LOW PRESSURE COMPRESSOR AND TURBINE The one stage LP compressor (fan) has 26 wide-chord type blades which are engaged in axial dovetail slots. Each fan blade is held in the disk by two shear keys. The LP compressor is located in the fan case. The fan case is made of two cylindrical cases, which are connected together with nuts and bolts. The front part of this assembly contains the LP compressor rotor and the rear part includes the Outlets Guide Vanes (OGVs). Attached to the outside of the rear part there are many system components, electrical harness and tubes. The LP compressor shaft connects the fan disk through a curvic coupling that gives the accurate location. The LP turbine has four disks which are bolted together to make a drum. The stage 3 disk acts as the drive arm and is attached to the turbine shaft with a curvic coupling. The LP turbine case supports the rear engine mount.