What was found
D-CHECK, DURING SCHEDULED MAINTENANCE INSPECTION, DELAMINATION WAS FOUND ON NR 4 PYLON FAIRING ASSY. AT THE AFFECTED AREA, SKIN AND CORE WERE TRIMMED FROM BOTH IB AND OB SIDES WITH REPLACEMENT CORE, SKIN AND DOUBLERS BONDED IAW SRM 51-40-06. PERFORM DETAILED VISUAL INSPECTION INCLUDING COIN TAP OF THE FAIRINGS AT THE SUBJECT REPAIR AREAS, EVERY C-CHECK OR 18 MONTHS WHICHEVER COMES FIRST FOR DELAMINATION, CRACKING OR LOOSE FASTENERS. EO TO BE ISSUED TO ACCOMPLISH INSPECTION AT C-CHECK OR 18 MONTHS, WHICHEVER COMES FIRST.