DOC AIRBUS | AMM A320FTURBINE INTERMEDIATE CASE (TIC) - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
A. Turbine Intermediate Case (TIC)
(1) The TIC is housed in the High Pressure Turbine (HPT) case and is made of an inner case, a turbine stator assembly and the No. 4 bearing assembly. The TIC is between the HPT and the Low Pressure Turbine (LPT).
(2) The TIC assembly uses eight TIC rods as supports to connect the inner case to the HPT case through the hollow vanes in the TIC stator assembly. The TIC rods function as supports for the No. 4 bearing compartment. The TIC stator assembly has 16 hollow airfoils that turns the gaspath airflow to align with the LPT rotor. Pressure, scavenge and drain oil tubes from the No. 4 bearing compartment go through the hollow vanes and also a buffer air tube goes through into the No. 4 bearing compartment.
Turbine Intermediate Case (TIC) ModuleA. The eight TIC rods connect the TIC inner case to the HPT case through hollow stator vanes.
(1) Pressure, scavenge and drain oil tubes from the No. 4 bearing compartment go through three of the remaining hollow vanes and two buffer air tubes go through a remaining boss into the compartment to supply cooling air to the outer No. 4 bearing housing.
(2) The stator vanes give protection to the rods and tubes from gaspath heat.
B. Attached to the TIC inner case is a No. 4 bearing support which contains the No. 4 bearing.
(1) This roller bearing is the axial support for the rear of the HPT and is of an oil-dampened type in which a pressurized oil film around the bearing outer race absorbs rotor vibration.
(2) The No. 4 bearing is installed to the rear of the HPT. This lets the bearing and its related oil system operate in a cooler area of the engine.
(3) Pressure oil lubricates the bearing and a scavenge tube removes the oil.