What was found
PDX - COUNTERSINKS FOR 523AT HAVE FRETTING. REMOVED CORROSION FROM 2 COUNTERSINK HOLES ON FORWARD EDGE OF PANEL USING SCOTCH BRITE. REMOVED CORROSION FROM REMAINING COUNTERSINK HOLES, BLENDED DAMAGE. MEASURED ALL HOLES, 4 HOLES OVERSIZED. MAPPED AND ROUTED TO ENGINEERING. HFEC INSPECTED BLENDS FOR CRACKS IAW D8/400 NDTM, PART M, 51-00-06, NO CRACKS NOTED. INSTALLED NEW PANEL 523AT IAW AMM TASK 57-11-01-400-801, PARAGRAPH 4D, STEP 9-12, PAGE 410 AND 57-11-01-400-801, PARAGRAPH 5, PAGE 410-411.