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ACCESSORY SECTION The accessory section of the turbojet engine has various functions. The primary function is to provide space for the mounting of accessories necessary for the operation and control of the engine. It also includes accessories concerned with the aircraft, such as electric generators and fluid power pumps. The secondary purpose includes acting as an oil reservoir, oil sump, and providing for and housing of accessory drive gears and reduction gears. The arrangement and driving of accessories have always been major problems on gas turbine engines. Driven accessories are mounted on common pads either ahead of or next to the compressor section as shown in Figure 1-49. The parts of an axial-flow engine accessory section are the accessory gearbox and a power takeoff assembly. These units contain the necessary drive shafts and reduction gears. Figure 1-50, views A and B show the location of the accessory gearbox. The accessory gearbox and the power takeoff are located near each other. There are two factors that affect the location of gearboxes in general. These factors are engine diameter and engine installation. Designers strive to reduce engine diameter to make the engine more streamlined, thereby increasing performance by reducing drag. Figure 1-49 — the accessory section arrangement of a turboshaft engine. 1-32PDF Image | JET ENGINE THEORY AND DESIGN
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