ENGINE CONTROL SYSTEM

TM 1-1520-238-10 2-30 BAT OVRD PWR PILOT PWR LEVER QUADRANT AND EMER PWR CHK OVSP TEST PANEL CPG PWR LEVER QUADRANT M01-017 Figure 2-19. Pilot Emergency Check Overspeed Test Panel Power Lever Quadrant and CPG Power Lever Quadrant 2.31 ENGINE CONTROL SYSTEM. The engine control system consists of the engine power lever quadrant, the engine chop controls, the load de- mand system, and the overspeed protection system. 2.31.1 Engine Power (PWR) Lever Quadrants. The PWR lever quadrants for the pilot and CPG (fig 2-19) al- low either crewmember to manage engine power. The two quadrant control panels are different, although the PWR levers are identical. Friction however, can be set on only the pilot levers. The PWR levers have four detent posi- tions: OFF, IDLE, FLY and LOCKOUT. The pilot detent override controls are mechanical while the CPG’s are electrically operated. Movement of either PWR lever moves a cable to mechanically shut off fuel (stop cock) or to set N_G speed. For flight, the lever is advanced to FLY. By moving the PWR lever momentarily to LOCKOUT, then retarding past FLY, N_G speed may be manually con- trolled. When the PWR lever is in LOCKOUT, the TGT lim- iting system is deactivated, and TGT must be closely monitored and controlled. The overspeed protection sys- tem is not disabled in the LOCKOUT position. CAUTION Physically confirm that engine chop col- lar is seated in its latched/centered posi- tion. 2.31.2 Pilot and CPG Engine Chop Control. The position of a knurled ring on each collective stick grip con- trols engine chop. The ring is placarded UNLATCH, CHOP and RESET. When the ring is pushed forward (UN- LATCH) and rotated 45� to the right to CHOP, the speed of both engines is reduced to idle. This is done by a switch in the grips that cuts out the power turbine speed reference signals for both engines. At this time, the ENGINE CHOP warning light will illuminate. The ENG 1 OUT and ENG 2 OUT lights and audio will not activate because engine chop activation disables this feature. The LOW RPM RO- TOR