TASK 72-50-00-300-010 LPT Stage 6 Inner Air Seal - Blend Repair the Stage 6 Turbine Inner Air Seal, Repair 010 (VRS4627)

DMC:V2500-A0-72-50-0021-04A-649A-C|Issue No:004.00|Issue Date:2016-11-01

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 72-50-00-300-010 LPT Stage 6 Inner Air Seal - Blend Repair the Stage 6 Turbine Inner Air Seal, Repair 010 (VRS4627)

Effectivity

FIG/ITEM

PART NO.

01-0240

3A3047

Material of component

IAE

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 numbers are in the SPM.

NOTE

For more equipment and materials necessary to do this repair refer to SPM TASK 70-23-05-230-501, SPM TASK 70-35-21-350-501 and SPM TASK 70-35-19-350-501. Equivalent equipment may be used.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-00-350-002 Blend Repair the Stage 6 Turbine Inner Air Seal

      NOTE

      Refer to TASK 70-35-21-350-501 for blending surface damage. For local blending use a length to depth ratio of 100:1 minimum, refer to Figure. If there is a number of damage marks close together blend the whole area to the specified depth. No more than 25 blends are permitted. Tell IAE if more than 25 blends are necessary. For direction of blend repair, where specified, refer to Figure. Area A2 must not be blended by this repair.

    1. Refer to Figure and Figure.

      2. Blend repair in area A1.

      1. Maximum permitted blend repair depth is 0.005 in. (0,13 mm), maximum permitted length of blends for scratches and scores is 0.500 in. (12,70 mm).

      2. Minimum distance between blends 0.500 in. (12,70 mm).

      3. For damage outside the spacing limits maximum blend repair depth is 0.003 in. (0,08 mm), maximum blend area is 0.25 sq in. (160,00 sq mm).

      3. Blend repair in area A3.

      1. Remove raised material only.

      4. Blend repair in area A4.

      1. Maximum permitted diameter of the holes is 0.538 in. (13,67 mm). Refer to SPM TASK 70-35-19-350-501.

      5. Blend repair in area A5 (without A5.1 and A5.2).

      1. Maximum permitted local blend repair depth is 0.004 in. (0,10 mm).

      6. Blend repair in area A5.1.

      1. Damage not more than 0.002 in. (0,050 mm) maximum depth to be blended to a 0.003 in. (0,08 mm) maximum depth.

      2. Blend to sufficient depth to remove damage plus an additional 0.001 in. (0,025 mm).

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

      4. Use a length to depth ratio of 15:1 minimum.

      7. Blend repair in area A5.2.

      1. Damage not more than 0.002 in. (0,050 mm) maximum depth to be blended to a 0.003 in. (0,08 mm) maximum depth.

      2. Blend to sufficient depth to remove damage plus an additional 0.001 in. (0,025 mm).

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

      4. Use a length to depth ratio of 15:1 minimum.

      8. Blend repair in area A6.

      1. Maximum permitted diameter of the holes is 0.193 in. (4,90 mm). Refer to SPM TASK 70-35-19-350-501.

      9. Blend repair in all other areas.

      1. Maximum permitted blend repair depth is 0.010 in. (0,25 mm).

      2. Minimum distance between blends is 0.500 in. (12,70 mm).

    2. SUBTASK 72-50-00-230-001 Examine the Blend Repaired Areas for Cracks

      1. Do the test for cracks.

      1. Refer to SPM TASK 70-23-04-230-501.

        .

      2. Use ultra high sensitivity level.

      3. No cracks are permitted.

    3. SUBTASK 72-50-00-380-001 Polish the Repaired Areas of Stage 6 Turbine Inner Air Seal

    1. Refer to Figure and Figure.

      2. Butterfly polish all repaired holes.

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

    4. SUBTASK 72-50-00-220-001 Do the Post Repair Inspection

    1. Refer to Figure, Figure and Figure.

      2. Examine the surface finish.

      1. The surface finish of all repairs must be 32 microinch RMS (0,8 micrometer Ra).

      3. Examine the blended areas dimensionally.

      1. The blend ratio must be in the limits.

    5. SUBTASK 72-50-00-350-003 Do the Post Repair

      1. Rebalance the stage 6 inner air seal.

      1. Refer to VRS4630, TASK 72-50-00-300-013 (REPAIR-013).

    6. Figure: Repair Details and Dimensions

    Repair Details and Dimensions

    Repair Details and Dimensions

    Figure: Repair Details and Dimensions

    Repair Details and Dimensions

Requirements After Job Completion

Follow-On Conditions

NONE
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