What was found
DURING AIRCRAFT CURRENT CHECK, MAINTENANCE DISCOVERED CORROSION ON THE UPPER SURFACE OF THE RIGH-HAND WING TOP SKIN PANEL #2 (PIN L 12T3302-4) BETWEEN STA 255-263 AND SU17. THE CORROSION WAS REMOVED BY BLENDING PER B767-300 SRM 57-20-01, AND FOUND TO BE OUT OF SRM ALLOWABLE LIMITS. AN ULTRASONIC (UT) INSPECTION WAS ACCOMPLISHED TO DETERMINE THE MINIMAL REMAINING MATERIAL THICKNESS AND RESULTS WERE RECORDED IN A 0.5'' X 0.5'' GRID PATTERN. INSPECTION REPORTED 0.174" REMAINING MATERIAL THICKNESS AT THE THINNEST LOCATION FROM 0.203" NOMINAL, THE MATERIAL LOST IS 14.3% AS SHOWN IN FIGURE 1. ALL FASTENERS COMMON TO REWORKED AREAS (AS REQUIRED) WERE REMOVED AND HFEC OPEN-HOLE AND SURFACE SCAN INSPECTIONS WERE ACCOMPLISHED PER 767 NDT MANUAL PART 6, 51-00-00 WITH NO DEFECTS NOTED. THIS REA PROVIDES REPAIR INSTRUCTIONS FOR THE SUBJECT LOCATION, AS APPROVED BY FLIGHT VEHICLES CONSULTING, INC. (FVCI).REPAIRED IAW ABX-REA-5725-65152-00