What was found
DURING AIRPLANE'S MODIFICATION FROM P TO F/ACF FOUND CENTER WING, FRONT SPAR, PRESSURE BULKHEAD, STA 1159, X = -10, Z = -75: CRACK 7 INCH LONG. PERFORMED STRIP PAINT AREA, PERFORMED STOP DRILL 5/16'' DIA HOLE AT BOTH ENDS OF CRACK, NDI CHECK IAW CMM 20-20-03, NO MORE CRACKS FOUND. INSTALLED TITANIUM DOUBLER FROM X = -17 TO X = 5.54 AS PER SRM 53-40-00 FIG 17 VOL I.