What was found
DURING A SCHEDULED INSPECTION, MAINTENANCE FOUND BLEED AIR DUCT, P/N 129-550051-1, CRACKED ALL AROUND THE BASE OF THE ACM OVERTEMPERATURE SENSOR WELD FITTING. THE PART WAS REPLACED. SUBMITTER STATES,WE HAVE NOW HAD THREE OCCURENCES ON DIFFERENT AIRCRAFT, SAME MODEL. (M)