TASK 72-50-41-300-004 LPT Shaft - Apply Chromium Plating, Repair-004 (VRS1498)

DMC:V2500-A0-72-50-4101-00A-647A-C|Issue No:004.00|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 72-50-41-300-004 LPT Shaft - Apply Chromium Plating, Repair-004 (VRS1498)

Effectivity

FIG/ITEM

PART NO.

01-200

5A0149

01-200

5A0864

01-200

5A0892

01-200

5A6147

01-200

5A1732

01-200

5A1762

Material of component

PART IDENT

SYMBOL

MATERIAL

LP turbine shaft

Non-corrosion resistant steel

General

Price and availability - none

The practices and processes referred 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
Vibrating Marking PencilLOCALVibrating Marking Pencil
Chromium Plate equipmentLOCALChromium Plate equipment
Magnetic particle inspection equipmentLOCALMagnetic particle inspection equipment
Grinding MachineLOCALGrinding Machine

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 05-019 WATERPROOF SILICON CARBIDE1E1X8CoMat 05-019
CoMat 05-020 WATERPROOF SILICON CARBIDELOCALCoMat 05-020

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-41-330-061 Machine Worn Diameter D1

      NOTE

      If the surface has been previously repaired using chromium plate, remove the old plating completely.

    1. Refer to: Figure

      2. Grind-off the damaged diameter to 3.534 to 3.544 in. (89.78 to 90.02 mm) diameter.

      1. Hold D1 to a maximum value, but any previous coating and damage must be completely removed.

        Use a universal grinding machine.

        NOTE

        Grind the snap diameter to the minimum diameter which is required before plating process if the damages are too deep to be removed by grinding.

      3. Make smooth and/or polish to remove all the remaining damages if the damages can't be removed by grinding in Step.

      1. Use portable grinding equipment, abrasive stones, fine file, CoMat 05-019 WATERPROOF SILICON CARBIDE and/or CoMat 05-020 WATERPROOF SILICON CARBIDE.

        Maximum depth to remove the remaining damages must not be more than 0.023 in. (0.60 mm).

        Width of the blended area is to be more than 10 times the depth.

        Total circumferential length of the blended area is not more than 10 percent of circumferential of the snap diameter.

        Remove minimum quantity of material necessary to remove the damages.

        Surface finish of the repair must be the same as the adjacent area.

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

    2. SUBTASK 72-50-41-370-057 Stress Relieve the LP Turbine Shaft after Plate Stripping

      1. Heat treat the part for one hour at 374 to 410 deg F (190 to 210 deg C).

      1. Refer to the SPM TASK 70-33-02-300-503.

    3. SUBTASK 72-50-41-240-064 Examine the LP Turbine Shaft for Cracks

      1. Magnetic particle examine the ground area.

      1. No cracks permitted.

        Refer to TASK 72-50-41-200-000 (INSPECTION-000).

    4. SUBTASK 72-50-41-330-062 Prepare the LP Turbine Shaft for Plating

      1. Clean the part.

      1. Refer to the SPM TASK 70-33-02-300-503.

      2. Mask all the surface except the plating area.

      1. Refer to the SPM TASK 70-38-24-300-503.

    5. SUBTASK 72-50-41-380-059 Alkali Clear the LP Turbine Shaft

      1. Alkali clear the part.

      1. Refer to the SPM TASK 70-33-02-300-503.

    6. SUBTASK 72-50-41-330-063 Chromium Plate the LP Turbine Shaft

      1. Immerse the part in a standard chromium plating solution for sufficient time to achieve the diameter 3.55 in. (90.20 mm) minimum.

      1. Refer to the SPM TASK 70-33-02-300-503.

      2. Treatment after plating.

      1. Refer to the SPM TASK 70-33-02-300-503.

    7. SUBTASK 72-50-41-370-058 Bake the LP Turbine Shaft after Plating

      1. Bake the plated part as soon as possible (not later than 16 hours after plating).

      1. Hours: 3 hours minimum.

        Temperature: 374 to 410 deg F (190 to 210 deg C).

    8. SUBTASK 72-50-41-220-087 Examine the LP Turbine Shaft after Plating

    1. Refer to: Figure

      2. Visually examine the chromium deposit for pits, visible cracks, burns and excessive build-up of a corner.

      1. Refer to TASK 72-50-41-200-000 (INSPECTION-000).

        The dimples which are caused by the blended area in Step are acceptable.

      3. Dimensional check the plated area for diameter 3.55 in. (90.20 mm) minimum.

      1. Refer to TASK 72-50-41-200-000 (INSPECTION-000).

    9. SUBTASK 72-50-41-324-054 Grind the LP Turbine Shaft after Plating

    1. Refer to Figure.

      2. Grind the plated area to the specified dimensions.

      1. Refer to the SPM TASK 70-33-02-300-503.

        Use a universal grinding machine.

      3. Make smooth and polish the dimples which are caused by the blended area in step 4.B.

      4. Remove loose materials or burrs from the edge of chamfer fully.

    10. SUBTASK 72-50-41-220-091 Examine the LP Turbine Shaft after Grinding

    1. Refer to Figure.

      2. Visually examine the ground area for pits or cracks after grinding.

      1. Refer to TASK 72-50-41-200-000 (INSPECTION-000).

        The dimples which are caused by the blended area in Step are acceptable.

    3. Dimensional check the area after grinding.

    11. SUBTASK 72-50-41-380-060 Mark Repair Number on the LP Turbine Shaft

      1. Write VRS1498 adjacent to the part number.

      1. Use a vibrating marking pencil.

    12. Figure: Repair Details and Dimensions

    Repair Details and Dimensions

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Correct step references and add links (CAS-55457-H2R8H8)

Manufacturer Code:1E1X8
Enterprise Name:SAINT-GOBAIN CERAMICS AND PLASTICS, INC
BU Name:SAINT-GOBAIN CERAMICS AND PLASTICS, INC
Street:1 NEW BOND ST
City:WORCESTER
State:MA
Zip Code:01606
Country:UNITED STATES OF AMERICA
Phone Number:1-508-795-5000, 1-800-243-0028
Fax Number:1-508-795-2380
Internet:www.saint-gobain-northamerica.com
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:1E1X8
Supply Number:CoMat 05-019
Type:sp01
Supply Short Name:CoMat 05-019 WATERPROOF SILICON CARBIDE
Supply Name:CoMat 05-019 WATERPROOF SILICON CARBIDE
Specification Groups:
Doc NumberType
OMAT: 5/31 (RR REF)WATERPROOF SILICON CARBIDE ABRASIVE PAPER, CAMI GRIT DESIGNATION 400 (ANSI B74.18)
JCR-184 (JAEC REF)
Suppliers:
ManufacturerRemarks
1E1X8
LOCAL
K6835
Manufacturer Code:1E1X8
Supply Number:CoMat 05-020
Type:sp01
Supply Short Name:CoMat 05-020 WATERPROOF SILICON CARBIDE
Supply Name:CoMat 05-020 WATERPROOF SILICON CARBIDE
Specification Groups:
Doc NumberType
OMAT: 5/33 (RR REF)WATERPROOF SILICON CARBIDE ABRASIVE PAPER, CAMI GRIT DESIGNATION 320 (ANSI B74.18)
JCR-027 (JAEC REF)
JCR-186 (JAEC REF)
Suppliers:
ManufacturerRemarks
1E1X8
LOCAL
K6835
Manufacturer Code:LOCAL
Tool Number:Chromium Plate equipment
Tool Name:Chromium Plate equipment
Manufacturer Code:LOCAL
Tool Number:Grinding Machine
Tool Name:Grinding Machine
Manufacturer Code:LOCAL
Tool Number:Magnetic particle inspection equipment
Tool Name:Magnetic particle inspection equipment
Manufacturer Code:LOCAL
Tool Number:Vibrating Marking Pencil
Tool Name:Vibrating Marking Pencil