TM 1-1520-238-T-4 Change 2 4–49 4–12. POWER PLANTS – MAINTENANCE OPERATIONAL CHECK (ENGINE 1) 4–12 Tools: Nomenclature Part Number Tool Kit, Aircraft SC518099CLA01 Mechanic’s Personnel Required: 67R Attack Helicopter Repairer One person to assist 152FG Pilot References: TM 1-1520-238-T-5 TM 1-1520-238-T-6 TM 1-1520-238-T-7 TM 1-1520-238-T-8 TM 1-1520-238-23 TM 1-1520-238-CL TM 55-2840-248-23 Equipment Conditions: Ref Condition TM 1-1520-238-23 Power Plants inspection performed Engine 1 power available spindle rigging procedure completed No. 1 and No. 2 Engine load demand spindle (LDS) rigging check completed TM 1-1520-238-T-7 FUEL SYSTEM VISUAL CHECK completed TM 1-1520-238-T-8 ENVIRONMENTAL CONTROL SYSTEM – POWER UP completed Paragraph 1–17 Maintenance headset connected Paragraph 4–10 POWER PLANTS – POWER UP completed NOTE Refer to pilot station (fig. 4–19) and CPG station (fig. 4–20) for cockpit configuration and equipment. If referenced out of one paragraph or volume and into another for additional troubleshooting, upon completion of the task, return to the maintenance operational check for the original paragraph or volume. If problem involves excessive torsional vibration and N_R droop during flight maneuvers (engine 1 Np lags engine 2 Np during recovery maneuvers), go to paragraph 4–57. The vapor vent procedure is to be performed anytime a connection is broken on any of the fuel delivery components to insure purging of air in lines. If vapor procedure is not required, go to step h.