What was found
FUEL INCREASE OF 1200 POUNDS IN CENTER TANK ON CLIMBOUT. NOTE: CORRECTED TRANSFER WEIGHT FROM 12000 LBS TO 1200 LBS DUE TO TYPOGRAPHICAL ERROR IN INITIAL REPORT. *S/D* THE APPARENT FUEL TRANSFER WAS FOUND TO BE CAUSED BY FAILURE OF THE FUELING MANIFOLD DRAIN VALVES TO CLOSE DURING FUELING. AS A RESULT FUEL WAS PUT INTO THE CENTER TANK THAT, WHEN COMBINED WITH THE USUAL QUANTITY THAT DRAINS FROM THE FUELING MANIFOLD, RESULTED IN THE APPARENT TRANSFER ONCE THE AIRCRAFT REACHED TOP OF CLIMB AND WAS IN LEVEL CRUISE ATTITUDE. REPLACEMENT OF THE DRAIN VALVES WITH SERVICEABLE UNITS HAS RESULTED IN NORMAL SYSTEM OPERATION.