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CHAPTER 7 HYDRAULIC "AIRFRAME" SYSTEMS TROUBLESHOOTING
POWER   STEERING   SYSTEM

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T FAILURE SYMPTOM LIST UTILITY HYDRAULIC SYSTEM SYMPTOM TASK APU OR UT PUMP FAULT LIGHT IS ON 7-2.4 HYDRAULICS OIL LEVEL CIRCUIT BREAKER WILL NOT STAY CLOSED 7-2.4 HYDRAULIC PWR XFR CIRCUIT BREAKER WILL NOT STAY CLOSED 7-2.4 HYDRAULICS UTILITY BLOWER CIRCUIT BREAKER WILL NOT STAY CLOSED 7-2.4 NO. 1 AND NO. 2 HYD FLT CONTR (WITHOUT 74) OR HYD 1 AND HYD 2 (WITH 74) CAPSULES ON WITH POWER XFR SWITCHES ON 7-2.4 NO. 1 OR NO. 2 HYD FLT CONTR (WITHOUT 74) OR HYD 1 OR HYD 2 (WITH 74) CAPSULE IS ON, SYSTEM PRESSURIZED 7-2.4 SYMPTOM TASK NO. 1 OR NO. 2 HYD FLT CONTR (WITHOUT 74) OR HYD 1 OR HYD 2 (WITH 74) CAPSULE COMES ON WHEN COCKPIT CONTROLS ARE MOVED 7-2.4 NO. 1 OR NO. 2 HYD FLT CONTR (WITHOUT 74) OR HYD 1 OR HYD 2 (WITH 74) CAPSULE IS ON WITH POWER XFR SWITCHES ON 7-2.4 PTU PRESSURE LINE PRESSURIZED WHEN ITS SYSTEM CONTROLS ARE TURNED OFF 7-2.4 UTIL HYDRAULIC COOLING BLOWER CIRCUIT BREAKER WILL NOT STAY CLOSED 7-2.4 UTILITY HYDRAULIC SYSTEM CAPSULE DOES NOT GO OUT OR PRESSURE INDICATION IS NOT BETWEEN 3200 AND 3500 PSI WITH APU RUNNING 7-2.4 SYMPTOM TASK UTIL HYDRAULIC SYSTEM CAPSULE OUT WHEN SYSTEM NOT PRESSURIZED 7-2.4 UTILITY HYDRAULICS TEMPERATURE INDICATOR EXCEEDS 95°C 7-2.4 UTILITY PRESS FILTER, UTILITY RTN FILTER, APU PUMP FAULT OR UT PUMP FAULT LIGHT DOES NOT COME ON WHEN PRESSED 7-2.4 UTILITY PRESS OR UTILITY RTN FILTER CHANGE LIGHT IS ON 7-2.4 UTILITY RESERVOIR LEVEL INDICATOR POINTER DOES NOT INDICATE FLUID LEVEL 7-2.4 CARGO RAMP AND DOOR SYMPTOM TASK CARGO DOOR DOES NOT EXTEND 7-3.4 CARGO DOOR DOES NOT RETRACT 7-3.4 RAMP CONTINUES TO CLOSE AS CARGO DOOR IS EX- TENDING 7-3.4 SYMPTOM TASK RAMP CREEPS WITH RAMP CONTROL VALVE HANDLE AT STOP 7-3.4 RAMP DOES NOT MOVE DOWN (RAMP IN CLOSED POSITION) 7-3.4 SYMPTOM TASK RAMP DOES NOT MOVE UP 7-3.4 RAMP MOVES WITH RAMP SWITCH AT OFF 7-3.4 UTIL SYS CONT CIRCUIT BREAKER DOES NOT STAY CLOSED 7-3.4 EMERGENCY CARGO RAMP AND DOOR EXTENSION SYSTEM (WITH 65) SYMPTOM TASK RAMP CONTROL VALVE DOES NOT OPERATE AS SELECTED FROM RAMP EMER SWITCH 7-3.4.1 RAMP CONTROL VALVE SOLENOIDS DO NOT ENGAGE AND RAMP CONTROL VALVE HANDLE IS NOT RESTRICTED IN STOP POSITION WHEN RAMP PWR SWITCH IS SET TO EMERG 7-3.4.1 SYMPTOM TASK RAMP EMERG CONT CIRCUIT BREAKER DOES NOT STAY CLOSED 7-3.4. SWIVEL LOCKS SYSTEM SYMPTOM TASK BRAKE STEER CIRCUIT BREAKER DOES NOT STAY CLOSED 7-4.4 LEFT RIGHT, OR BOTH AFT LANDING GEAR NOT LOCKED 7-4.4 SYMPTOM TASK SWIVEL LOCKS, POWER STEERING, AND WHEEL BRAKES CANNOT BE ISOLATED FROM UTILITY SYSTEM 7-4.4 7-2.2  Change 17







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