What was found
DURING ROUTINE CPCP INSPECTION, FOUND CORROSION ON UPPER SURFACE OF LEFT OVERWING LONGERON APPROX STA 1320. REMOVED CORROSION FROM ACCESSABLE AREA IAW SRM 51-10-01. CORROSION RUNNING UNDER LONGERON SPLICE RAISED EDR AS PER AIA ENGINEERING. REPAIRED LT OVERWING LONGERON IAW EA NBR B4-53-053. C/W THICKNESS CHECK .487 MIN THICKNESS, C/W HFEC SURFACE SCAR OF 8L X 2-1/4W AREA, UPPER HORIZ SURFACE OF LT OVERWING LONGERON 747 NDT MANUAL PART 6 51-00-00. NO CRACKS. CORROSION TASK CARD NUMBER C53-190-01. NON-ROUTINE TASK CARD NUMBER 25913.