DOC AIRBUS | AMM A320FFAN FRAME ASSEMBLY - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The fan frame module provides front handling mounts and is the main forward support for mounting the engine to the aircraft. Its purpose is to support the fan, booster and high pressure compressor (HPC) rotors, and to provide ducting for primary and secondary airflows.
The fan frame module consists of the following major assemblies:
** ON A/C NOT FOR ALL The fan frame module provides front handling mounts and is the main forward support for mounting the engine to the aircraft. Its purpose is to support the fan, booster and high pressure compressor (HPC) rotors, and to provide ducting for primary and secondary airflows.
Fan Frame Assembly (sheet 1 of 3)The fan frame module consists of the following major assemblies:
- Fan frame assembly.
- Fan Outlet Guide Vane (OGV) assembly.
2. Fonctions
The Fan Frame and Fan Case perform the following primary functions:
The Fan Frame and Fan Case perform the following primary functions:
A. Fan Frame.
(1) An inlet airflow path to the core engine.
(2) A support for loads of the fan stator, fan rotor and fan reverser.
(3) Containment of accessory drive power take off gearing and shaft.
(4) A variable bypass valve system.
(5) Housing for service lines for lubrication of bearings, inlet gearbox and scavenge of the "A" sump.
(6) Support for the fan OGVs and fan inner flowpath acoustic panels.
B. Fan Case.
(1) Provides for attachment of the engine inlet cowl and the support and transmission of attachment loads from this point to the fan frame.
(2) Provides fan blade containment.
(3) Provides attachment points for acoustical panels.
(4) Provides an abradable microballon shroud for fan blade tips.
3. Description
A. Fan Frame Assembly
The fan frame assembly is a fabicated structural weldment constructed of concentric rings connected by radial struts. It consists of the basic fan frame structure and the fan inlet case.
The fan frame assembly is a fabicated structural weldment constructed of concentric rings connected by radial struts. It consists of the basic fan frame structure and the fan inlet case.
(1) The basic fan frame structure is made of steel alloy. It consists of a hub, mid box structure and outer casing interconnected through 4 thick and 8 thin radial struts.
(a) Structural strength for the fan frame is obtained from the 12 struts. The struts are hollow and provide passage for the following equipment :
1 No. 1 bearing vibration sensor cable (No. 4 strut).
2 N1 speed sensor and drain cavity (No. 6 strut).
3 Transfer Gearbox (TGB) radial drive shaft and scavenge tube (No. 7 strut).
4 Forward sump oil supply tube (No. 10 strut).
(b) The hub front face supports the No. 1 and No. 2 bearing support. The rear face supports, from front to rear, the IGB and No. 3 bearing module and the rear stationary air/oil seal together with its pressurization air supply ring. The hub outer surface, which is also the inner wall of the primary airflow annulus, has orifices for bleed air requirements.
(c) The mid box structure is located radially half-way between the primary and secondary airflows. It houses the 11 Variable Bleed Valve (VBV) ballscrew actuators and the VBV master ballscrew actuator. The front face of the structure supports the rear flanges of the stage 4 booster vane assembly, and the fan OGV support aft fairing (or OGV assembly inner shroud). The structure rear face supports the HPC forward case, the VBV hydraulic fuel gear motor and provides for engine mounting.
(d) The inner surface of the outer wall for the secondary airflow. Located on the outer surface of the casing are the front engine mounts, 2 ground handling mounts and the TGB mounting pad. The fan inlet case mounts to the outer casing front flange, and the fan discharge duct mounts to the outer casing rear face.
(2) The fan inlet case is a fabricated structural weldment made of steel alloy. The case is bolted to the fan frame outer front flange. The case outer surface has flanges and ribs to provide additional strength to the case during engine operation. It also has 2 hoisting points for engine ground handling purposes (2 and 10 o'clock positions), 2 Accessory Gearbox (AGB) mounts and various other mounting provisions for engine equipment. The inner surface is lined with 6 fan forward acoustical panels, one abradable shroud located radially in line with the fan rotor blades, 6 fan mid acoustical panels, the fan OGV assembly and 12 aft acoustical panels. The engine air intake cowl is attached to the front flange of the fan inlet case.
4. Fan Outlet Guide Vane Assembly (OGV)
The fan OGV assembly is made of aluminum alloy. It consists of an OGV aft support fairing (inner shroud) and individual vanes.
The fan OGV aft support fairing rear flange is bolted to the fan frame. Its outer surface contains 70 apertures to allow passage of the vane inner platforms and one port for borescope inspection. The fan splitter fairing is attached to the forward end of inner shroud.
The fan OGV assembly has 70 individual vanes. The vane inner platforms are axially retained by the inner face of the fan (OGV) aft support fairing. The vane outer platforms are bolted to the fan case.
The fan OGV assembly is made of aluminum alloy. It consists of an OGV aft support fairing (inner shroud) and individual vanes.
The fan OGV aft support fairing rear flange is bolted to the fan frame. Its outer surface contains 70 apertures to allow passage of the vane inner platforms and one port for borescope inspection. The fan splitter fairing is attached to the forward end of inner shroud.
The fan OGV assembly has 70 individual vanes. The vane inner platforms are axially retained by the inner face of the fan (OGV) aft support fairing. The vane outer platforms are bolted to the fan case.