There are mainly 17 different modular structures in an Aircraft engine. 1. Fan module. a) Spinner Code b) Fan blades c) Fan forward Case d) LPC stator e) LPC rotor f) Fan shaft g) Fan frame 2. Core module a) HPC Stator b) HPC rotor c) compressor rear frame d) combustor e) HPT stage 1 module assy 3. HPT module a) HPT stator b) HPT rotor 4. LPT module a) LPT assy b) Turbine rear frame 5. AGB- Accessory Gearbox