TASK 72-40-00-300-004 No. 4 Bearing/HPT Nut - Blend Repair By Hand Stoning, Repair-004 (VRS3454)

DMC:V2500-A0-72-40-0012-00A-649A-C|Issue No:002.00|Issue Date:2016-05-01

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 72-40-00-300-004 No. 4 Bearing/HPT Nut - Blend Repair By Hand Stoning, Repair-004 (VRS3454)

Effectivity

FIG/ITEM

PART NO.

04-020

2A0145

04-020

2A2245

04-020

2A2247

Material of component

PART IDENT

IAE

SYMBOL

MATERIAL

Bearing retainig nut

Nickel alloy

General

Price and availability - none

If you did the procedure in Rework-001, TASK 72-40-00-840-001 (REWORK-001) to get PN 2A2247, you do not have to remove the eight plugs (PN 2A2248) to do this repair.

This repair must only be done when the instruction to do so is given in TASK 72-40-00-200-000 (INSPECTION-000).

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

NOTE

To identify the consumable materials refer to the PCI.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Workshop inspection equipmentLOCALWorkshop inspection equipment

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 05-106 ABRASIVE STONEK6835CoMat 05-106

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-40-00-330-051 Remove the Silver Plate and Anti-Galling Compound from the Bearing Retaining Nut

      1. Remove the silver plate and anti-galling compound from the retaining nut at location 7.

      1. SPM TASK 70-33-55-330-001 and Figure, Figure or Figure.

    2. SUBTASK 72-40-00-350-056 Remove the Damage on the Splines

      1. Hand stone to remove the burrs, scratches and surface damage at location 3.

      1. Refer to Figure, Figure or Figure.

      3. Remove all of the high material necessary to smooth out the defects.

      4. Hand stone any nicks that exceed the inspection limits.

      5. You are permitted to stone the full length of the spline.

      6. Up to five splines can be repaired.

      7. A repaired spline must be isolated by five splines that are not repaired.

    3. SUBTASK 72-40-00-160-051 Clean the Splines after the Repair

      1. Clean the splines at location 3.

      1. Refer to Figure, Figure or Figure

      2. Remove all loose metal and material from the splines and adjacent area that was caused by the stoning repair.

      3. Use compressed air.

    4. SUBTASK 72-40-00-220-113 Examine the Repaired Splines

      1. Do a visual and dimensional inspection at location 3.

      1. Refer to Figure, Figure or Figure.

      2. Accept the repairs that are smooth and up to 0.020 in. (0.508 mm) in depth.

      3. The ratio of length along the splines to the depth must be a minimum of 10.

      4. Make sure that no high material remains on the splines after the repair.

    5. SUBTASK 72-40-00-350-057 Remove the Damage on the Front Face

      1. Hand stone to remove all the burrs and pick-up at location 9.

      1. Refer to Figure, Figure or Figure.

      3. You must do the hand stoning in a circumferential direction.

      4. Make a continuous smooth surface and up to 0.003in. (0.076 mm) below the surface.

      5. Up to 20 percent of the total surface area on the front face can be repaired by stoning.

      6. You must repair all the galling, nicks and scratches on the front face by Repair, VRS3010 TASK 72-40-00-300-005 (REPAIR-005).

    6. SUBTASK 72-40-00-160-052 Clean the Front Face after the Repair

      1. Clean the front face at location 9.

      1. Refer to Figure, Figure or Figure.

      2. Remove all loose metal and material from the front face and adjacent areas that was caused by the stoning repair.

      3. Use compressed air.

    7. SUBTASK 72-40-00-220-114 Examine the Repaired Front Face

      1. Do a visual and dimensional inspection at location 9.

      1. Refer to Figure, Figure or Figure.

      2. Accept the repairs that are smooth and up to 0.003in. (0.076 mm below the surface.

      3. The ratio of the circumferential length to depth must be a minimum of 10.

      4. The circumferential length of a stoned area up to 0.500in. (12.7 mm).

      5. The minimum length between the repaired areas must be 1.00in. (25.4 mm) or more.

    8. SUBTASK 72-40-00-350-058 Remove the Damage on the Front Inner Diameter

      1. Hand stone to remove all the burrs from the lugs at location 6.

      1. Refer to Figure, Figure or Figure.

      3. You must do the hand stoning in a circumferential direction.

      4. Make a continuous smooth surface and up to 0.003in. (0.076 mm) below the surface.

      5. You can stone the full axial and circumferential length of the lug surface.

      6. The front inner diameter is not a continuous surface.

      7. The total surface area consists only of the contact surface on the lugs.

      8. The cooling slots and holes are not included.

      9. Up to 20 per cent of the total surface area on the front inner diameter can be repaired by hand stoning.

      10. Two repaired lugs must be divided by a minimum of one lug that is not repaired.

      11. Repair all galling or pick up on the front inner diameter by repair, VRS3489 TASK 72-40-00-300-010 (REPAIR-010).

    9. SUBTASK 72-40-00-160-053 Clean the Front Inner Diameter after the Repair

      1. Clean the front inner diameter at location 6.

      1. Refer to Figure, Figure or Figure.

      2. Remove all loose metal and material from the front inner diameter and adjacent areas that was caused by the stoning repair.

      3. Use compressed air.

      4. Make sure the cooling slots are clear of material from the stoning repair.

    10. SUBTASK 72-40-00-220-115 Examine the Front Inner Diameter after the Repair

      1. Do a visual and dimensional inspection on the repaired lugs at location 6.

      1. Refer to Figure, Figure or Figure.

      2. Accept repairs that are smooth and up to 0.003 in. (0.076 mm) below the surface.

      3. Make sure no high material remains on the front snap diameter.

      2. Do a dimensional inspection of the front inner diameter on the lugs that are not repaired at location 6.

        1. Refer to Figure, Figure or Figure.

        1. The diameter must be between 4.823 and 4.825 in. (122.505 and 122.555 mm).

    11. SUBTASK 72-40-00-350-059 Remove the Damage at All Other Areas

      1. Hand stone to remove all the surface damage at location 1, 4 and 5. This includes all high material, nicks, and scratches that exceed the inspection depth.

      1. Refer to Figure, Figure or Figure.

      3. You must do the hand stoning in a circumferential direction.

      4. Blend up to 0.010 in. (0.254 mm) in depth.

      5. Remove the minimum quantity of material when you make the damaged surface smooth.

      6. Up to 20 percent of the total surface area can be repaired by hand stoning.

    12. SUBTASK 72-40-00-160-054 Clean the Repaired Areas

      1. Clean the repaired areas at locations 1, 4 and 5.

      1. Refer to Figure, Figure or Figure.

      2. Remove all loose metal and material from the blended areas that was caused by the stoning repair.

      3. Use compressed air.

    13. SUBTASK 72-40-00-220-116 Examine the Repaired Areas

      1. Do a visual and dimensional inspection at locations 1, 4 and 5.

      1. Refer to Figure, Figure or Figure.

      2. Accept repairs that are smooth and up to 0.010 in. (0.254 mm) in depth.

      3. The ratio of the length in a circumferential direction to depth must be a minimum of 10.

      4. The length of a blended area must not be more than 0.600 in. (15.24 mm).

      5. The minimum length between the repaired areas in all directions must be 1.00 in. (25.4 mm) or more.

    14. SUBTASK 72-40-00-350-073 Remove the Damage on the Threads

      1. Remove burrs, scratches and surface damage at location 8 by hand stoning.

        1. Refer to Figure, Figure or Figure.

        2. Remove minimum amount of material necessary to smooth out defects.

        3. You are permitted to remove a maximum of 10 percent of threads by blending.

    15. SUBTASK 72-40-00-160-056 Clean the Threads after the Repair

      1. Clean threads at location 8.

      1. Refer to Figure, Figure or Figure.

      2. Remove all loose metal and material from threads and adjacent area of stoning repair.

      3. Use dry compressed air.

    16. SUBTASK 72-40-00-220-164 Examine the Repaired Threads

      1. Do a visual and dimensional inspection at location 8.

      1. Refer to Figure, Figure or Figure.

      2. Ratio length along the threads to the depth must be a minimum of 10.

      3. Make sure that no high material remains on threads after repair.

    17. SUBTASK 72-40-00-350-060 Identify the Repair

      1. Make a mark VRS3454 adjacent to the part number.

      1. Refer to Figure, Figure or Figure.

      2. Make a permanent mark by SPM TASK 70-09-00-400-501.

      3. Electrical contact permitted only at location 2.

    18. SUBTASK 72-40-00-330-052 Plate the Bearing Retaining Nut with the Silver Plate and Treat with Anti-Galling Compound

      1. Plate the bearing retaining nut with the silver plate and treat with anti-galling compound.

      1. Refer to VRS3011 TASK 72-40-00-300-006 (REPAIR-006).

    19. Figure: Bearing retaining nut (PN 2A0145 and 2A2247) hand stoning

    Bearing retaining nut (PN 2A0145 and 2A2247) hand stoning

    Figure: Bearing retaining nut (PN 2A2245) hand stoning

    Bearing retaining nut (PN 2A2245) hand stoning

    Figure: Bearing retaining nut (2A2247, re-operated from 2A0145 per SBE 72-0095) hand stoning

    Bearing retaining nut (2A2247, re-operated from 2A0145 per SBE 72-0095) hand stoning

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedure, figures 1, 2 and added figure 3. (15VC538)

Manufacturer Code:K6835
Enterprise Name:MED-LAB LTD
BU Name:MED-LAB LTD
Street:COPELAND ST
City:DERBY
Zip Code:DE1 2PU
Country:GREAT BRITAIN
Phone Number:44-1332-349094
Fax Number:44-1332-371237
Email:sales@med-lab.co.uk
Internet:www.med-lab.co.uk
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:K6835
Supply Number:CoMat 05-106
Type:sp01
Supply Short Name:CoMat 05-106 ABRASIVE STONE
Supply Name:CoMat 05-106 ABRASIVE STONE
Specification Groups:
Doc NumberType
(SS-S-736/2/26) (A-A-3068/2-26)SQUARE FINE SS-S-736 TYPE II CLASS A1
Suppliers:
ManufacturerRemarks
K6835
KC1D9
Manufacturer Code:LOCAL
Tool Number:Workshop inspection equipment
Tool Name:Workshop inspection equipment