What was found
DURING A MAINTENANCE VISIT, FOUND INTERNAL DOUBLER CORRODED PAST LIMITATIONS IAW DC-8 SRM, AT Y=1580 BETWEEN LONGERON 31 RIGHT TO LONGERON 31 LEFT. SKIN HAD TO CUT AND REMOVED FOR ACCESS AT Y=1580 TO Y=1690 FROM LONGERON 31 RIGHT TO LONGERON 31 LEFT. REMOVED DAMAGE SECTION OF INTERNAL DOUBLER, FABRICATED AND INSTALLED FILLERS AND REPAIRED DOUBLERS IAW DER APPROVED ENGINEERING SKETCHES B21-R12 AND B21-R13. FABRICATED AND INSTALLED SKIN SPLICE DOUBLERS AT Y=1580 IAW ENGINEERING SKETCH B21-R03, TREATED AREA IAW DC-8 SRM 51-1-8.