DOC AIRBUS | AMM A320FFAN FRAME MODULE - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
The fan frame module is attached to the aircraft through the pylon.
The forward mount is attached to the hub engine mounting with eight screws.
The trust link fairings are part of the fan frame hub.
The fan frame module is composed of:
** ON A/C NOT FOR ALL The fan frame module is attached to the aircraft through the pylon.
Fan Frame ModuleThe forward mount is attached to the hub engine mounting with eight screws.
The trust link fairings are part of the fan frame hub.
The fan frame module is composed of:
- A fan frame shroud
- A set of Outlet Guide Vanes (OGV)
- An engine kit
- A fan hub
- A Variable Bleed Valve (VBV) door system
- An oil distributor
- A High Pressure Compressor (HPC) Inlet Guide Vane (IGV).
2. Component Description
A. Fan Frame Shroud
The fan frame shroud is the outer case of the fan frame module and it is supported by the OGV which are attached to the fan frame hub. It is made up of titanium.
It features several points for attachment for the components as follows:
The fan frame shroud is the outer case of the fan frame module and it is supported by the OGV which are attached to the fan frame hub. It is made up of titanium.
It features several points for attachment for the components as follows:
- Accessory Gearbox (AGB)
- Transfer Gearbox (TGB)
- Oil tank
- Oil scavenge tube pad
- Fuel zone
- Engine surface air cooling oil cooler.
B. OGV
The OGV set features 41 hollow aluminum OGVs and three OGV struts of titanium material.
There are nine different OGV profiles depending on their radial position around the fan hub. Each profile features murphy proof fixing holes on the fan frame shroud side with different spacing for their attachment at their corresponding location.
An outer platform made of thermoplastic material is linked to OGVs to provide a smooth profile. It is attached by two screws on the fan frame outer shroud.
The OGV set features 41 hollow aluminum OGVs and three OGV struts of titanium material.
There are nine different OGV profiles depending on their radial position around the fan hub. Each profile features murphy proof fixing holes on the fan frame shroud side with different spacing for their attachment at their corresponding location.
An outer platform made of thermoplastic material is linked to OGVs to provide a smooth profile. It is attached by two screws on the fan frame outer shroud.
C. OGV Struts
In addition to 41 OGVs, there are three structural OGV struts.
The three OGV struts are made up of titanium. They are located at 12 o'clock for OGV strut 1, 6 o'clock for OGV strut 5 and 8 o'clock for OGV strut 6:
In addition to 41 OGVs, there are three structural OGV struts.
The three OGV struts are made up of titanium. They are located at 12 o'clock for OGV strut 1, 6 o'clock for OGV strut 5 and 8 o'clock for OGV strut 6:
- The OGV strut 1 at 12 o'clock does not have any servitude.
- The OGV strut 5 at 6 o'clock consist of the oil scavenge tube, which is connected to the oil scavenge cavity (at 6 o'clock located in the fan hub) and to the lubrication unit.
- The OGV strut 6 at 8 o'clock consist of the TGB radial drive shaft which connects the Inlet Gearbox (IGB) and the TGB.
D. Fan Hub
The fan hub is the central part of the fan frame section. It consist of eight integrated struts:
The fan frame hub host HPC IGV.
An oil distributor is installed within the fan hub. Its purpose is to dispatch the oil to the three bearings and the IGB.
The fan hub is the central part of the fan frame section. It consist of eight integrated struts:
- The strut 2 hosts the No. 1 vibration sensor.
- The strut No 4 hosts the No. 1 speed sensor.
- The strut 5 hosts the oil scavenge tube which is connected to the oil scavenge cavity in the fan hub at 6 o'clock.
- The strut 6 hosts the TGB radial drive shaft which connects the IGB to the TGB.
- The strut 8 hosts the two oil supply tubes for the lubrication of the front sump.
The fan frame hub host HPC IGV.
An oil distributor is installed within the fan hub. Its purpose is to dispatch the oil to the three bearings and the IGB.
E. Engine Kit
The engine kit is a set of three struts in continuity with fan frame OGV struts and integrated on a central shroud.
The front flange of this central shroud is attached to the fan hub outer flange.
The upper part of the struts are attached to the fan frame shroud.
The rear flange of the central shroud is in contact with the thrust reverser inner fixed structure front flange.
The main functions of the engine kit are:
The engine kit is made up of:
The engine kit is a set of three struts in continuity with fan frame OGV struts and integrated on a central shroud.
The front flange of this central shroud is attached to the fan hub outer flange.
The upper part of the struts are attached to the fan frame shroud.
The rear flange of the central shroud is in contact with the thrust reverser inner fixed structure front flange.
The main functions of the engine kit are:
- To set up and be the link with the thrust reverser.
- To direct and provide a smooth aerodynamic airflow in the secondary flowpath.
- To link secondary VBV airflow with the primary airflow.
- To provide housing and protection for the tubings between core and fan module.
The engine kit is made up of:
- Fan frame flow path panels
- Three struts
- A central shroud
- VBV ducts.
(1) Fan Frame Flow Path Panels
The main function of the four aluminum fan frame flow path panels is to ensure a smooth aerodynamic airflow in the secondary flowpath by completing the ring made by the two surface air cooling oil cooler.
The main function of the four aluminum fan frame flow path panels is to ensure a smooth aerodynamic airflow in the secondary flowpath by completing the ring made by the two surface air cooling oil cooler.
(2) Struts
The three struts of engine kits are made up of titanium.
The three struts of engine kits are made up of titanium.
(a) Strut 1 at 12 o'clock
The strut 1 is installed on the fan frame shroud at 12 o'clock by the hanger and strut 1 outer fittings.
It is fitted to the fan frame strut by two strut 1 fairing supports. The upper strut fairing support is removable to get access to the pylon.
Two lateral fairings are installed on the strut 1 outer fitting, strut 1 pads and the strut 1 fairing supports.
The two strut 1 pads are attached to the fan frame hub.
There are no equipment installed on the strut 1.
The strut 1 seals are in contact with the pylon.
The strut 1 is installed on the fan frame shroud at 12 o'clock by the hanger and strut 1 outer fittings.
It is fitted to the fan frame strut by two strut 1 fairing supports. The upper strut fairing support is removable to get access to the pylon.
Two lateral fairings are installed on the strut 1 outer fitting, strut 1 pads and the strut 1 fairing supports.
The two strut 1 pads are attached to the fan frame hub.
There are no equipment installed on the strut 1.
The strut 1 seals are in contact with the pylon.
(b) Strut 5 at 6 o'clock
Strut 5 is installed on the fan frame shroud at 6 o'clock by the outer fittings and strut 5 fairing support.
Two lateral fairings are installed on the strut 5 outer fitting, strut 5 pads and the strut 5 fairing support.
The strut 5 pads are attached to the fan frame hub.
The strut 5 provides protection for the oil tubes and the two pressure sense lines.
Strut 5 is installed on the fan frame shroud at 6 o'clock by the outer fittings and strut 5 fairing support.
Two lateral fairings are installed on the strut 5 outer fitting, strut 5 pads and the strut 5 fairing support.
The strut 5 pads are attached to the fan frame hub.
The strut 5 provides protection for the oil tubes and the two pressure sense lines.
(c) Strut 6 at 8 o'clock
The strut 6 provides protection for the fuel hoses.
It is a one piece strut installed on the fan frame by the strut fairing support.
The strut 6 provides protection for the fuel hoses.
It is a one piece strut installed on the fan frame by the strut fairing support.
(3) Central Shroud
The central shroud features five segment shrouds fitted with eight VBV ducts and one Low Pressure Turbine (LPT)/High Pressure Turbine (HPT) Active Clearance Control (ACC) duct at 9 o'clock.
The central shroud features five segment shrouds fitted with eight VBV ducts and one Low Pressure Turbine (LPT)/High Pressure Turbine (HPT) Active Clearance Control (ACC) duct at 9 o'clock.
(4) VBV Ducts
Each VBV duct is composed up of:
Each VBV duct is composed up of:
- One seal (VBV duct aft seal) in contact with shroud panel and attached with plugs.
- One grid protecting the duct from foreign object.
- A second seal (VBV duct forward seal) attached with plugs in contact with fan frame hub VBV aperture.
F. Fire Protection
The engine kit is designed so as to avoid fire propagation between the core compartment and the fan compartment.
The strut 1 seals are in contact with the pylon.
The bottom flange of the strut 6 contains the fireproof block fire seal, used between the fan compartment and the core compartment.
The engine kit is designed so as to avoid fire propagation between the core compartment and the fan compartment.
The strut 1 seals are in contact with the pylon.
The bottom flange of the strut 6 contains the fireproof block fire seal, used between the fan compartment and the core compartment.