What was found
LT CREASE BEAM INNER CORD AT FR 23 HAS CORROSION. (LEVEL II) PART NOT LISTED IN SRM. SRKM SHOWS PN S5307020820251 FOR RT SIDE ONLY. THERE IS NOT A SYMMETRICAL PART IN THE MANUALS FOR THE LT SIDE, BUT AC HAS ONE INSTALLED. REMOVED CORROSION REFERENCING ATR 72 SRM 51-21-42 REV 77. SPLICE MEASURED AND FOUND TO BE WORKED BEYOND LIMITS. NOMINAL METAL THICKNESS IS .080" METAL THICKNESS AFTER CORROSION REMOVAL IS .065". REMOVED SPLICE REFERENCING ATR 72 SRM 51-25-01 REV 77 AND 51-25-04 REV 77. INSTALLED NEW CREASE BEAM INNER CHORD SPLICE FR 23 LT IAW ATR 72 SRM 51-25-01 + 51-25-03 REV 77.