAL REMOVED AT RBL 43 (NUTPLACE HOLE) IN AREA OF 2.2'LX0.9'WX0.077'DEPTH FROM AN ORIGINAL OF THE FLOORBEAM IS 0.150' IAW SRM 53-70-51-0I-1 TABLE 6 ITEM (1). MATERIAL LOSS 0.077'; REMAINING THICHNESS 0.073'. FOUND TO BE OUT OF LIMITS IAW SRM 53-70-51-1A-1 ALLOWABLE DAMAGE 1.