An accessory drive housing assembly is mounted on the bottom of the air inlet housing. It provides mounting pads on the front face for the following:
The engine has a 14-stage axial flow compressor which supplies air for combustion, internal engine cooling, and operation of the aircraft pneumatic systems. The compressor has alternate rows of rotor blades and stator vanes. Each combination of rotor blade and stator vane is a stage of compression. As air passes through each stage of compression, it is compressed into a smaller area.