DOC AIRBUS | AMM A320FAFT MOUNT - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. Description
The aft mount connects the engine turbine rear frame with the engine pylon via a beam.
The aft mount takes the loads in the plane normal to the engine centerline, i.e. y, z loads and Mx. The aft mount is a damage tolerant design. It consists of 3 links and a crossbeam assembly.
There is a possibility of axial translation movement between the engine casing and the pylon since:
This allows for casing expansions of about 0.236 in. (6 mm) in cruise and 0.295 in. (7.5 mm) at maximum thrust,
The lugs are located on the upper part of the turbine rear frame. Their angular position is plus or minus 56.25 deg. for the lateral lugs and 11.25 deg. for the upper lug.
The aft mount consists of:
The lower attachment of each link has a bearing. It provides attachment to the engine casing lugs:
Each lug includes a bearing,
The cross beam has a mating face for connection with the engine pylon,
This attachment is made through 4 tension bolts and 2 shear pins,
One of the two shear pins is a back-up pin also used as an alignment pin,
The cross beam fitting is a fail-safe design: it consists of two lateral parts linked by shear pins.
The aft mount connects the engine turbine rear frame with the engine pylon via a beam.
Aft Engine MountThe aft mount takes the loads in the plane normal to the engine centerline, i.e. y, z loads and Mx. The aft mount is a damage tolerant design. It consists of 3 links and a crossbeam assembly.
There is a possibility of axial translation movement between the engine casing and the pylon since:
- the three links are located in the same plane normal to the engine centerline,
- the link end have bearings,
This allows for casing expansions of about 0.236 in. (6 mm) in cruise and 0.295 in. (7.5 mm) at maximum thrust,
The lugs are located on the upper part of the turbine rear frame. Their angular position is plus or minus 56.25 deg. for the lateral lugs and 11.25 deg. for the upper lug.
The aft mount consists of:
- 3 fail-safe links,
The lower attachment of each link has a bearing. It provides attachment to the engine casing lugs:
- a cross beam fitting,
Each lug includes a bearing,
The cross beam has a mating face for connection with the engine pylon,
This attachment is made through 4 tension bolts and 2 shear pins,
One of the two shear pins is a back-up pin also used as an alignment pin,
The cross beam fitting is a fail-safe design: it consists of two lateral parts linked by shear pins.