TM 55-1520-240-TCHAPTER 15AUXILIARY POWER UNIT SYSTEM TROUBLESHOOTINGCHAPTER OVERVIEWChapter 15 contains procedures for Auxiliary Power Unit System troubleshooting. Each system and failure symptom is listed below.Included in this chapter are locations and views of all electrical connectors, receptacles, relays, and ground connections for the AuxiliaryPower Unit System.Refer to TM 55-1520-240-23 for required maintenance procedures.SYSTEMPARAAUXILIARY POWER UNIT15-1FAILURE SYMPTOM LISTAUXILIARY POWER UNITSYMPTOMTASKSYMPTOMTASKSYMPTOMTASKAPU CONT NORM OR APU CONT EMERG CIRCUITBREAKER DOES NOT STAY CLOSED15-1.4APU DOES NOT MOTOR WHEN APU SWITCH ISSET TO START (WITHOUT15-1.4APU DOES NOT MOTOR WHEN APU SWITCH ISSET TO START (WITH15-1.4APU HAS HOT START15-1.4APU MOTORS BUT DOES NOT START, ESU BITE lN-15-1.4APU MOTORS BUT DOES NOT START, ESU BITE lN-15-1.4APU MOTORS BUT DOES NOT START; ESU BITE lN-15-1.4APU ON CAPSULE GOES OUT (APU SHUTS DOWN)WHEN APU CONT CIRCUIT BREAKER OPENED15-1.4APU ON CAPSULE OUT WHEN APU OPERATINGNORMALLY15-1.4APU SHUTS DOWN DURING START, ESU BITE lNDl-15-1,4APU SHUTS DOWN WHEN APU GEN SWITCH ISSET TO OFF15-1.4APU STARTS AND RUNS BUT ESU BITE INDICATES15-1.4APU STARTS BUT SHUTS DOWN, ESU BITE lNDl-15-1.4APU STARTS BUT SHUTS DOWN, ESU BITE lNDl-15-1,4APU STARTS BUT SHUTS DOWN, ESU BITE lNDl-15-1.4ESU BITE INDICATORS ARE NOT BLACK OR APUFUEL BOOST PUMP CANNOT BE HEARD OPERATINGBEFORE APU SWITCH SET TO START15-1.415-2.1
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