What was found
DURING ROUTINE CPCP INSPECTION, FOUND FRAME WEB BUCKLED AT BS 1500 BETWEEN STRINGER 43-47 BOTH LEFT AND RIGHT SIDE IN AFT CARGO COMPARTMENT FLOOR STRUCTURE FWD SECTION. REMOVED DAMAGE IAW B747 SRM 51-40-03 LEFT SIDE. ID MATERIAL IAW B747 SRM 53-10-23 7075-T6 .020. REMOVED DAMAGE IAW B747 SRM 51-40-03 RIGHT SIDE. ID MATERIAL IAW B747 SRM 53-10-23 7075-T6 .040. INSTALLED DOUBLER BOTH LEFT AND RIGHT SIDE IAW B747 SRM 53-10-04. CORROSION TASK CARD NUMBER C53-125-01-2. NON-ROUTINE TASK CARD NUMBER B0083-16-N-00755.