What was found
RIB ATTACH ANGLE CRACKED ON RIGHT WING, RIB 21, TOP SURFACE OF RIB, BETWEEN STRINGERS 3 AND 4. ITEM FOUND AT C-CHECK INSPECTION. INSTALLED REPAIR PART IAW EMB 120 SRM 51-25-00, 51-40-00, 51-30-01, 51-40-01, 51-40-02, 51-40-05 AND REF 57-20-07 FIG 6 ITEM 90.