What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON FWD CARGO DOOR SURROUND, SILL BEAM FOUND WITH CORROSION (FR 25, +10.00", RBL 46). MATERIAL LOSS IS 67%. CORROSION MEASURES: 2.50" L X .650" W X .080" D. CORROSION WAS BEYOND LIMITS, THEREFORE THE SILL BEAM WAS REPLACED PER SRM 51-43-04. P/N: 170-67118-003. REF SRMI 53-21-11, FIG 10A, ITEM 180.