TM 1-1520-238-T-4 6–134 Change 1 6–62. OIL HOT NOSE GRBX 1 INDICATOR – IS LIGHTED WHEN HOD DISPLAYS NORMAL 6–62 NGB 1 OIL TEMPERATURE Tools: Nomenclature Part Number Tool Kit, Aircraft SC518099CLA01 Mechanic’s 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: 67R Attack Helicopter Repairer 68D Aircraft Powertrain Repairer/NDI 68X Armament/Electrical Systems Repairer 152FG Maintenance Test Pilot References: TM 1-1520-238-T-6 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 – L200 access panel and LN6, L60 fairings 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. Check HOD display NGB 1 oil pressure reading. Is reading 28 LB or lower? YES Go to step 3. NO Go to step 2. 2. Detach P18. Does indicator remain lighted? YES Refer to TM 1-1520-238-T-6 to troubleshoot the pilot caution/warning system. NO Go to step 4. 3. Visually inspect NGB 1 for low oil level and damage (TM 1-1520-238-23). Is damage present? YES Replace NGB1 (TM 1-1520-238-23). NO Go to step 5. 4. Detach P18 and check for short between J61–A and ground. Does short exist? YES Repair shorted wire between J61–A and P18–52. Go to paragraph 6–13. NO Replace NGB 1 metallic chip detector (TM 1-1520-238-23). 5. Remove NGB 1 oil 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 6. NO Replace NGB 1 (TM 1-1520-238-23). 6. Check for 28 VDC between J61–F and J61–G. Is voltage present? YES Go to step 7. NO Go to step 9.