What was found
DURING A MAINTENANCE VISIT FOUND CRACK, RT WING L/E LWR SKIN, INTERNAL DOUBLER AT STA XFS 597.5 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 DAC DWG NR 6769600-3 AND DC8 SRM 51-1-20.