TASK 72-42-31-840-002 No. 4 Bearing Support - Provide A New Support Assembly With Increased Durability, Rework-002 - SBE 72-0112

DMC:V2500-A0-72-42-3100-01A-933A-C|Issue No:001.00|Issue Date:2013-11-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 72-42-31-840-002 No. 4 Bearing Support - Provide A New Support Assembly With Increased Durability, Rework-002 - SBE 72-0112

Effectivity

FIG/ITEM PART NO.

01-010

2A0846

01-010

2A2038

General

The practices and procedures referred to in the procedure by the TASK number are in the SPM.

Refer to the indicated Service Bulletin for specific application requirements.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-42-31-040-051 Remove the No. 4 Bearing Front Compartment

      1. Remove the No. 4 bearing front compartment.

      1. Do the procedure given in TASK 72-42-00-040-001.

    2. SUBTASK 72-42-31-040-052 Remove the No. 4 Bearing Support Assembly

      1. Remove the No. 4 bearing support assembly.

      1. Do the procedure given in TASK 72-42-30-040-001.

    3. SUBTASK 72-42-31-350-053-001 Rework the No. 4 Bearing Support Assembly for Engine Serial Numbers V0090, V0092, V0097, V0098, C0099 and V0101 through V0188 Except Engine Serial Numbers V0118, V0181, V0183, V0185 and V0187

    1. Do an inspection of the 2A2038 No. 4 bearing support assemblies with the manufacturing serial numbers 0001, 0002, 0012, 0014 through 0031, 0042, 0043 and 0052. Also do the inspection on the 2A2038 bearing supports that were reworked by SBE 72-0040, TASK 72-42-31-840-001 as follows:

      2. Check the bearing support for a 40 HRC or equivalent hardness.

      1. Refer to Figure and Figure requirements.

        Do the hardness check on a stationary machine that will correctly support the part.

        Do the hardness test on the radius at any five of 12 positions given in the figure.

        Do the hardness test 0.100in. (2.54 mm) from the hole edges.

      3. If the hardness is 40 HRC or more, mark the new part number adjacent to the part number that was there before.

      1. NUMBER BEFORE: 2A3038.

        NEW NUMBER: 2A2461.

        Refer to Figure and Figure requrements.

        Do the procedure given in TASK 70-09-00-400-501 and use the vibration peen method.

        Remove any high metal caused by the test. Keep the surface finish requirements given in the figure.

      4. If the hardness is less than 40 HRC, replace the 2A2038 No. 4 bearing support assembly with a 2A2064 No. 4 bearing support assembly.

      1. Refer to Figure.

      5. Replace all the 2A2038 No. 4 bearing support assemblies without the manufacturing serial numbers 0001, 0002, 0012, 0014 through 0031, 0042, 0043 and 0052 with a 2A2064 No. 4 bearing support assembly.

      1. Refer to Figure.

    4. SUBTASK 72-42-31-350-053-002 Rework the No. 4 Bearing Support Assembly Before Engine Serial Numbers V0101 and Engine Serial Number V0118 Except Engine Serial Numbers V0090, V0092, V0097, V0098 and V0099

      1. Do a rework on the 2A0846 No. 4 bearing support assemblies only if the part has 2800 engine cycles or less and identify as follows.

      1. Do the procedure given in SBE 72-0040, TASK 72-42-31-840-001.

      2. Mark the new part number adjacent to the part number that was there before.

      1. NUMBER BEFORE: 2A0846.

        NEW NUMBER: 2A2461.

        Refer to Figure and Figure.

        Do the procedure given in TASK 70-09-00-400-501 and use the vibration peen method.

      3. Replace all the 2A0846 No. 4 bearing support assemblies with more than 2800 engine cycles with a 2A2064 No. 4 bearing support assembly.

      1. Refer to Figure.

    5. SUBTASK 72-42-31-440-051 Assemble the No. 4 Bearing Front Compartment Parts

      1. Assemble the No. 4 bearing front compartment parts and install a 2A2064 No. 4 bearing support assembly or a 2A2461 No. 4 bearing support assembly.

      1. Do the procedure given in TASK 72-42-30-440-001.

    6. SUBTASK 72-42-31-430-051 Assemble the Diffuser and Combustion Group

      1. Install the No. 4 bearing front compartment.

      1. Do the procedure given in V2500-A0-72-42-0000-00A-710A-B.

    7. Figure: Location of the No. 4 bearing support assembly

    Location of the No. 4 bearing support assembly

    Figure: No. 4 bearing support inspection and identification areas

    No. 4 bearing support inspection and identification areas

    Figure: No. 4 bearing support inspection and identification areas

    No. 4 bearing support inspection and identification areas

    Figure: Location of No. 4 bearing support assembly

    Location of No. 4 bearing support assembly

Requirements After Job Completion

Follow-On Conditions

NONE