TM 1-1520-238-T-4 4–113 4–32. PILOT ENGINE CHOP INDICATOR – DOES NOT LIGHT WITH PILOT COLLECTIVE STICK 4–32 IN CHOP Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68F Aircraft Electrician 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 – L200, R200 panels 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. At start mode relay panel, check for 5 VDC at P977–B17. Is voltage present? YES Go to step 3. NO Go to step 2. 2. Check for open between: P977–B17 and P469–A7, P482–A5 and P20–a. (A402): J2–A7 and J18–A5. Does open exist? YES Repair open wire. (Engine 1) Go to paragraph 4–12. (Engine 2) Go to paragraph 4–13. NO Replace pilot caution/warning panel (TM 1-1520-238-23). 3. At pilot collective stick, check for 28 VDC at J107–K. Is voltage present? YES Go to step 5. NO Go to step 4. 4. Check for open between: J107–K and P439–A13, J21–A13 and J21–A18, P439–A18 and P463–b. Does open exist? YES Repair open wire. (Engine 1) Go to paragraph 4–12. (Engine 2) Go to paragraph 4–13. NO Refer to TM 1-1520-238-T-6 to troubleshoot circuit protection system (dc emergency bus – pilot station) 5. Check for open between: J107–P and P977–A3, J107–M and P977–A4, J107–L and ground, J107–H and P978–A3, J107–F and P978–A4, P978–A9 and ground. Does open exist? YES Repair open wire. (Engine 1) Go to paragraph 4–12. (Engine 2) Go to paragraph 4–13. NO Go to step 6. 6. With pilot collective stick grip in CHOP position, check for open between: P107–K and P107–P, P107–K and P107–H, P107–L and P107–M, P107–L and P107–F. Does open exist? YES Replace pilot collective stick (TM 1-1520-238-23). NO Replace start mode relay panel (TM 1-1520-238-23). END OF TASK