What was found
DURING HMV, CORROSION UPPER SURFACE OF UPPER SKIN CENTER WING BOX AT LEVEL FRAME 41 AND FR 42 BTW Y1292 AND Y1732 IN PASSENGER CABIN CPCP RELATED 571157-01 ; REF AEROMAN NR 2021-113286 WO 2021 116/1 PERFORMED PERMANENT REPAIR ON UPPER SURFACE OF CENTER WING BOX AT LEVEL OF FR 41 AND FR 42 R/H SIDE IAW EC A21-330-01AND EA # 57-0103-21 REVISION # 0 AND PART # 1 AND RDAF 80894292/004/2021 A DRAWING R57112226 ISSUE F THIS REPAIR IS CATEGORY A AND NOT NEED FURTHER INSPECTION