What was found
DURING A MAINTENANCE VISIT FOUND CRACK, RIGHT WING, L/E LWR SKIN INTERNAL DOUBLER AT STA XFS 597.5, CRACKED AT THE DRAIN HOLE, CRACK RUNS AFT. DAMAGE EXCEEDED LIMITS IAW DC-8 SRM. REMOVED DAMAGED, TREATED AREA IAW DC-8 SRM 51-1-8. FABRICATED AND INSTALLED DOUBLER IAW MFG DWG 6769600-3 AND DC8 SRM 51-1-20.