DOC AIRBUS | AMM A320FFAN INTERMEDIATE CASE (FIC) - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
A. Fan Intermediate Case (FIC)
(1) The FIC is made of titanium and located between the fan case and the Low Pressure Compressor (LPC). It gives an aerodynamic flow path between the fan rotor and the LPC and also functions as a support between the fan case and engine core through its connection to the Fan Exit Guide Vanes (FEGVs). The FIC houses the Fan Drive Gearbox (FDG) and the No. 2 bearing. The No. 2 bearing functions as a support axially and radially for the LPC and fan input coupling which supply torque to the FDG. There are eight hollow struts that are supports and supply a passage through the airflow for oil, air and electrical components.
2. Description of the Fan Intermediate Case (FIC) Assembly
Fan Intermediate Case (FIC) AssemblyA. The FIC and fan exit fairing divide the airflow from the fan into the bypass airstream and the engine core airstream.
(1) The core airstream is straightened by the fan exit stators and FIC vanes to increase efficiency for the LPC.
B. The rear of the fan intermediate case contains the No. 2 bearing support assembly (which contains the No. 2 bearing and seals).
(1) The No. 2 bearing is a ball bearing and holds the LPC and fan input coupling axially and radially.
(2) The No. 2 bearing inner race halves are installed on a coupling which supplies the torque of the LPC and Low Pressure Turbine (LPT) to the FDG.
(3) There are knife edge and carbon seals at the No. 2 bearing compartment rear side to control oil and airflow.
(4) This bearing has oil damping features.
(5) A pressurized film of oil around the No. 2 bearing support assembly absorbs rotor radial movement and decreases vibration.