TM 55-1520-240-T CHAPTER 4 POWERPLANT SYSTEM TROUBLESHOOTING CHAPTER OVERVIEW Chapter  4  contains  procedures  for   Powerplant  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 Powerplant System. Refer to TM 55-1520-240-23 for required maintenance procedures. SYSTEM PARA ENGINE PERFORMANCE CHECK (WITHOUT  74 ) 4-1 ENGINE ANTI-ICING SYSTEM (WITHOUT 74 ) 4-2 ENGINE LOW OIL LEVEL WARNING SYSTEM (WITHOUT  74 ) 4-3 ENGINE START AND IGNITION SYSTEM (WITHOUT  74 ) 4-4 GAS PRODUCER CONTROL SYSTEM (N1) (WITHOUT  74 ) 4-5 POWER TURBINE CONTROL SYSTEM (N2) (WITHOUT 74 ) 4-6 ENGINE     ACCESSORY     GEARBOX     CHIP     DETECTORS (WITHOUT 74 ) 4-7 SYSTEM PARA ENGINE PERFORMANCE CHECK (WITH 74 ) 4-8 ENGINE LOW OIL LEVEL WARNING SYSTEM (WITH  74 ) 4-9 ENGINE START AND IGNITION SYSTEM (WITH  74 ) 4-10 GAS PRODUCER CONTROL SYSTEM (N1) (WITH  74 ) 4-11 FULL AUTHORITY DIGITAL ELECTRONIC CONTROL (FADEC) (WITH 74 ) 4-12 ENGINE ACCESSORY GEARBOX CHIP DETECTORS (WITH 74 ) 4-13 FAILURE SYMPTOM LIST ENGINE PERFORMANCE CHECK (WITHOUT 74 ) SYMPTOM TASK DUAL ENGINE BEEP TRIM INCORRECT, ROTOR RPM BE- TWEEN 94-96 PERCENT WITH ECL AT FLIGHT 4-1.1 NO. 1 ENGINE HIGH PTIT READING DURING START OR HOT START 4-1.1 NO. 1 ENGINE GROUND IDLE SPEED BELOW 60 TO 63 PER- CENT RPM 4-1.1 NO. 1 OR NO. 2 ENGINE HIGH PTIT 4-1.1 SYMPTOM TASK ENG NO. 1 OR NO. 2 ANTI-ICE CIRCUIT BREAKER WILL NOT STAY CLOSED 4-2.4 SYMPTOM TASK NO. 1 OR NO. 2 ENGINE N2 OVERSPEED OCCURS WHEN ECL IS MOVED FROM GROUND IDLE TO FLIGHT 4-1.1 NO. 1 OR NO. 2 ENGINE OIL TEMP HIGH 4-1.1 NO. 1 OR NO. 2 ENGINE ROUGH OR SURGING ACCELERA- TION FROM GROUND IDLE TO FLIGHT 4-1.1 ENGINE ANTI-ICE SYSTEM (WITHOUT 74 ) SYMPTOM TASK NO. 1 ENGINE ANTI-ICING VALVE DOES NOT OPERATE (CLICK NOT HEARD) 4-2.4 ENGINE LOW OIL LEVEL WARNING (WITHOUT 74 ) SYMPTOM TASK NO. 1 OR NO. 2 ENGINE LOW OIL CAUTION LIGHTS DO NOT COME ON 4-3.3 SYMPTOM TASK NO. 2 ENGINE GROUND IDLE SPEED BELOW 60 TO 63 PER- CENT RPM 4-1.1 ROTOR RPM CHANGES MORE THAN +0 OR -2 PERCENT OR ENGINE TORQUE SPLIT EXCEEDS 6 PERCENT DURING HOVER 4-1.1 SYMPTOM TASK NO. 2 ENGINE ANTI-ICING VALVE DOES NOT OPERATE (CLICK NOT HEARD) 4-2.4 Change 17  4-2.1