DOC AIRBUS | AMM A320FMOUNTS - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The engine is attached to the aircraft pylon by two mount assemblies, one at the front and one at the rear of the engine.
The mount assemblies transmit loads from the engine to the aircraft structure.
Spherical bearings in each mount permit thermal expansion and some movement between the engine and the pylon.
Both mounts are made to be fail-safe and have a tolerance to damage.
** ON A/C NOT FOR ALL The engine is attached to the aircraft pylon by two mount assemblies, one at the front and one at the rear of the engine.
The mount assemblies transmit loads from the engine to the aircraft structure.
Spherical bearings in each mount permit thermal expansion and some movement between the engine and the pylon.
Both mounts are made to be fail-safe and have a tolerance to damage.
2. Component Location
The front mount is installed at the top center of the Low Pressure Compressor (LPC) case.
The rear mount is installed at the top center of the Low Pressure Turbine (LPT) case.
** ON A/C NOT FOR ALL The front mount is installed at the top center of the Low Pressure Compressor (LPC) case.
The rear mount is installed at the top center of the Low Pressure Turbine (LPT) case.
3. System Description
The engine mount system has these components:
** ON A/C NOT FOR ALL The engine mount system has these components:
- A front mount 1500KM,
- A rear mount 1550KM.
4. Component Description
Forward Engine Mount(1) The front mount has these parts:
(a) Two thrust links,
(b) A beam assembly,
(c) A cross beam assembly,
(d) A support bearing assembly.
(2) The thrust links attach to lugs on the cross beam and to the engine mount lugs on the LPC using solid pins. A spherical bearing is installed at each end of the links.
(3) The cross beam assembly connects to the beam assembly by a solid pin.
(4) The beam assembly is aligned on the aircraft pylon by two shear pins and attached with five bolts.
(5) The support bearing assembly is attached to the LPC case.
(6) The pins used to attach the thrust links and cross beam assembly are held in position by retainers, washers, nuts and bolts.
(1) The aft mount has these parts:
(a) Two side links.
(b) A center link.
(c) A beam assembly.
(2) The two side links attach to the beam assembly at one end and the engine aft mount ring on the LPT case at the other end.
(3) The links are attached by two pins, one solid and one hollow, at each attachment point. These pins are held in position by retainers, washers, nuts and bolts.
(4) Each end of the links has a spherical bearing installed.
(5) The aft mount is aligned on the pylon by two shearpins and is attached to the pylon by four bolts and washers.
5. Operation
(1) The thrust of the engine is transmitted through the thrust links, the cross beam assembly and the beam assembly to the aircraft pylon.
(2) Vertical and side loads are transmitted through the support bearing to the beam assembly and then to the aircraft pylon.
(3) The support bearing permits the engine to turn so that torsional loads are not transmitted to the aircraft structure.
(4) The front mount is made to be fail-safe. If one of the two thrust links or the cross beam should fail, then thrust loads are transmitted through the ball stop and into the beam assembly. The thrust is then transmitted to the pylon structure.
(1) Vertical and side loads are transmitted through the side links and beam assembly and into the pylon.
(2) Torsional loads are transmitted by the center link to the beam assembly and in to the pylon.
(3) The mount is made to be fail-safe. The side links are each made up of two parts which are attached together to make one unit. If one part of the link should fail, the remaining part will transmit the loads to the beam assembly.