PRINCIPLES OF NAVAL ENGINEERING 



ACCELERATION 

 LIMITER 

 BELLOWS 



VENT TO 

 ATMOSPHERE 



MINIMUM 

 FLOW VALVE 



GOVERNOR 

 VALVE 



DIFFERENTIAL 

 RELIEF VALVE 



ULTIMATE 

 RELIEF VALVE 



FROM BOOSTER 

 PUMP 



— ► TO FUEL 

 SHUTOFF VALVE 

 AND NOZZLES 



— COMPRESSOR 

 DISCHARGE 

 PRESSURE 



ACCELERATION 



FLOW 



ADJUSTING SCREW 



— ACCELERATION 

 LIMITER NEEDLE 

 VALVE 



FUEL PUMP 



FILTER PLY WEIGHTS 



Figure 23-17.— Schematic diagram of fuel control assembly. 



SPEED SETTING LEVER 



147,151 



system. The lubricating system illustrated is of 

 the dry- sump type, with a common oil supply 

 from an externally mounted oil tank. The system 

 includes the oil tank, the lubricating oil pump, 

 the hydraulic oil pump, the air inlet scavenging 

 pump, the oil temperature switch, the oil cooler, 

 oil filters, the pressure regulating valve, the 

 diverter valve, and a low pressure switch. 



All bearings and gears in the engine, acces- 

 sory drives, reduction gears, and reverse gear 

 are lubricated and cooled by the lubricating 

 system. Also, as may be observed in figure 

 23-18, the system illustrated here supplies oil 

 for the lubrication of the fuel control governor. 



ELECTRICAL SYSTEM.-In the gas turbine 

 engine, the electrical system (fig. 23-19) is the 

 principal means of automatic control of the 



engine. Electrical circuits which incorporate 

 speed and pressure sensing switches control the 

 starting and ignition sequence by opening and 

 closing various valves in the fuel system. Engine 

 operating conditions are reported by speed, 

 pressure, and temperature operated switches 

 and temperature bulbs. 



The electrical system usually includes a 

 starter, an ignition circuit, a control battery, 

 and relays. In addition, it includes electrical ac- 

 cessories and control components such as the 

 starting and ignition control switches and relays; 

 the panel-mounted instruments and indicator 

 lights for oil temperature, oil pressure, and en- 

 gine rpm; and engine-mounted reporting devices 

 such as fuel pressure switches, oil temperature 

 switches, oil pressure switches, and thermo- 

 couples. 



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