What was found
OPERATOR REPORTED FUEL TOTALIZER INOPERATIVE ON AN INTERMITTENT BASIS. TOTALIZER DISPLAY WOULD OCCASIONALLY DASH OUT IN FLIGHT. FUEL TANK QUANTITY INDICATED NORMALLY DURING THIS TIME. INITIAL TROUBLESHOOTING INDICATED A FUEL COMPUTER PROBLEM. UNABLE TO DUPLICATE THE PROBLEM IN SHOP. INSPECTED THE FUEL FLOW HARNESS AND CONNECTOR, CLEANED CONNECTIONS. PROBLEM STILL OCCURRED IN FLIGHT. SUSPECTED DATA FROM FUEL FLOW TRANSMITTER IS MISSING INFORMATION. REMOVED AND REPLACED FUEL FLOW TRANSMITTER WITH OVERHAULED UNIT P/N TFF1573-20 S/N 0803-015AM. PROBLEM RESOLVED. FUEL TOTALIZER PROBLEM APPEARS TO BE RELATED TO INTERNAL WEAR IN THE FUEL FLOW TRANSMITTER AND HAS BEEN SEEN IN PC12 AIRCRAFT OVER THE YEARS. RECOMMEND PART REPLACEMENT AT ENGINE OVERHAUL OR SOONER TO PREVENT THIS ISSUE.