What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON FWD. FUSELAGE AREA, LOCATED AT FR 16 AND BTW STR 28L & STR 28R, SHEAR-TIE. MAT LOSS WAS 50%; L= .90" X W=.150"W X .D= .020". NO SPECIFIC DAMAGE LIMITS IN THE SRM OR AMM FOR THIS PART, MAT LOSS WAS 50%. THEREFORE, THE PART WAS DEEMED UNSERVICEABLE AND REPLACED PER SRM 51-41-02 AND 51-43-01. P/N: 170-06294-001, REF SRMI 53-10-04, FIG 41, ITEM 220.