TASK 72-42-31-200-001 No. 4 Bearing Support - Examine, Inspection-001

DMC:V2500-A0-72-42-3100-00A-300A-B|Issue No:002.00|Issue Date:2015-11-01

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 72-42-31-200-001 No. 4 Bearing Support - Examine, Inspection-001

Effectivity

FIG/ITEM PART NO.

01-010

2A0846

01-010

2A2038

01-010

2A2064

01-010

2A2461

General

This TASK gives the procedure for the inspection of the No. 4 bearing support.

Fig/item numbers in parentheses in the procedure agree with those used in the IPC.

The policy that is necessary for inspection is given in the SPM TASK 70-20-00-200-501.

All the parts must be cleaned before any part is examined. Refer to the SPM TASK 70-10-00-100-501.

All parts must be visually examined for damage, corrosion and wear. Any defects that are not identified in the procedure must be referred to IAE.

The procedure for those parts which must have a crack test is given in SUBTASK 72-42-31-230-051. Do the test before the part is visually examined.

Do not discard any part until you are sure there are no repairs available. Refer to the instructions in Repair before a discarded part is used again or oversize parts are installed.

Parts which should be discarded can be held although no repair is available. The repair of a discarded part could be shown to be necessary at a later date.

All parts must be examined to make sure that all the repairs have been completed satisfactorily.

The practices and processes referred to in the procedure by the TASK numbers are in the SPM.

References

Refer to the SPM for data on these items.

Definitions of Damage SPM TASK 70-02-02-350-501

Record and Control of the Lives of Parts, SPM TASK 70-05-00-220-501

Inspection of Parts, SPM TASK 70-20-01-200-501

Some data on these items is contained in this TASK. For more data on these items refer to the SPM.

Method of Testing for Crack Indications

Chemical Processes

Surface Protection

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-42-31-230-051-001 Examine the No. 4 Bearing Support (01-010) for Cracks

    1. Clean the Part. Refer to the TASK 72-42-31-100-000 (CLEANING-000).

      2. Do the test for cracks on the part that is given below. Use the applicable penetrant procedure. Carefully examine the edges of the nine slots.

        PART IDENT

        TASK/SUBTASK

        No.4 Bearing Support

        TASK

        (Dip or Spray)

        1. Cracked

        1. Reject

    2. SUBTASK 72-42-31-230-051-002 Examine the No. 4 Bearing Support (01-010) for Cracks

    1. Clean the Part. Refer to the TASK 72-42-31-100-000 (CLEANING-000).

      2. Do the test for cracks on the part that is given below. Use the applicable penetrant procedure. Carefully examine the edges of the nine slots.

        PART IDENT

        TASK/SUBTASK

        No. 4 Bearing Support

        TASK

        (Dip or Spray)

        1. Cracked

        1. Reject

    3. SUBTASK 72-42-31-220-051 Examine the No. 4 Bearing Support (01-010) for Scoring and Damage on the Inside Diameter Bearing Bore Surface

    1. Refer to: Figure

      2. Examine the support at location 1 for scoring and damage on the inside diameter bearing bore surface.

        1. Scoring and damage.

          1. If there is no high metal and the scoring and damage is no more than 0.020 in. (0.508 mm) in width. The areas with damage must be no less than 1.0 in. (25.4 mm) apart. The damage must have a depth that is no more than 10 percent of the material thickness

          1. Accept

          2. Same as (a) but there is high metal

          1. Repair, VRS3078 TASK 72-42-31-300-007 (REPAIR-007)

          3. Other than (a) or (b)

          1. Repair, VRS3075 TASK 72-42-31-300-004 (REPAIR-004)

    4. SUBTASK 72-42-31-220-052 Examine the No. 4 Bearing Support (01-010) for Nicks, Burrs and Damage on the Bearing Race Retaining Threads

    1. Refer to: Figure

      2. Examine the support at location 2 for nicks, burrs and damage on the bearing race retaining threads.

        1. Nicks, burrs and damage.

          1. If you repaired less than 15 percent of the thread before

          1. Repair, VRS3078 TASK 72-42-31-300-007 (REPAIR-007)

          2. Other than (a)

          1. Reject

    5. SUBTASK 72-42-31-220-053 Examine the No. 4 Bearing Support (01-010) for Damage on the Jackscrew Hole Threads

    1. Refer to: Figure

      2. Examine the support at location 3 for damage on the jackscrew hole threads.

        1. Damage.

          1. Any amount if the holes are functional as jackscrew holes

          1. Accept

          2. Other than (a)

          1. Repair, VRS3274 TASK 72-42-31-300-008 (REPAIR-008)

    6. SUBTASK 72-42-31-220-054 Examine the No. 4 Bearing Support (01-010) Dowel Pin for Looseness or Damage

    1. Refer to: Figure

      2. Examine the support dowel pin at location 4 for looseness or damage.

        1. Looseness or damage

        1. Repair, VRS3275 TASK 72-42-31-300-009 (REPAIR-009)

    7. SUBTASK 72-42-31-220-055 Examine the No. 4 Bearing Support (01-010) for Nicks and Dents

    1. Refer to: Figure

      2. Examine the support at locations 5 and 6 for nicks and dents on the flange faces.

        1. Nicks and dents.

          1. If the nicks and dents are no more than 0.020 in. (0.508 mm) in width, no less than 1.0 in. (25.4 mm) apart, and no more than 10 percent of the material thickness in depth

          1. Accept

          2. Other than (a)

          1. Repair, VRS3078 TASK 72-42-31-300-007 (REPAIR-007)

      3. Examine the support on all surfaces other than locations 5 and 6 for nicks and dents.

        1. Nicks and dents.

          1. Up to 10 percent of the material thickness in depth, with no high metal

          1. Accept

          2. Other than (a)

          1. Repair, VRS3078 TASK 72-42-31-300-007 (REPAIR-007)

    8. SUBTASK 72-42-31-220-056 Examine the No. 4 Bearing Support (01-010) for the Axial Dimensions

    1. Refer to Figure.

      NOTE

      All dimensions apply when Surface C is flat by 0.001 in. (0.03 mm) in a held condition or 0.005 in. (0.13 mm) in a free condition, and Diameter M maintains a clearance envelope of 13.350 in. (339.09 mm) in a free or held condition. Diameter M must be 13,338 to 13.354 in. (338.79 to 339.19 mm). Hold the part only on Surfaces C, L, S and Diameter M.

      2. Examine the support at location 1 for the axial dimension of the bearing race stop to the rear flange.

        1. Axial dimension.

          1. If the dimension is between 2.844 and 2.848 in. (72.24 and 72.34 mm)

          1. Accept

          2. Other than (a)

          1. Repair, VRS3075 TASK 72-42-31-300-004 (REPAIR-004)

      3. Examine the support at location 2 for the axial dimension of the intermediate flange to the rear flange.

        1. Axial dimension.

          1. If the dimension is between 1.988 and 1.996 in. (50.50 and 50.70 mm)

          1. Accept

          2. Other than (a)

          1. Repair, VRS3072 TASK 72-42-31-300-001 (REPAIR-001)

    9. SUBTASK 72-42-31-220-057 Examine the No. 4 Bearing Support (01-010) for the Thickness of the Flanges

    1. Refer to: Figure

      2. Examine the support at location 3 for the thickness of the rear flange.

        1. Thickness.

          1. Between 0.178 and 0.182 in. (4.52 and 4.62 mm)

          1. Accept

          2. Other than (a)

          1. Repair, VRS3298 TASK 72-42-31-300-016 (REPAIR-016)

      3. Examine the support at location 4 for the thickness of the intermediate flange.

        1. Thickness.

          1. Between 0.138 and 0.142 in. (3.51 and 3.61 mm)

          1. Accept

          2. Other than (a)

          1. Repair, VRS3076 TASK 72-42-31-300-005 (REPAIR-005)

    10. SUBTASK 72-42-31-220-058 Examine the No. 4 Bearing Support Diameters

    1. Refer to Figure.

      NOTE

      All dimensions apply when Surface C is flat by 0.001 in. (0.03 mm) in a held condition or 0.005 in. (0.13 mm) in a free condition, and Diameter M maintains a clearance envelope of 13.350 in. (339.09 mm) in a free or held condition. Diameter M must be 13.338 to 13.354 in. (338.79 to 339.19 mm). Hold the part only on Surfaces C, L, S and Diameter M.

      2. Examine the support for the bearing bore diameter at location 2264.

        1. If the diameter is between 7.5522 and 7.5532 in. (191.826 and 191.851 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. Other than (1)

        1. Repair, VRS3075 TASK 72-42-31-300-004 (REPAIR-004)

      3. Examine the rear seal support diameter at location 2235.

        1. If the diameter is between 10.892 and 10.897 in. (276.657 and 276.784 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. Other than (1)

        1. Repair, VRS3074 TASK 72-42-31-300-003 (REPAIR-003)

      4. Examine the support rear cooling duct diameter at location 2233.

        1. If the diameter is between 12.748 and 12.754 in. (323.80 and 323.95 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. Other than (1)

        1. Repair, VRS3293 TASK 72-42-31-300-011 (REPAIR-011)

      5. Examine the support rear heatshield diameter at location 2234.

        1. If the diameter is between 12.998 and 13.002 in. (330.15 and 330.25 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. If the diameter is between 12.997 and 13.003 in. (330.124 and 330.276 mm)

        1. Accept part for select fit only

          NOTE

          This part can be used only if the mating part has a diameter that will result in fit of reference No. 2234. Refer to TASK 72-40-00-430-003 (ASSEMBLY-003) or TASK 72-00-43-420-001 (INSTALLATION-001).

        2. Write down the dimension of the diameter.

        3. Other than (1) or (2)

        1. Repair, VRS3295 TASK 72-42-31-300-013 (REPAIR-013)

      6. Examine the support turbine cooling air duct diameter at location 2263.

        1. If the diameter is between 13.027 and 13.033 in. (330.89 and 331.04 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. Other than (1)

        1. Repair, VRS3073 TASK 72-42-31-300-002 (REPAIR-002)

      7. Examine the support front cooling duct diameter at location 2055.

        1. If the diameter is between 12.748 and 12.754 in. (323.80 and 323.95 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. Other than (1)

        1. Repair, VRS3294 TASK 72-42-31-300-012 (REPAIR-012)

      8. Examine the support front heat shield diameter at location 2054.

        1. If the diameter is between 12.866 and 12.876 in. (326.80 and 327.05 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. Other than (1)

        1. Repair, VRS3296 TASK 72-42-31-300-014 (REPAIR-014)

      9. Examine the support diffuser case diameter at location 2056.

        1. If the diameter in a held condition is between 13.343 and 13.349 in. (338.91 and 339.07 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. If the diameter in a held condition is between 13.338 and 13.350 in. (338.79 and 339.09 mm)

        1. Accept part for select fit only

          NOTE

          This part can be used only if the mating part has a diameter that will result in fit of reference No. 2056. Refer to V2500-A0-72-42-0000-00A-710A-B (ASSEMBLY-001).

        2. Write down the dimension of the diameter.

        3. If the diameter in a free condition is between 13.338 and 13.354 in. (338.79 and 339.19 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        4. Other than (1), (2) or (3)

        1. Repair, VRS3297 TASK 72-42-31-300-015 (REPAIR-015)

      10. Examine the support front seal support diameter at location 2057.

        1. If the diameter is between 10.892 and 10.896 in. (276.657 and 276.758 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. Other than (1)

        1. Repair, VRS3292 TASK 72-42-31-300-010 (REPAIR-010)

    11. Figure: No. 4 Bearing Support Inspection Locations

    No. 4 Bearing Support Inspection Locations

    Figure: No. 4 Bearing Support Inspection Locations

    No. 4 Bearing Support Inspection Locations

    Figure: No. 4 Bearing Support Inspection Locations

    No. 4 Bearing Support Inspection Locations

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Added -001 to ASSEMBLY and INSTALLATION task references. (editorial)