DOC AIRBUS | AMM A320FTURBINE FRAME ASSEMBLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The turbine frame module is the major structure assembly at the rear of the engine. It supports the Low Pressure Turbine (LPT) rotor rear section and provides for engine rear mounting on the airframe.
The turbine frame consists of the following major parts :
** ON A/C NOT FOR ALL The turbine frame module is the major structure assembly at the rear of the engine. It supports the Low Pressure Turbine (LPT) rotor rear section and provides for engine rear mounting on the airframe.
Turbine Frame AssemblyThe turbine frame consists of the following major parts :
- Turbine frame.
- No. 5 bearing support.
2. Description
A. Turbine Frame
The turbine frame assembly is made of nickel alloy and consists of a hub and a polygonal outer casing connected with radial struts. The struts support a fairing on the forward side and exhaust plug on the aft side.
The turbine frame assembly is made of nickel alloy and consists of a hub and a polygonal outer casing connected with radial struts. The struts support a fairing on the forward side and exhaust plug on the aft side.
(1) There are 16 struts, airfoil-shaped and perpendicular to the hub. The struts provide internal passage for the following items :
(a) Aft sump oil scavenge tube (No. 7 strut)
(b) Oil supply tube for the No. 4 and No. 5 bearings (No. 10 strut).
(2) The aft sump overboard seal drain tube is routed between struts No. 8 and No. 9.
Pre SB CFM 72-364
Pre SB CFM 72-364
(3) The front flange of the outer casing is bolted to the LPT case. Its rear flange supports the primary exhaust nozzle. At its periphery, there are 4 clevis mounts for engine/airframe adaptation, and 2 brackets for handling and installation on engine storage stand.
Post SB CFM 72-364
Post SB CFM 72-364
(4) The front flange of the outer casing is bolted to the LPT case. Its rear flange supports the primary exhaust nozzle. At its periphery there are 3 clevis mounts for engine/airframe adaptation, and 2 brackets for handling and installation on engine storage stand.
END SB CFM 72-364
END SB CFM 72-364
(5) The hub inner front flange carries the No. 5 bearing support. The inner rear flange has a flange assembly which supports the flame arrestor.
(6) Not Applicable
B. No. 5 Bearing Support
The No. 5 bearing support is made of steel alloy. Its outer flange is bolted, with the aft oil sump assembly, to the turbine frame. The inner flange of No. 5 bearing support accomodates the No. 5 bearing outer race and an adjusting sleeve.
The rear face of the support carries the oil inlet cover which supports the oil supply tube for the No. 4 and 5 bearings, and provides for pressurization of the dual air/oil seal installed at the rear end of the center vent tube rear extension duct.
The oil inlet cover supports the rear extension duct. The No. 5 bearing support has machined passages for :
The No. 5 bearing support is made of steel alloy. Its outer flange is bolted, with the aft oil sump assembly, to the turbine frame. The inner flange of No. 5 bearing support accomodates the No. 5 bearing outer race and an adjusting sleeve.
The rear face of the support carries the oil inlet cover which supports the oil supply tube for the No. 4 and 5 bearings, and provides for pressurization of the dual air/oil seal installed at the rear end of the center vent tube rear extension duct.
The oil inlet cover supports the rear extension duct. The No. 5 bearing support has machined passages for :
- Pressurizing air to the oil inlet cover,
- Sump bleed air to the center vent tube,
- Oil to the scavenge tube.