What was found
WHILE 762CK WAS UNDERGOING C-CHECK IN OSC. MAINTENANCE DISCOVERED CORROSION ON THE L/H WING UPPER SKIN AT WING STA 1066, BETWEEN RIB 33 & 34, AT THE FWD SPAR. AFTER CORROSION REMOVAL, THE REMAINING MATERIAL THICKNESS WAS LESS THAN THE ALLOWABLE LIMITS OF SRM 57-20-0 I AD I, FIGURE 10 I. THE PURPOSE OF THIS REA IS TO AUTHORIZE AND DOCUMENT ACCOMPLISHMENT OF REF /A/, WHICH IS AN FAA-DER APPROVED REPAIR. , UH WING UPPER SKIN UPPER SURFACE CORROSION WAS FOUND AT STA 1066 AT FWD SPAR. CORROSION REMOVED BLENDED AREA TO A 20 TO 1 TAPER MATERIAL LOSS WAS 0.034" -NOMINAL THICKNESS OF 0.200". BLEND OUT MAPPED WITH A 0.500" GRID. REPAIRED IAW FLIGHT VEHICLES CONSULTING ENGINEERING ORDER CONTROL #24108-2 REV IR AND ABX-REA-5720-65485-00. AC RETURNED TO SERVCE