What was found
CORROSION ON INTERCOSTAL AFT OF FR90 Y+ 10.748" (MAJOR REPAIR) REMOVED CORRODED AREA ON INTERCOSTAL BTW FR90 &FR91 +10.748" PER EMB-175 SRM 51-10-03. BLENDED AREA MEASURES L=1.4", W=0.7" D=0.- 009". THE ORIGINAL MATERIAL THICKNESS IS 0.040" PER EMB-175 SRMI 53-30-10/ FIGURE 10A (ITEM 280). BLENDED AREA IS FOUND TO BE OUT OF ALLOWABLE LIMITS PER EMB-175 SRM 51-75-16. LOCATED, DRILLED, DEBURRED, AND TREATED FASTENER HOLES ON NEW INTERCOSTAL P/N:170-61041-402 PER EMB-175 SRM 51-40-02, AND 51-23-04. RESTORED FINISH TO NEW INTERCOSTAL AND SUPPORT ANGLE PER EMB-175 SRM 51-23-06 AND CPM 51-25-00. REMOVED AND REPLACED INTERCOSTAL BETWEEN FR-90 AND FR-91 PER EMB-175 SRM 51-40-08. LEVEL 2 CORROSION