What was found
DURING 763CK'S C4 CHECK AT KALITTA, CORROSION WAS FOUND ON THE LH WING, LOWER SKIN PANEL #3 BETWEEN WING STATION 668.2 - 694.2, RIB 19 - 20 AND A BLENDOUT WAS ACCOMPLISHED. BLENDOUT WAS BEYOND ALLOWABLE LIMITS STATED IN REF /A/. FVCI WAS CONTACTED TO PROVIDE AN FAA-DER APPROVED REPAIR. THE PURPOSE OF THIS REA IS TO AUTHORIZE AND DOCUMENT ACCOMPLISHMENT OF REF /B/, WHICH IS AN FAA-DER APPROVED REPAIR. ANALYSIS:WING SKIN IS CONSIDERED PRIMARY STRUCTURE AND FCBS PER 767-300 SRM 51-00-04 GENERAL, 767-FCBS-57-024. THIS REPAIR IS CLASSIFIED AS MAJOR.ACCOMPLISHED REPAIR AT LEFT WING SKIN LOWER SURFACE LEADING EDGE AT WS 630.2 IAW FLIGHT VEHICLES CONSULTING EO 25089-3 REV B.