What was found
PDX -C1- CENTER WING AFT PANELS 262AT, 262HT, 262FT MATING SURFACE ON FWD SIDE HAS FRETTING CORROSION. HFEC INSPECTED BLENDS FOR CRACKS IAW Q400 NDT6M PART 6, 51-00-000-250-801 AND STEP 3 GENERAL NOTES OF RD 8/4-53-521. NO CRACKS NOTED. PERFORMED REPAIR ON PANELS IAW RD 8/4-53-521 STEPS 1,2,4-8. THE REMAINING THICKNESS OF THE MATERIAL IS .1 INCH. PANEL FOUND TO BE WITHIN LIMITS REF RD 8/4-53-521, PG 2 AND NOTE 2 ON PAGE 4. VERIFIED CAMLOCK GRIP LENGTH, LANDING STRIP FOUND TO BE GREATER THAN .090 INCH STANDARD CAMLOCK STUD GRIP LENGTH IS ACCEPTABLE IAW RD 8/4-53-521 GENERAL NOTES 9 AND 10. INSTALLED TEFLON TAPE IN LIEU OF WET SEALANT IAW RD 8/4-53-451 GENERAL NOTES 7.