What was found
DURING ROUTINE CPCP INSPECTION, FOUND LEVEL 2 CORROSION UPPER WEB OF KEEL BEAM BOX CORRODED AND CRACKED APPROX STA 1265 AT PREVIOUS REPAIR. REMOVED FASTENERS IAW B747 SRM 51-30-2. REMOVED CORROSION IAW B747 SRM 51-10-01. FOUND TO BE OUT OF LIMITS IAW B747 SRM 53-10-1. COMPLIED WITH HFEC INSPECTION OF OPEN HOLES AND BLENDED AREA NO CRACK INDICATIONS IAW B747 NDT MANUAL PART 6 51-00-00. REPAIRED IAW AIA EA B4-53-046. U/T THICKNESS CK HI .270 LOW .198. CORROSION TASK CARD NUMBER C53-100-01. NON-ROUTINE TASK CARD NUMBER 25912.