TASK 72-50-31-300-015 LPT Stage 4 Disk - Rebalance The Disk, Repair-015 (VRS4171)

DMC:V2500-A0-72-50-3104-00A-709A-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 72-50-31-300-015 LPT Stage 4 Disk - Rebalance The Disk, Repair-015 (VRS4171)

Effectivity

FIG/ITEM

PART NO.

01-150

3A0794

01-150

3A1984

Material of component

IAE

DESCRIPTION

SYMBOL

MATERIAL

Stage 4 turbine disk

MTS1094A/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

Special tools are identified in the procedure by the tool primary number.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Grinding machineLOCALGrinding machine
Vertical balancing machineLOCALVertical balancing machine
IAE 1M14020 Balancing base plate0AM53IAE 1M140201
IAE 1M14021 Balancing fixture sleeve0AM53IAE 1M140211
IAE 1M14023 Balancing fixture disk0AM53IAE 1M140231
IAE 1M14129 Lifting fixture0AM53IAE 1M141291

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-31-350-071 General Instructions to Rebalance the Stage 4 Turbine Disk after Repair

      1. Remove material to get the balance within the limits.

      1. Machine grind the turbine disk.

        For small quantities of material, use files.

      2. Polish the machined areas.

      1. Use fine stones to make the worked surface as smooth as the adjacent surface.

    2. SUBTASK 72-50-31-350-081 Prepare the Stage 4 Turbine Disk for the Rebalance Procedure

    1. Refer to: Figure

      2. Install the balancing fixture sleeve on to the balancing base plate.

      3. Install the balancing base plate on to the vertical balancing machine.

      1. Align the TOP marks.

      4. Install the balancing fixture disk on to the balancing base plate.

      1. Align the TOP marks.

      5. Install the stage 4 turbine disk on to the balancing tool assembly and safety.

      1. Use the IAE IAE 1M14129 Lifting fixture 1 off.

        Move the stage 4 turbine disk carefully down to the installed balancing tool assembly.

        Align the TOP marks.

    3. SUBTASK 72-50-31-350-072 Rebalancing the Stage 4 Turbine Disk

    1. Refer to: Figure

      2. Do the first check for static unbalance of the stage 4 turbine disk at 900 RPM minimum.

      1. The direction of turn on the vertical balancing machine must be in clockwise direction.

        The unbalance value includes the unbalance of the tools.

      3. Remove the stage 4 turbine disk from the balancing tool assembly.

      1. Use the IAE IAE 1M14129 Lifting fixture 1 off.

      4. Install the stage 4 turbine disk again on to the balancing tool assembly and safety.

      1. The installation of the turbine disk must be in a 180 degree position opposite to the first rebalance position.

        Use the lifting fixture.

      5. Do the check for actual static unbalance of the turbine disk at 900 RPM minimum.

      1. The initial unbalance must not be more than maximum 5 ozin (3600 gmm) when attached on diameter B and plane A.

        The remaining unbalance must not be more than maximum 0.50 ozin (360 gmm).

        The direction of turn on the vertical balancing machine must be in clockwise direction.

    4. SUBTASK 72-50-31-350-142-001 Rebalance the Stage 4 Turbine Disk

    1. Refer to: Figure and Figure

      NOTE

      1. Keep the material removal to the minimum to get the balance within the limits.

      2. Do not remove material from a small number of lugs. Remove material over a larger number, with less removal for each lug, to permit more rebalance procedures.

      2. Correct the unbalance.

      1. Install the disk on grinding machine.

        Remove material to bring the unbalance in the limits, refer to Step, Step D.

        Remove material as shown in Figure and in Figure.

        Edges must be rounded 0.004 to 0.020 in. (0.10 to 0.50 mm).

    5. SUBTASK 72-50-31-350-142-002 Rebalance the Stage 4 Turbine Disk

    1. Refer to: Figure and Figure

      2. Optional procedure.

      1. If actual unbalance is between 0.50 and 5.00 ozin (360 and 3600 gmm), mark the actual unbalance value (ozin to two decimal places) in area A2.

        Refer to the SPM TASK 70-09-00-400-501 mechanical vibro-peening, 0.002 in. (0.05 mm) maximum depth and refer to Figure.

        Marking to be within plus 5 and minus 5 degrees of actual position.

        Optional mark on area A1.

        Refer to the SPM TASK 70-09-00-400-501, electrolytical etching, shallow.

        No material removal is required.

        Refer to Figure.

        If unbalance is already marked on the disk and static unbalance has changed, delete previous unbalance value and mark as described above.

    6. SUBTASK 72-50-31-220-114 Do the Post Repair Inspection of the Stage 4 Turbine Disk

      1. Examine the surface finish.

      1. The surface finish of all the ground areas must be as smooth as the adjacent areas.

      2. Examine dimensionally the grinded areas.

      1. Make sure that the dimensions are not more than the maximum, refer to Figure.

    7. Figure: Rebalance the stage 4 turbine disk

    Rebalance the stage 4 turbine disk

    Figure: Balancing diagram of the stage 4 turbine disk

    Balancing diagram of the stage 4 turbine disk

    Figure: Unbalance marking area

    Unbalance marking area

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial correction due to conversion

Manufacturer Code:0AM53
Enterprise Name:IAE INTERNATIONAL AERO ENGINES AG
BU Name:NULL
Building:SUITE 400
Street:628 HEBRON AVENUE
City:GLASTONBURY
State:CT
Zip Code:06033
Country:USA
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Link not Found
Manufacturer Code:0AM53
Tool Number:IAE 1M14020
Tool Name:IAE 1M14020 Balancing base plate
Manufacturer Code:0AM53
Tool Number:IAE 1M14021
Tool Name:IAE 1M14021 Balancing fixture sleeve
Manufacturer Code:0AM53
Tool Number:IAE 1M14023
Tool Name:IAE 1M14023 Balancing fixture disk
Manufacturer Code:0AM53
Tool Number:IAE 1M14129
Tool Name:IAE 1M14129 Lifting fixture
Manufacturer Code:LOCAL
Tool Number:Vertical balancing machine
Tool Name:Vertical balancing machine