TM 1-1520-238-T-4 Change 5 4–121 4–39. ENG START ENG 2 INDICATOR – REMAINS LIGHTED ABOVE 52% N_G 4–39 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer One person to assist References: TM 1-1520-238-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – L200 panel 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. With MASTER IGNITION SWITCH to ON, set and hold ENG START NO 2 switch to IGN OVRD. Check for 1 0.1 VAC between P64–L and P64–M. Is voltage present? YES Go to step 3. NO Go to step 2. 2. Check for open between: P64–M and P36–5, P64–L and P36–3. Does open exist? YES Repair open wire between: P64–L and J448–A18, P64–M and J448–A17, P448–A18 and J22–28, P448–A17 and J22–29, P22–28 and P36–3, P22–29 and P36–5. Go to paragraph 4–12. NO Replace air turbine starter (TM 1-1520-238-23). 3. Place ENG START NO 2 switch to OFF. Check for short between P22–25 and P22–26. Does short exist? YES Replace engine starter air pressure regulator valve (TM 1-1520-238-23). NO Go to step 4. 4. Temporarily install replacement turbine speed cutout switch and go to paragraph 4–12. Does problem still exist? YES Replace flow turbine start switch (TM 1-1520-238-23). NO Replace turbine speed cutout switch (TM 1-1520-238-23). END OF TASK