TASK 72-45-00-300-004 HPT Stage 2 Air Seal - Blend Repair On The Knife Edges, Repair-004 (VRS3207)

DMC:V2500-A0-72-45-0012-01A-649A-C|Issue No:004.00|Issue Date:2019-08-01

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 72-45-00-300-004 HPT Stage 2 Air Seal - Blend Repair On The Knife Edges, Repair-004 (VRS3207)

Effectivity

FIG/ITEM

PART NO.

01-080

2A4157

01-080

2A4196

General

This repair is not necessary for surface damage up to 0.001 in. (0.025 mm) maximum in depth.

The maximum rotary equipment speed is 18,000 RPM.

Material of component.

PART IDENT

SYMBOL

MATERIAL

Stage 2 HPT air seal

-

Nickel alloy

Preliminary Requirements

Pre-Conditions

Action/ConditionData Module/Technical Publication
Make sure that all the cleaning and inspection procedures are done before this repair.

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Balancing equipmentLOCAL

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

CAUTION

USE THIS REPAIR FOR THE DAMAGED PARTS WHICH HAVE LESS THAN THEIR LIFE CYCLE LIMIT. THIS REPAIR WILL NOT EXTEND THE STAGE 2 HPT AIR SEAL LIFE CYCLE. IF OTHER UNUSUAL CONDITIONS ARE FOUND BY THE PENETRANT TEST OR VISUAL INSPECTION, REJECT THE PART

Procedure

    1. SUBTASK 72-45-00-350-053-001 Blend the Stage 2 HPT Air Seal Knife-Edge Seals (Rotary Method)

      1. Blend the knife-edge seals by SPM TASK 70-35-03-300-501.

      1. Refer to Figure and Figure.

      2. Use power blend method.

      3. All blended areas must be smooth and continuous.

      4. Blend smoothly into the initial knife-edge contour.

      5. The maximum blend area for one knife-edge blend is 0.100 sq in. (65 sq mm).

      6. The maximum cumulative blend area for all knife-edges is 0.200 sq in. (130 sq mm).

      7. The minimum blend length to depth ratio is 15 to 1.

      8. The minimum blend radius to depth ratio is 30 to 1.

      9. Break the edges 0.003 in. to 0.015 in. (0.08 mm to 0.38 mm).

      10. Chipped or missing coating at edges of blended areas is acceptable.

      11. Blend 0.002 in. to 0.003 in. (0.05 mm to 0.08 mm) beyond damage.

    2. SUBTASK 72-45-00-350-053-002 Blend the Stage 2 HPT Air Seal Knife-Edges Seals (Manual Method)

      1. Blend the knife-edge seals by SPM TASK 70-35-03-300-501.

      1. Refer to Figure and Figure.

      2. All blended areas must be smooth and continuous.

      3. Blend smoothly into the initial knife-edge contour.

      4. The maximum blend area for one knife-edge blend is 0.100 sq in. (65 sq mm).

      5. The maximum cumulative blend area for all knife-edges is 0.200 sq in. (130 sq mm).

      6. The minimum blend length to depth ratio is 15 to 1.

      7. The minimum blend radius to depth ratio is 30 to 1.

      8. Break the edges 0.003 in. to 0.015 in. (0.08 mm to 0.38 mm).

      9. Chipped or missing coating at edges of blended areas is acceptable.

      10. Blend 0.002 in. to 0.003 in. (0.05 mm to 0.08 mm) beyond damage.

    3. SUBTASK 72-45-00-110-001 Clean the Stage 2 HPT Air Seal

      1. Clean the air seal.

      1. Refer to SPM TASK 70-11-03-300-503.

    4. SUBTASK 72-45-00-230-055 Examine the Repair

    1. Do a fluorescent penetrant inspection of the repair area by the applicable part number task in TASK 72-45-00-200-000.

    5. SUBTASK 72-45-00-220-084 Examine the Air Seal for Balance After Blend Repair

      1. Do a balance check of the air seal after blend repair of the knife-edge seals.

      1. Refer to Figure and Figure.

      2. Install the HPT Stage 2 Air Seal into the fixture. Use appropriate fixture.

      3. Constraint contact permitted only on Diameter D and Surface F. Use appropriate fixture.

      4. Turn the HPT Stage 2 Air Seal at 900 RPM.

      5. Record amount of unbalance in oz-in.

      6. Static unbalance must not exceed 1.0 oz-in. (720.0 gmm). If static unbalance exceeds 1.0 oz-in. (720.0 gmm) then rebalance the HPT Stage 2 Air Seal by TASK 72-45-00-300-013 (REPAIR-013).

      7. Remove prior unbalance marking and make a mark for amount and location of unbalance by TASK 70-09-00-400-501, Procedures to Make Permanent Identification And Location Marks. Use shallow electrolytic etch method only.

    6. Figure: Repair Details and Dimensions

    Repair Details and Dimensions

    Figure: Marking and Electrical Contact Location

    Marking and Electrical Contact Location

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedure to update repair reference. (18VC485)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
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