TASK 72-50-33-300-053 LPT Stage 4 Rotating Airseal - Blend Repair, Repair-053 (VRS4461)

DMC:V2500-A0-72-50-3304-03A-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 72-50-33-300-053 LPT Stage 4 Rotating Airseal - Blend Repair, Repair-053 (VRS4461)

Effectivity

FIG/ITEM

PART NO.

01-150

3A2422

Material of component

PART IDENT

SYMBOL

MATERIAL

Stage 4 turbine air seal

-

MTS1387A/IN100 MOD

General

Price and availability - none

The practices and processes referred to in the procedure by the TASK numbers are in the SPM.

Repair Facilities

The Source Demonstration requirements of this repair means that any facility not authorized to accomplish this repair either, utilize the Authorized Repair Vendors listed below or contact the IAE Repair Services Group to determine if a qualification program can be initiated at their facility.

IAE INTERNATIONAL AERO ENGINES AG
400 Main Street, M/S 121-10
East Hartford, CT 06108
USA
Attn: Manager Repair Services
Authorized Repair Vendors for Shotpeen Repair VRS4461 TASK 72-50-33-300-053 (REPAIR-053) are listed below
MTU AERO ENGINES GMBH
Dachauer Strasse 665
80995 Muenchen
Germany
The designation by IAE of an authorized repair vendor indicates that the repair vendor has demonstrated the necessary capability to enable him to carry out the listed repair work. However, IAE make no warranties or representations concerning the qualifications or quality standards of the repair vendors to carry out the repair work and accepts no responsibility whatsoever for any work that may be carried out by a repair vendor, other than when IAE is listed as the repair vendor. Authorized repair vendors do not act as agents or representatives of IAE.
NOTE
For equipment and materials necessary to do this repair, refer to SPM  TASK 70-23-05-230-501, SPM TASK 70-35-19-350-501, SPM TASK 70-35-21-350-501 and SPM TASK 70-38-13-380-501.
Preliminary Requirements
Pre-Conditions
NONE
Support Equipment
NameManufacturerPart Number / IdentificationQuantityRemark
Silicon impression materialLOCALSilicon impression material
Carbide tipped reamerLOCALCarbide tipped reamer
Consumables, Materials and Expendables
NONE
Spares
NONE
Safety Requirements
NONE
Procedure
    1. SUBTASK 72-50-33-350-153 Blend Repair of the Stage 4 Turbine Air Seal
      NOTE
      Refer to SPM 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 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.
      Do not blend the coated knife edge seals using this repair.
      For direction of blend repair, where specified, refer to Figure and Figure.
      1. Blend repair in area A1.
      1. Maximum permitted depth of blend repair is 0.010 in. (0.25 mm).
        Minimum distance between blends is 0.500 in. (12.70 mm).
      2. Blend repair in area A2.
      1. Use carbide tipped reamer.
        Maximum permitted diameter of the holes is 0.2717 in. (6.90 mm).
        Remove only minimum material to achieve surface finish.
        Round bottom dents to a maximum depth of 0.005 in. (0.127 mm) are permitted in the lead-in radii, without blendings, provided any raised material is removed.
      3. Blend repair in area A3.
      1. Maximum permitted depth of local blends (nicks and dents) is 0.004 in. (0.10 mm).
        Maximum permitted depth of blends for scratches and scores is 0.002 in. (0.05 mm) without the areas given in steps D and E.
      4. Blend repair in area A3.1.
      1. Maximum permitted depth of blend repair is 0.002 in. (0.05 mm).
        The total area of blend repair must not be more than 30 per cent of the whole area A3.1.
      5. Blend repair in area A3.2.
      1. Maximum permitted depth of blend repair is 0.002 in. (0.05 mm).
        The total area of blend repair must not be more than 50 per cent of the whole area A3.2.
      6. Blend repair in area A4.
      1. Maximum permitted depth of blend repair is 0.002 in. (0.05 mm).
        Maximum permitted length of individual blends is 1.65 in. (42.00 mm).
        No more than four blends are permitted, spaced one per quadrant.
      7. Blend repair in area A5.
      1. Remove raised material only.
      8. Blend repair in area A6.
      1. Maximum permitted depth of blend repair is 0.005 in. (0.13 mm).
        Maximum permitted length of blends for scratches and scores is 0.75 in. (19.10 mm).
        Minimum distance between blend is 0.500 in. (12.70 mm).
        For damage outside the spacing limit maximum depth of blend repair is 0.003 in. (0.08 mm).
        Maximum blend area is 0.25 sqin. (160.00 sq mm).
    2. SUBTASK 72-50-33-230-154 Examine the Blended Areas for Cracks
      1. Do the test for cracks.
      1. Refer to the SPM TASK 70-23-05-230-501.
        Use ultra high sensitivity level.
        No cracks are permitted.
    3. SUBTASK 72-50-33-320-101 Polish the Repaired Holes of the Stage 4 Turbine Air Seal
    1. Refer to: Figure and Figure
      2. Butterfly polish all the repaired holes.
      1. Refer to the SPM TASK 70-35-19-350-501.
    4. SUBTASK 72-50-33-220-139 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).
      2. Examine the blended areas dimensionally.
      1. Measure the dimensions of the blended areas.
        Refer to Figure and Figure.
        The blend ratio must be in the limits.
        NOTE
        If necessary use silicon impression material to measure the areas A3.1 and A3.2.
    5. SUBTASK 72-50-33-380-077 Shotpeen the Repaired Areas of the Stage 4 Turbine Air Seal
    1. This SUBTASK requires source demonstration. Refer to step 4 (Repair Facilities) for further information.
    6. SUBTASK 72-50-33-350-154 Do the Post Repair
      1. Rebalance the air seal.
      1. Repair, VRS4438 TASK 72-50-33-300-052 (REPAIR-052).
    7. Figure: Blend repair of the stage 4 turbine air seal
    Sheet 1
    Legend
    Blend repair of the stage 4 turbine air seal
    Sheet 1
    Close
    Figure: Blend repair of the stage 4 turbine air seal
    Sheet 2
    Legend
    Blend repair of the stage 4 turbine air seal
    Sheet 2
    Close
    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:Carbide tipped reamer
Tool Name:Carbide tipped reamer
Manufacturer Code:LOCAL
Tool Number:Silicon impression material
Tool Name:Silicon impression material