TM 1-1520-238-T-4 Change 3 6–169 6–86. CPG HIGH RPM ROTOR INDICATOR – DOES NOT LIGHT AT 104% N_R (ACV) 6–86 Tools: Nomenclature Part Number Tool Kit, Aircraft SC518099CLA01 Mechanic’s Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 67R Attack Helicopter Repairer 68X Armament/Electrical Systems Repairer One person to assist References: TM 1-1520-238-T-6 TM 1-1520-238-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – L140 fairing open Non–transparent barrier removed WARNING Turn off power before detaching or attaching wires and connectors. High current 28 VDC or 115 VAC is present. Failure to do so could result in death or serious injury. 1. Check for open between (A326)TB1–9–G and P49–9. Does open exist? YES Repair open wire. Go to paragraph 6–81. NO Go to step 2. 2. Check for open between (A326)TB1–9–M and P49–10. Does open exist? YES Repair open wire. Go to paragraph 6–81. NO Go to step 3. 3. Detach (A326)TB1–10–B. Check for open between P49–17 and P31–Y. Does open exist? YES Repair open wire. Go to paragraph 6–81. NO Go to step 4. 4. Replace engine out warning unit (TM 1-1520-238-23). Repeat paragraph 6–81, drive system–vibration maintenance operational check, step d. Does CPG HIGH RPM ROTOR indicator light at 104% N_R? YES Go to paragraph 6–81. NO Refer to TM 1-1520-238-T-6 to troubleshoot the pilot and CPG caution/warning system. END OF TASK