TASK 72-50-41-300-008 LPT Shaft - Apply Chromium Plating, Repair-008 (VRS1502)

DMC:V2500-A0-72-50-4101-04A-647A-C|Issue No:003.00|Issue Date:2015-02-01

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 72-50-41-300-008 LPT Shaft - Apply Chromium Plating, Repair-008 (VRS1502)

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.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Vibrating marking pencilLOCALVibrating marking pencil
Grinding machineLOCALGrinding machine
Magnetic particle inspection equipmentLOCALMagnetic particle inspection equipment
Chromium plate equipmentLOCALChromium plate equipment

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-41-330-058 Machine Worn Diameter D1

    1. Refer to: Figure

      NOTE

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

      2. Grind off the damaged diameter to 3.7280 to 3.7381 in. (94.690 to 94.949 mm) diameter keep material removal to a minimum.

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

    2. SUBTASK 72-50-41-370-055 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 72-50-41-240-066 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 72-50-41-330-059 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 plating area.

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

    5. SUBTASK 72-50-41-380-057 Alkali Clean the LP Turbine Shaft

      1. Alkali Clean the LP Turbine Shaft.

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

    6. SUBTASK 72-50-41-330-060 Chromium Plate the LP Turbine Shaft

      1. Immerse the part in a standard chromium plating solution for sufficient time to achieve the diameter 3.75 in. (95.20 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 72-50-41-370-056 Bake the LP Turbine Shaft after Plating

    1. Bake the plated part as soon as possible (not later than 16 hours after plating). Hours: 3 hours minimum. Temperature: 374 to 410 deg F (190 to 210 deg C).

    8. SUBTASK 72-50-41-220-086 Examine the LP Turbine Shaft after Plating

    1. Refer to: Figure

      2. Visually examine the chromium deposit for the following:

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

        NOTE

        Pits
        Visible cracks
        Burning
        Excessive build-up of corner

      3. Dimensional check the plated area for diameter 3.75 in. (95.20 mm).

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

    9. SUBTASK 72-50-41-320-053 Grind the LP Turbine Shaft after Plating

    1. Refer to: Figure

      2. Grind the plated area by normal grinding wheel to specified dimensions.

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

    10. SUBTASK 72-50-41-230-056 Examine the LP Turbine Shaft after Grinding

    1. Refer to: Figure

      2. Visually examine the ground area for pits, cracks.

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

    3. Dimensional check the ground area.

    11. SUBTASK 72-50-41-380-058 Mark Repair Number on the LP Turbine Shaft

      1. Write the VRS1502 adjacent to part number.

      1. Use vibrating marking pencil :epl2.

    12. Figure: Apply chromium plating - LP turbine shaft

    Apply chromium plating - LP turbine shaft

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised SPM task references. (PSComm CHC277BR)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
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Manufacturer Code:LOCAL
Tool Number:Magnetic particle inspection equipment
Tool Name:Magnetic particle inspection equipment
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