TM 1-1520-238-T-4 6–115 6–49. HOD XMN 1 READING – DISPLAYS 28 LB OR LESS OIL PRESSURE 6–49 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Tool Kit, Powertrain SC518099CLA013 Repairer’s Adapter, Straight Pipe A1100-4-4 to Tube, Female Pipe End, 37 Flared Gage Pressure, Dial GGG76 Indicating (0-200 PSI) Multimeter, Digital AN/PSM-45 Personnel Required: 68D Aircraft Powertrain Repairer/NDI 68F Aircraft Electrician 152FG Pilot References: TM 1-1520-238-23 TM 1-1520-238-CL TM 9-1230-476-20-2 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – L60 fairings and L325, T250L, T250R, T290L, T290R and T325 access doors open 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. Visually inspect oil system 1 for low oil level and physical damage (TM 1-1520-238-23). Is damage present? YES Replace main transmission (TM 1-1520-238-23). NO Go to step 2. 2. Remove oil system 1 heat exchanger pressure transducer (TM 1-1520-238-23). Install pressure gage. Start engine 1 and place PWR lever to FLY. (TM 1-1520-238-CL). Operate until readings stabilize. Is oil pressure above 28 LB on pressure gage? YES Go to step 3. NO Go to step 4. 3. Check for open between: P673–95 and P673–94, P673–95 and P673–110, P673–95 and P673–111. Does open exist? YES Go to step 4. NO Go to step 5. 4. Check for open between: P579–1and P579–2, P579–1 and P579–3. Does open exist? YES Replace oil system 1 heat exchanger pressure transducer (TM 1-1520-238-23). NO Repair open wire between: P673–111 and J579–2, P673–95 and J579–1, P673–110 and J579–3, P673–94 and J579–3. Go to paragraph 6–13.