TASK 72-50-00-300-003 LPT Stage 6 Inner Air Seal - Blend Repair, Repair-003 (VRS4020)

DMC:V2500-A0-72-50-0021-01A-649A-C|Issue No:003.00|Issue Date:2018-02-01

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 72-50-00-300-003 LPT Stage 6 Inner Air Seal - Blend Repair, Repair-003 (VRS4020)

Effectivity

FIG/ITEM

PART NO.

01-240

3A0078

Material of component

RR

DESCRIPTION

SYMBOL

MATERIAL

Stage 6 turbine inner air seal

-

Inconel 718

General

Price and availability - none

The practices and processes and practices 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
Bore gageLOCALBore gage
Carbide tipped reamerLOCALCarbide tipped reamer
Crack detection kit (fluorescent)LOCALCrack detection kit (fluorescent)
Dial caliperLOCALDial caliper
External dial caliperLOCALExternal dial caliper
Illuminated comparator magnifierLOCALIlluminated comparator magnifier
Radius gage setLOCALRadius gage set
Roughness microtesterLOCALRoughness microtester
Unltraviolet lampLOCALUltraviolet lamp

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 05-113 EMERY POLISHING PAPERLOCALCoMat 05-113

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-00-350-053 General Instructions for the Blend Repair of the Stage 6 Turbine Inner Air Seal (01-240)

      1. Blend the scratches and scores of the stage 6 turbine inner air seal.

      1. Use files and stones to remove the scratches and scores.

      2. Polish the blended areas except holes and hole chamfers.

      1. Use fine stones and CoMat 05-113 EMERY POLISHING PAPER to make the blended surface as smooth as the initial surface.

        Edges and corners are not permitted.

    2. SUBTASK 72-50-00-350-054 Blend Repair the Stage 6 Turbine Inner Air Seal (01-240)

      NOTE

      1. Keep material removal to the minimum to remove damage.

      2. For local blending the length to depth ratio must be a minimum of 15:1 unless otherwise specified, refer to Figure.

      3. Unless stated differently there is no limit for the number of blends. If there is a number of damage marks close together blend the whole area to the specified depth.

      4. For direction of blend repair, where specified, refer to Figure.

      5. For blend repair of the two knife edge seals refer to the VRS4018 TASK 72-50-00-300-003 (REPAIR-003).

    1. Refer to Figure

      2. Blend repair in area A1.

      1. Maximum permitted depth of blend repair is 0.005in. (0.13 mm), maximum permitted length of blends for scratches and scores is 0.500in. (12.70 mm).

        Minimum distance between blends 0.500in. (12.70 mm).

        For damage outside the spacing limits maximum depth of blend repair is 0.003in. (0.08 mm), maximum blend area is 0.25sq in. (160.00 sq mm).

      3. Blend repair in area A2.

      1. Blend repair in this area is permitted, refer to NOTE 5 of this SUBTASK.

      4. Blend repair in area A3.

      1. Remove raised material only.

      5. Blend repair in area A4.

      1. Use carbide tipped reamer.

        Maximum permitted diameter of the holes is 0.538in. (13.67 mm).

        Remove only minimum material to get surface finish.

        Reproduce chamfer as necessary.

      6. Blend repair in area A5.

      1. Maximum permitted depth of local blends is 0.004in. (0.10 mm) except as follows in area A5.1 and A5.2 Figure.

      7. Blend repair in area A5.1.

      1. Maximum permitted depth of blend repair is 0.002in. (0.05 mm).

        The total area of blend repair must not be more than 30 percent of the total area A5.1.

      8. Blend repair in area A5.2.

      1. Maximum permitted depth of blend repair is 0.002in. (0.05 mm).

        The total area of blend repair must not be more than 50 percent of the total area A5.2.

      9. Blend repair in all other areas.

      1. Maximum permitted depth of blend repair is 0.010in. (0.25 mm).

        Length to depth blend ratio is 5:1 minimum.

        Minimum distance between blends is 0.500in. (12.70 mm), Figure.

    3. SUBTASK 72-50-00-230-053 Examine the Blend Repaired Areas A4 and A5 for cracks

    1. Refer to: Figure

      2. Do the test for cracks in area A4 and A5.

      1. Examine the blended areas, refer to the SPM TASK 70-23-05-230-501.

        No cracks are permitted.

        Use crack detection kit (fluorescent) and ultraviolet lamp.

    4. SUBTASK 72-50-00-380-051 Polish the Blended Areas A4 and A5

    1. Refer to: Figure

      2. Do the butterfly polishing in the blended Areas A4 and A5.

      1. Refer to the SPM TASK 70-35-19-350-501.

    5. SUBTASK 72-50-00-380-052 Polish All Other Blended Areas

    1. Refer to: Figure

      2. Do the polishing in all other blended areas.

      1. Use fine hand held stones to make the blended surfaces as smooth as the initial surfaces.

        Refer to the SPM TASK 70-35-19-350-501.

    6. SUBTASK 72-50-00-230-054 Do the Post Repair Inspection for Cracks

      1. Do the test for cracks.

      1. Examine the blended areas, refer to the SPM TASK 70-23-05-230-501.

        No cracks are permitted.

        Use crack detection kit (fluorescent) and ultraviolet lamp.

    7. SUBTASK 72-50-00-220-064 Do the Post Repair Inspection

      1. Examine the surface finish.

      1. The surface finish of all repairs must be 32 microinch RMS (0.8 micrometer ra).

        Use illuminated comparator magnifier and roughness microtester.

      2. Examine the reworked areas dimensionally.

      1. Make sure that dimensions are not more than maximum refer to Figure and to Figure.

        Use dial caliper, bore gage, radius gage set and external dial caliper.

    8. SUBTASK 72-50-00-350-055 Do the Post Repair

      1. Rebalance the stage 6 inner air seal.

      1. Refer to VRS4027, TASK 72-50-00-300-006 (REPAIR-006).

    9. Figure: Blend repair of the stage 6 turbine inner air seal

    Blend repair of the stage 6 turbine inner air seal

    Figure: Blend repair of the stage 6 turbine inner air seal

    Blend repair of the stage 6 turbine inner air seal

    Figure: Local blending length to depth ratio

    Local blending length to depth ratio

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Correct spelling error of word fluorescent (REA16VC131)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:KC1D9
Supply Number:CoMat 05-113
Type:sp01
Supply Short Name:CoMat 05-113 EMERY POLISHING PAPER
Supply Name:CoMat 05-113 EMERY POLISHING PAPER
Specification Groups:
Doc NumberType
FEPA GRIT SIZE P600 EMERY POLISHING PAPER OR ALUMINUM OXIDE ABRASIVE PAPER
Suppliers:
ManufacturerRemarks
KC1D9
LOCAL
Link not Found
Manufacturer Code:LOCAL
Tool Number:Carbide tipped reamer
Tool Name:Carbide tipped reamer
Manufacturer Code:LOCAL
Tool Number:Crack detection kit (fluorescent)
Tool Name:Crack detection kit (fluorescent)
Manufacturer Code:LOCAL
Tool Number:Dial caliper
Tool Name:Dial caliper
Manufacturer Code:LOCAL
Tool Number:External dial caliper
Tool Name:External dial caliper
Manufacturer Code:LOCAL
Tool Number:Illuminated comparator magnifier
Tool Name:Illuminated comparator magnifier
Manufacturer Code:LOCAL
Tool Number:Radius gage set
Tool Name:Radius gage set
Manufacturer Code:LOCAL
Tool Number:Roughness microtester
Tool Name:Roughness microtester
Manufacturer Code:LOCAL
Tool Number:Ultraviolet lamp
Tool Name:Unltraviolet lamp