TASK 72-50-32-300-020 LPT Stage 4 Blade - Blend Repair On The Knife Edges, Repair-020 (VRS4198)

DMC:V2500-A0-72-50-3204-01A-649A-C|Issue No:003.00|Issue Date:2019-11-01

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 72-50-32-300-020 LPT Stage 4 Blade - Blend Repair On The Knife Edges, Repair-020 (VRS4198)

Effectivity

FIG/ITEM

PART NO.

01-150

3A0884

Material of component

DESCRIPTION

SYMBOL

MATERIAL

Stage 4 turbine blade

Inconel 713C

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
Dial caliperLOCALDial caliper
Illuminated comparator magnifierLOCALIlluminated comparator magnifier
Radius gage setLOCALRadius gage set

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-32-350-071 General Instructions for the Blend Repair of the Knife Edge Seals of the Stage 4 Turbine Blade (01-150)

      1. Blend the nicks, dents, or cracks on the knife edge seals of the stage 4 turbine blade.

      1. Use files and stones to remove the nicks, dents or cracks.

      2. Polish the blended areas.

      1. Use fine stones to make the blended surface as smooth as the initial surface. Edges and corners are not permitted.

    2. SUBTASK 72-50-32-350-072 Blend Repair the Knife Edge Seals of the Stage 4 Turbine Blade (01-150)

      NOTE

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

      2. The blend shapes are shown in Figure.

      3. Do not try to make straight bent knife edges.

      4. The total area of blends on each knife edge and on the set of blades must not be more than 0.124 sqin (80 sqmm). The repaired blades must be symmetrically distributed around the circumference.

      1. Blend repair the knife edges.

      1. The maximum permitted depth of the blend repair is 0.040in. (1.0 mm).

        For the blend ratios, refer to Figure.

    3. SUBTASK 72-50-32-230-066 Examine the Knife Edge Seals of the Stage 4 Turbine Blade (01-150) for Cracks

      1. Do the test for cracks.

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

        No cracks are permitted.

    4. SUBTASK 72-50-32-220-096 Do the Post Repair Inspection

      1. Examine the surface finish.

      1. The surface finish of all blended areas must be as good as the adjacent areas.

      2. Examine the blend repaired areas dimensionally.

      1. Measure the dimensions of the blended areas with Dial caliper.

        The limits are given in Step.

        Use Radius gage set to examine the radius at each blend repaired area.

        Refer to Figure.

    5. Figure: Blend repair the knife edge seals of the stage 4 turbine blade (01-150)

    Blend repair the knife edge seals of the stage 4 turbine blade (01-150)

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised task number. (Editorial)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Dial caliper
Tool Name: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