TM 1-1520-238-T-44–84–2.LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (cont)4–2(d) Grip Control Collar.A grip control (CHOP) collar switch is installed inside the chop collars on thepilot and CPG collective sticks. The CHOP collar is spring–loaded in the aft position.(e) Turbine Speed Control Unit.The turbine speed control unit is located at the forward outboardside of the aft avionics bay. This unit has a rpm adjustment screw, an electrical connector, and two internalpotentiometers (one for each engine).M58-079LOAD DEMAND SPINDLE (LDS)(INPUTS FROM COLLECTIVESERVOCYLINDER OFHYDRAULIC SYSTEM)CONTROL CABLESPINDLE GEARBOXRPMADJUSTMENTINCREASEDECREASEHYDRO-MECHANICALUNIT (HMU)GRIP CONTROL COLLARHMU SHAFTTURBINE SPEED CONTROLPOWER AVAILABLE SPINDLE (PAS)(INPUTS FROM PILOT ANDCPG POWER LEVERS)COLLECTIVE STICKFigure 4–7.Engine Power Controls(7) Engine Indicator Controllers.The major components of the engine indicator controllers (fig. 4–8)are the fuel pressure switch and the oil pressure transmitter.(a) Fuel Pressure Switch.Fuel pressure switch is an electro–mechanical device that monitors lowengine fuel pressure.(b) Oil Pressure Transmitter.The oil pressure transmitter is an electro–mechanical device.
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