TASK 72-41-23-300-023 HPC Rear Outer Case - Repair By Skim Machining And Local Dressing, Repair-023 (VRS6528)

DMC:V2500-A0-72-41-2301-00A-659A-C|Issue No:005.00|Issue Date:2020-02-01

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 72-41-23-300-023 HPC Rear Outer Case - Repair By Skim Machining And Local Dressing, Repair-023 (VRS6528)

Effectivity

FIG/ITEM

PART NO.

ASSEMBLY

02-400

6A4154

A

02-400

6A5495

A

02-400

6A5682

A

02-400

6A8162

A

02-400

6B1427

A

Material of component

PART IDENT

MATERIAL

HP Compressor Rear

Outer Case

Corrosion Resistant Steel

General

This repair must only be done when the instruction to do so is given in the relevant inspection procedures (identified by the applicable part number) located in section 72-41-23.

This TASK gives the procedure to repair the surface damage on the HP compressor rear outer case by machining and dressing.

TASKs identified by SPM TASK are in the Standard Practices Manual (SPM).

Price and Availability

Refer to International Aero Engines

Related Repairs

Repair the HP Compressor Rear Outer Case by Replacing the Surface Protection, refer to repair, VRS6178 TASK 72-41-23-300-003 (REPAIR-003).

Replace Worn Location Pins in the HP Compressor Rear Outer Case Assembly, refer to repair, VRS6278 TASK 72-41-23-300-021 (REPAIR-021).

Replace Damaged Shank Nuts in the HP Compressor Rear Outer Case Assembly, refer to repair, VRS6279 TASK 72-41-23-300-011 (REPAIR-011).

Repair Damaged Helicoil or Thinwall Insert(s) in the HP Compressor Rear Outer Case Assembly by replacement, refer to repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

NOTE

Equipment and materials necessary to do this repair are in the SPM TASKs given below:
SPM TASK 70-09-00-400-501
SPM TASK 70-11-03-300-503
SPM TASK 70-11-05-300-503
SPM TASK 70-11-26-300-503
SPM TASK 70-23-02-230-501
SPM TASK 70-35-03-300-501

NOTE

  1. It is possible that some materials in the consumable materials chart cannot be used for some or all of the necessary applications. Before you use the materials, make sure the types, quantities and applications of the materials necessary are legally permitted in your location. All persons must obey all applicable federal, state, local and provincial laws and regulations when it is necessary to work with these materials.

  2. To identify the consumable materials refer to the Overhaul Processes and Consumables Index (PCI).

  3. Other necessary consumable materials are referred to in the SPM TASKS.

  4. Check if the part has been identified with VRS6528, to indicate previous accomplishment of this repair.

  5. If so, ensure damage surface(s) have sufficient machining allowance to permit damage removal.

  6. If not, proceed with the following repair procedure.

Preliminary Requirements

Pre-Conditions

Action/ConditionData Module/Technical Publication
Make sure that all the cleaning and inspection procedures are done before the repair.

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-41-23-220-182 Examine the Duct and Borescope Port Bosses, Assembly A

    1. Assembly A refer to Figure, Figure, Figure, Figure, Figure, Figure, Figure, Figure, Figure, Figure and Figure.

      2. Do a visual inspection for corrosion pitting damage.

      1. If damaged, continue from Step.

      2. If not damaged, continue from Step.

    2. SUBTASK 72-41-23-350-098 Remove the Thinwall Inserts from Duct and Borescope Port Bosses

      1. Remove the thinwall insert(s).

      1. Repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

    3. SUBTASK 72-41-23-220-183 Examine the Front and Rear Flanges Assembly A

    1. Refer to Figure, Figure, Figure and Figure.

      2. Do a visual inspection for surface damage.

      1. If damaged, continue from Step.

      2. If not damaged, continue from Step.

    4. SUBTASK 72-41-23-350-099 Remove the Shank Nuts

      1. Remove the shank nuts.

      1. Repair, VRS6279 TASK 72-41-23-300-011 (REPAIR-011).

    5. SUBTASK 72-41-23-350-100 Remove the Location Pins (Dowel)

      1. Remove the dowel pins.

      1. Repair, VRS6278 TASK 72-41-23-300-021 (REPAIR-021).

    6. SUBTASK 72-41-23-230-093 Do a Crack Test

      1. Do a local penetrant crack test of the repaired area(s).

      1. Refer to SPM TASK 70-23-02-230-501.

      2. Cracks are not permitted.

    7. SUBTASK 72-41-23-350-101 Machine the Surface Damage on Outer/Inner Front Flange and Rear Outer Flange Faces and Diameters, Assembly A

    1. Refer to Figure, Figure, Figure and Figure.

    2. Skim machine the damaged faces and diameters.

      3. Chamfer the holes again.

      1. In the following holes only:

      2. Inner flange rear face shank nut holes and/or.

      3. Rear flange rear face bolt holes and location hole.

    4. Remove sharp edges and/or burrs.

    8. SUBTASK 72-41-23-350-102 Machine the Surface Damage on Bolt and Shank Nut Holes, Assembly A

    1. Refer to Figure, Figure, Figure and Figure.

    2. Machine the damaged bores.

    3. Remove sharp edges and/or burrs.

    9. SUBTASK 72-41-23-350-103 Machine the Surface Damage on Duct and Borescope Port Bosses, Assembly A

    2. Skim machine the damaged duct and borescope boss faces.

      3. Machine the damaged borescope bores.

      1. Machine only the damaged bores.

        2. For Stage 7 borescope holes located at 151 degrees and 149.100 degrees.

          1. Machine to maximum hole sizes specified.

            1. If all pitting and/or damage is removed.

            1. Accept.

            2. If pitting and/or damage is still evident.

            1. Continue machining bore diameter up to 0.360 in. (9.14 mm).

              • If all pitting and/or damage is removed.

              • Restore the oversized hole(s). Refer to Repair, VRS9525 TASK 72-41-23-300-020 (REPAIR-020).

            2. If pitting and/or damage is still evident.

              • Reject.

        3. For all other borescope hole locations

          1. Machine to maximum hole sizes specified.

            1. If all pitting and/or damage is removed.

            1. Accept.

            2. If pitting and/or damage is still evident.

            1. Reject.

    4. Remove sharp edges and/or burrs.

    10. SUBTASK 72-41-23-110-089 Chemically Clean

      1. Chemically clean the part.

      1. Refer to SPM TASK 70-11-03-300-503.

    11. SUBTASK 72-41-23-350-104 Install the New Inserts, Assembly A

    1. Assembly A refer to Figure, Figure, Figure, Figure, Figure, Figure, Figure, Figure, Figure, Figure and Figure.

      2. Install the new inserts.

      1. Refer to repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

      2. Use thinwall inserts AS52761 and/or AS52762 as shown.

    3. NOTE

      Reduction of installed insert depth relative to boss face is permitted due to machining operation (Step).

    12. SUBTASK 72-41-23-220-184 Examine the Machine Repaired Area(s), Assembly A

      2. Do a visual inspection of the repaired area(s).

      1. If surface damage is removed, continue from Step.

        2. If surface damage is not removed from either front outer flange - inner face, rear outer flange - inner face, boroscope duct boss faces, duct boss faces.

        1. Remove the remaining damages by dressing and blending. Refer to Step.

      3. If surface damage is not removed from other machined areas, reject.

    13. SUBTASK 72-41-23-350-105 Remove the Remaining Damage by Dressing and Blending, Assembly A

      2. Locally blend to remove the indication of surface damage from machined repaired area(s).

      1. Refer to SPM TASK 70-35-03-300-501.

      2. The maximum depth of the blend repair area(s) to be 0.004 in. (0.10 mm).

      3. The diameter of the repaired area(s) to be 50 times the depth.

      4. Blend only the following faces to criteria specified.

        5. Front and rear outer flange end faces.

        1. Maximum 1 off blend per 2 off bolt hole pitch.

        2. It is not permitted for blend to breakout of flange face inner diameter.

        6. Front and rear outer flange inner faces.

        1. Maximum 1 off blend per 2 off bolt hole pitch.

        2. It is permitted for blend to breakout of flange face outer diameter and/or into bolt holes.

        7. Duct and borescope.

        1. Blend must not break out edge of boss face.

        2. Dress flush insert raised above boss faces.

    14. SUBTASK 72-41-23-220-185 Examine the Blend Repaired Area(s), Assembly A

      1. Do a visual inspection of the dressed area(s).

      1. If surface damage is removed , continue from Step.

      2. If surface damage is not removed from other machined areas, reject.

    15. SUBTASK 72-41-23-110-090 Chemically Clean

      1. Chemically clean the part.

      1. Refer to SPM TASK 70-11-03-300-503.

    16. SUBTASK 72-41-23-230-094 Do a crack Test

      1. Do a penetrant crack test of the repaired area(s).

      1. Refer to SPM TASK 70-23-02-230-501.

      2. Cracks are not permitted.

    17. SUBTASK 72-41-23-220-186 Examine the Repair, Assembly A

      2. Do a visual and dimensional inspection of the repaired area(s).

        1. Reject part if:

        1. Surface damage or corrosion remains evident.

        2. Machined features are not compliant with specified dimensions.

        3. Dressing criteria is not accomplished, refer to Step.

    18. SUBTASK 72-41-23-350-106 Install the New Shank Nuts

      1. Install the new shank nuts.

      1. Repair, VRS6279 TASK 72-41-23-300-011 (REPAIR-011).

    19. SUBTASK 72-41-23-350-107 Install the New Location Pins (Dowel)

      1. Install the new location pins (dowel).

      1. Repair, VRS6278 TASK 72-41-23-300-021 (REPAIR-021).

    20. SUBTASK 72-41-23-350-108 Identify the Repair

      1. Vibration peen VRS6528 adjacent to the part number.

      1. Refer to SPM TASK 70-09-00-400-501, SUBTASK 70-09-00-400-001.

    21. SUBTASK 72-41-23-380-060 Re-apply the Surface Protection

      1. Apply the surface protection.

      1. Refer to repair, VRS6178 TASK 72-41-23-300-003 (REPAIR-003).

    22. Figure: Repair Details and Dimensions - Assembly A

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Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised inspection criteria. (19VG096)