Chapter 23. -GAS TURBINE 



and housing accessory drive gears and reduction 

 gears. The accessory drive section of a gas 

 turbine engine is shown in figure 23-14. 



The gear train is driven by the engine rotor 

 through an accessory drive shaft gear coupling. 



The reduction gearing within the case provides 

 suitable drive speeds for each engine accessory 

 or component. Because the operating rpm of the 

 rotor is so high, the accessory reduction gear 

 ratios are relatively high. The accessory drives 



ACCESSORY DRIVE 

 IDLER SHAFT 



ACCESSORY DRIVE 



GEAR AND DRIVE 



SHAFT 



STARTER- 

 GENERATO 

 DRIVE 

 SHAFT 



OIL PUMP 

 DRIVE GEAR 



OIL PUMP 



ACCESSORY DRIVE 

 IDLER GEAR 



PINION SHAFT 



BEARING 



RETAINER 



SLEEVE 



INPUT BEVEL 



PINION AND 

 DRIVE SHAFT 



UPPER 

 HOUSING 



MAIN ACCESSORY 

 DRIVE SHAFT 



OIL SUMP 



147.148 



Figure 23-14.— Cutaway view of accessory drive section, 



605 



