ROTOR SYSTEM STARTS TO TURN WHEN POWER XFR NO. 1 AND NO. 2 SWITCHES ARE SET TO ON

NO. 1 OR NO. 2 PUMP FAULT LIGHT IS ON (Continued)

UTILITY HYDRAULIC SYSTEM SCHEMATIC

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 7-1.25 ROTOR SYSTEM STARTS TO TURN WHEN POWER XFR NO. 1 AND NO. 2 SWITCHES ARE SET TO ON 7-1.25 FAULT ISOLATION PROCEDURE INITIAL SETUP Equipment Condition: Applicable Configurations TM 55-1520-240-23: Battery Connected All Electrical Power On Tools: Hydraulic Power On Aircraft Mechanic’s Tool Kit, NSN 5180-00-323-4692 Crissair Check Valve Tool Kit Materials: None Personnel Required: Aircraft Pneudraulics Repairer Medium Helicopter Repairer References: TM 55-1520-240-23 General Safety Instructions: Make sure area around aircraft is clear of personnel before performing this task. Ro- tor blades can cause serious injury to personnel. TM 43-0104 SET POWER XFR NO. 1 SET POWER XR NO. 2 SWITCH TO ON. DOES ROTOR SWITCH TO ON. DOES ROTOR SYSTEM TURN BACKWARDS? REPEAT OPERATIONAL CHECK. SYSTEM TURN BACKWARDS? REPLACE THE CHECK VALVE ON NO. 2 POWER CONTROL MODULE THAT PREVENTS BACK FLOW TO NO. 2 FLIGHT CONTROL HYDRAULIC PUMP. REFER TO TM 43-0104. IF CHROME RIVET AND WASHER ARE NO LONGER INSTALLED IN CENTER OF OLD CHECK VALVE, RECOVER THE RIVET AND WASHER FROM THE HYDRAU- LIC TUBES TO THE PUMP. CHECK TUBE 145H1803-11 FIRST. 7-70 Change 8 END OF TASK

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