What was found
LEFT AIR CONDITIONING PACK INLET DUCT HAS HOLE 2.5 INCHES LONG BY 1 INCH WIDE. HOLE IS AT THE END OF A FOUR INCH LONG CRACK EXTENDING FROM WELDED BOSS. *S/D* FAILURE ATTRIBUTED TO FATIGUE CRACK ASSOCIATED WITH PITTING CAUSED BY ELECTRIC WELDING ARC STRIKE DURING MANUFACTURE. PROCESS CHANGES HAVE BEEN IMPLEMENTED TO AVOID FUTURE PROBLEMS. FLEETWIDE INSPECTION PROJECT INITIATED TO ADDRESS SUSPECT PARTS.