TM 10-7310-281-13&PMODERN BURNER UNIT (MBU)0009 00TROUBLESHOOTING PROCEDURES0009 00-3THIS PROCEDURE COVERS:MBU operates poorlyINITIAL SETUP:Maintenance LevelMaterials/PartsOperatorNoneCORRECT FUEL (JP-8) IN TANK? IS FUEL TAKENFROM CLEAN SOURCE?NoDRAIN FUEL TANK COMPLETELY IAW WP 0010AND REFILL AS IN WP 0005 OF 10-7310-281-13&P. START UP IAW WP 0005 OF TM.HAVE FUEL AND AIR FILTERS BEEN CHANGEDAT PRESCRIBED INTERVAL? IS FUEL NOZZLECLEAN?NoPERFORM PERIODIC SERVICES IAW WP 0012AND ATTEMPT STARTUP IAW WP 0005 OF TMARE AIR VENTS ON FUEL REGULATORASSEMBLY AND VENT VALVE ASSEMBLYCLEAN? ARE ASSEMBLIES PROPERLYSEATED?PERFORM ONLY THE CALIBRATIONPROCEDURE AS OUTLINED IN 0023 00-5. IFMBU BURNER OUTPUT STILL DOES NOT VARYSMOOTHLY, AFTER PERFORMINGCALIBRATION PROCEDURE, REPLACEFEEDBACK POTENTIOMETER AS DETAILED IN0023 00-5.YesNoYesPROCEED WITH OPERATIONSTILL OPERATES POORLYSTILL OPERATES POORLYYesYesSTILL OPERATES POORLYDOES MBU OPERATE NORMALLY?NoIF MBU CONTINUES TO OPERATE POORLY,REFER IT TO UNIT MAINTENANCENoCLEAN AIR VENTS. CHECK SEATING OFASSEMBLIES AND RE-INSTALL CORRECTLY.INSTALL A NEW O-RING. STARTUP IAW WP0005 OF TMYesSTILL OPERATES POORLYDOES MBU BURNER OUTPUT VARY SMOOTHLYFROM HIGH TO LOW SETTING?
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