TASK 72-50-33-300-043 LPT Stage 5 Rotating Airseal - Blend Repair On The Knife Edge Seals, Repair-043 (VRS4384)

DMC:V2500-A0-72-50-3305-02A-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 72-50-33-300-043 LPT Stage 5 Rotating Airseal - Blend Repair On The Knife Edge Seals, Repair-043 (VRS4384)

Effectivity

FIG/ITEM

PART NO.

01-100

3A2423

Material of component

PART IDENT

SYMBOL

MATERIAL

Stage 5 turbine airseal

Inconel 100

Powder metal

General

Price and availability - none

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

Refurbishment of the abradable coating on the knife edge seals is not a requirement after blending.

NOTE

For more equipment and materials necessary to do this repair, refer to the SPM TASK 70-23-05-230-501 and SPM TASK 70-35-21-350-501.
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 72-50-33-350-121 Blend Repair the Knife Edge Seals of the Stage Turbine 5 Airseal

      NOTE

      1. Refer to the SPM TASK 70-35-21-350-501 for blending surface damage.

      2. Do not try to make straight bent knife edge seals.

      3. The total area of blends on each knife edge seal must not be more than 0.093 sqin. (60 sqmm) provided the nearest blend on the adjacent knife edge is more than 2.00 in. (50.8 mm) away.

      4. The total area of blends on each knife edge seal must not be more than 0.046 sqin. (30 sqmm) provided the nearest blend on the adjacent knife edge is less than 2.00 in. (50.8 mm) away.

    1. Refer to Figure.

      2. Blend repair in area A1.

      1. Keep minimum remaining knife edge height of 0.0177 in. (0.45 mm).

    2. SUBTASK 72-50-33-230-138 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 permitted.

    3. SUBTASK 72-50-33-220-064 Do the Post Repair Inspection

      1. Examine the surface of the blended areas visually.

      1. The blended surface must be as smooth as the initial surface. Edges and corners are not permitted.

    4. SUBTASK 72-50-33-350-122 Do the Post Repair

      1. Rebalance the turbine airseal.

      1. Refer to VRS4437 TASK 72-50-33-300-051 (REPAIR-051).

    5. Figure: Repair Details and Dimensions

    Repair Details and Dimensions

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial correction due to conversion