What was found
DURING ROUTINE C CHECK INSPECTION, FOUND AFT CARGO COMPARTMENT, LONGERON-36 CRACKED AT STATION 1100.000. REMOVED FASTENERS AS NEEDED TO PERFORM REPAIR. REMOVED CRACKED LONGERON SEGMENT. FABRICATED NEW SEGMENT OF LONGERON AND EXTERNAL DOUBLER. INSTALLED NEW REPAIR PARTS IAW FORM 8100-9 DATED 03/15/2007, BOEING MESSAGE NUMBER 1-296019761-5 DATED 03/15/2007, DC8 SRM 53-2-2 FIGURE 13 TR NUMBER 53-191, DATED 10/15/2003, DC8 SRM 51-1-21, BOEING MESSAGE NUMBER 1-296019761-5 (SKETCH JCTO4049 FIGURE 1AND 2), SEMAN DRAWING ED-4470, AND DC8 SRM 53-4-1 FIGURE 44B SHEET 1 ITEM "R", DC8 SRM 51-2-0 FIGURE 50 SHEET 72B.