TASK 72-50-31-300-006 LPT Stage 6 Disk - Rebalance The Disk, Repair-006 (VRS4159)

DMC:V2500-A0-72-50-3106-00A-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 72-50-31-300-006 LPT Stage 6 Disk - Rebalance The Disk, Repair-006 (VRS4159)

Effectivity

FIG/ITEM

PART NO.

01-050

3A0066

01-050

3A1986

01-050

3A2996

Material of component

PART IDENT

SYMBOL

MATERIAL

Stage 6 turbine disk

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 1M14027 Balancing fixture disk0AM53IAE 1M140271
IAE 1M14021 Balancing fixture sleeve0AM53IAE 1M140211
IAE 1M14129 Lifting fixture0AM53IAE 1M141291

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-31-350-065 General Instructions to Rebalance the Stage 6 Turbine Disk after Repair

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

      1. Machine grind the stage 6 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 72-50-31-350-079 Prepare the Stage 6 Turbine Disk for the Rebalance Procedure

    1. Refer to: Figure

      2. Install the balancing fixture disk on to the vertical balancing machine.

      1. Align the TOP marks.

      3. Install the balancing fixture sleeve on to the balancing fixture.

      1. Align the installation groove of the balancing fixture with the dowel pin of the balancing fixture sleeve.

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

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

        Align the TOP marks.

    3. SUBTASK 72-50-31-350-066 Rebalance the Stage 6 Turbine Disk

    1. Refer to: Figure

      2. Do the first check for static unbalance of the stage 6 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 6 turbine disk from the balancing tool assembly.

      4. Install the stage 6 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 the actual static unbalance of the stage 6 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 maching must be in clockwise direction.

    4. SUBTASK 72-50-31-350-140-001 Rebalance the Stage 6 Turbine Disk

      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.

    1. Refer to: Figure and Figure

      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 72-50-31-350-140-002 Rebalance the Stage 6 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 72-50-31-220-110 Do the Post Repair Inspection of the Stage 6 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: Repair Details and Dimensions

    Repair Details and Dimensions

    Figure: 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
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 1M14021
Tool Name:IAE 1M14021 Balancing fixture sleeve
Manufacturer Code:0AM53
Tool Number:IAE 1M14027
Tool Name:IAE 1M14027 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