What was found
TWO HOURS AFTER TAKEOFF, A HEAVY ELECTRICAL ODOR AND SMELL WAS NOTICED BY THE CREW IN THE CENTER PEDESTAL AREA. A PRECAUTIONARY LANDING WAS EXECUTED. MAINTENANCE FOUND THE SOURCE OF THE SMOKE FROM THE NR 3 IRS COOLING FAN INVERTER. THE DEFECTIVE INVERTER AND FAN WERE REPLACED AND AN OPERATION CHECK OF THE SYSTEM PERFORMED. HONEYWELL TECH NEWSLETTER M23-3341-011-00 ADDRESSES THIS PROBLEM AND SUGGESTS REPLACING THIS KIT. SUBMITTER STATED THE NEW KIT IS NOT ELIGIBLE FOR INSTALLATION ON THIS MODEL AIRCRAFT.