What was found
SSI Z150-002 FRAME FR90A IS CORRODED ON AFT FACE BETWEEN STGR 27L AND 25L. (LEVEL 2 CORROSION). BLENDED ON CORROSION ON AFT FACE BETWEEN 27L AND 25L PER EMB 175 SRM 51-10-03. ORIGINAL MATERIAL THICKNESS .032" PER EMB 175 SRMI 53-30-04-10. MATERIAL LOSS .018", FOUND TO BE OUT OF LIMITS PER EMB 175 SRM 53-30-04/AD01. LOCATED, DRILLED, DEBURRED AND TREATED FASTENER HOLES ON NEW FR-90A PN:170-60377-005 PER EMB-175 SRM 51-40-02. CLEANED, PREPPED AND RESTORED FINISH ON FR-90A IAW E175 SRM 51-23-06, ETN-EJ-51-015. REMOVED AND REPLACED FRAME AT FR90A PER EMB-175 SRM 51-40-08. LEVEL 2 CORROSION