TASK 72-50-00-840-001 LPT Stage 6 Inner Air Seal - Blend To Remove The Correlation Marking, Rework-001 - SBE 72-0089

DMC:V2500-A0-72-50-0021-03A-649A-C|Issue No:002.00|Issue Date:2013-11-01

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 72-50-00-840-001 LPT Stage 6 Inner Air Seal - Blend To Remove The Correlation Marking, Rework-001 - SBE 72-0089

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 referred to in the procedure by the TASK number are in the SPM.

NOTE

  1. More equipment and materials necessary to do this rework are given in the SPM TASK 70-23-05-230-501.

  2. Equivalent equipment may be used.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Illuminated comparator magnifierLOCALIlluminated comparator magnifier
Roughness microtesterLOCALRoughness microtester

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-00-350-058 General Instructions for the Identification of Correlation Marking

    1. Identify the correlation marking.

    2. SUBTASK 72-50-00-350-059 General Instructions for the Blend Repair of Correlation Marking

      1. Blend the correlation marking.

      1. Use files and stones to remove the correlation marking.

      2. Polish the blended area.

      1. Use files and fine stones to make the blended surface as smooth as the initial surface.

        Edges and corners are not permitted.

    3. SUBTASK 72-50-00-350-060 Blend Repair the Inner Air Seal

      NOTE

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

      2. For blending, the length to depth blend ratio is 5:1 minimum, refer to Figure.

      3. Blend repair in circumferential direction only.

      1. Blend repair to remove the correlation marking.

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

    4. SUBTASK 72-50-00-380-053 Polish the Blended Area

    1. Refer to: Figure

      2. Do the polishing.

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

    5. SUBTASK 72-50-00-230-060 Do the Post Repair Inspection for Cracks

    1. Refer to: Figure

      2. Do the test for cracks.

      1. Examine the blended area.

        Refer to the SPM TASK 70-23-05-230-501.

        No cracks are permitted.

    6. SUBTASK 72-50-00-220-074 Do the Post Repair Inspection

    1. Refer to: Figure

      2. Examine the surface finish.

      1. The surface finish of the blended area must be 32 microinch RMS (0.8 micrometer Ra).

        Use illuminated comparator and roughness microtester.

    7. Figure: Stage 6 turbine inner airseal, position of correlation marking

    Stage 6 turbine inner airseal, position of correlation marking

    Figure: Local blending length to depth ratio

    Local blending length to depth ratio

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial correction due to conversion

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Illuminated comparator magnifier
Tool Name:Illuminated comparator magnifier
Manufacturer Code:LOCAL
Tool Number:Roughness microtester
Tool Name:Roughness microtester