What was found
DURING ROUTINE CPCP INSPECTION FOUND LEVEL 2 CORROSION, SEAT TRACK CORRODED FROM BS 580 TO BS 600, BWL 310 (UPPER DECK) LBL65. REMOVED CORROSION IAW B747 SRM 51-10-01. FOUND OUT OF LIMITS IAW B747 SRM 53-10-01. ID MATERIAL PN BAC1520-1566. REPAIRED SEAT TRACK IAW SRM 53-10-21. CORROSION TASK CARD NUMBER C53-210-03-4. NON-ROUTINE TASK CARD NUMBER B0083-16-N-00393.