What was found
INSPECTION TYPE:DURING PREFLIGHT, CRACKS MIGRATING FROM RIVET AT STATION 1480 ON LEFT SIDE OF FUSELAGE . APPX 6 IN. FWD OF OVERPRESS SAFETY VALVE. CRACK LENGTH IS .750 IN. THE UPPER DIRECTION & .500 IN. THE LOWER DIRECTION. REMOVED DAMAGED SKIN AT STA 1480, FABRCATED, DRILLED & FINISHED REPAIR. DFRL D206716 CLEARED ON LP 462587.