Figure 4–7. Engine Power Controls

TM 1-1520-238-T-4 4–8 4–2. 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 the pilot 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 outboard side of the aft avionics bay. This unit has a rpm adjustment screw, an electrical connector, and two internal potentiometers (one for each engine). M58-079 LOAD DEMAND SPINDLE (LDS) (INPUTS FROM COLLECTIVE SERVOCYLINDER OF HYDRAULIC SYSTEM) CONTROL CABLE SPINDLE GEARBOX RPM ADJUSTMENT INCREASE DECREASE HYDRO-MECHANICAL UNIT (HMU) GRIP CONTROL COLLAR HMU SHAFT TURBINE SPEED CONTROL POWER AVAILABLE SPINDLE (PAS) (INPUTS FROM PILOT AND CPG POWER LEVERS) COLLECTIVE STICK Figure 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 low engine fuel pressure. (b) Oil Pressure Transmitter. The oil pressure transmitter is an electro–mechanical device.