TASK 72-50-31-200-004 LPT Stage 4 Disk - Examine, Inspection-004

DMC:V2500-A0-72-50-3104-00A-300A-C|Issue No:005.00|Issue Date:2020-11-01

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 72-50-31-200-004 LPT Stage 4 Disk - Examine, Inspection-004

Effectivity

FIG/ITEM

PART NO.

01-150

3A0794

General

This TASK gives the procedure for the inspection of the stage 4 LP turbine disk. For the other LP turbine disk parts, refer to TASK 72-50-31-200-000 (INSPECTION-000).

Fig/item numbers in parentheses in the procedure agree with those used in the IPC.

The policy that is necessary for inspection is given in the SPM TASK 70-20-01-200-501.

All parts must be cleaned before any part is examined. Refer to TASK 72-50-00-100-000 (CLEANING).

All parts must be visually examined for damage, corrosion, and wear. Any defects that are not identified in the procedure must be referred to IAE.

The procedure for those parts which must have a crack test is given in Step. Do the test before the part is visually examined.

Do not discard any part until you are sure there are no repairs available. Refer to the instructions in Repair before a discarded part is used again or oversize parts are installed.

Parts which should be discarded can be held although no repair is available. The repair of a discarded part could be shown to be necessary at a later date.

All parts must be examined to make sure that all the repairs have been completed satisfactorily.

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

References

Refer to the SPM for data on these items.

Definitions of Damage, SPM TASK 70-02-02-350-501

Record and Control of the Lives of Parts, SPM TASK 70-05-00-220-501

Inspection of Parts, SPM TASK 70-20-01-200-501

Some data on these items is contained in this TASK. For more data on these items refer to the SPM.

Method of Testing for Crack Indications

Chemical Processes

Surface Protection

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Dial gageLOCALDial gage
Dial indicator with needle insertLOCALDial indicator with needle insert
Horizontal rotating tableLOCALHorizontal rotating table
Vickers hardness testerLOCALVickers hardness tester

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

  1. SUBTASK 72-50-31-220-085 General Instructions for the Inspection of the Stage 4 Turbine Disk

    NOTE

    1. Examine the disk. If there are signs of overheating or the LPT module was reported for overheating do the hardness check. Refer to Step.

    2. Dimensions are given at a temperature of 68 deg F (20 deg C).

    2. SUBTASK 72-50-31-230-054 Examine the Stage 4 Turbine Disk for Cracks

    1. Clean the parts. Refer to TASK 72-50-00-100-000 (CLEANING).

      2. Do the test for cracks on the parts that are given below. Use the applicable penetrant procedure.

        PART IDENT

        TASK/SUBTASK

        Stage 4 Turbine Disk

        1. Cracked

        1. Reject

          NOTE

          Special attention areas for crack test, refer to TASK 72-50-31-200-006 (INSPECTION-006).

    3. SUBTASK 72-50-31-220-086 Examine the Stage 4 Turbine Disk for Corrosion

      1. Examine the surface for corrosion pitting.

        1. Corrosion pitting

        1. Repair-039, VRS4543 TASK 72-50-31-300-039

    4. SUBTASK 72-50-31-220-087 Examine the Stage 4 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A2 for grooves. Use Dial gage, Dial indicator with needle insert, and Horizontal rotating table.

        1. Grooved (due to seal ring contact)

          1. Not more than 0.003 in. (0.08 mm) maximum depth

          1. Accept

          2. More than in Step and not more than 0.006 in. (0.15 mm) maximum depth

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

    5. SUBTASK 72-50-31-220-088 Examine the Stage 4 Turbine Disk for Hardness

    1. Refer to Figure.

      2. Do the hardness check at four positions equally spaced in area A3. Use HV10 test method.

        Do a comparison check at four positions equally spaced on the front flange in area A8.

        1. If the average of area A3 is lower than the average of area A8 by more than 30 HV.

        1. Reject

        2. If the average of area A3 is lower than 450 HV or equivalent.

        1. Reject

    6. SUBTASK 72-50-31-220-089 Examine the Stage 4 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A4.

        1. Nicked, dented

          1. Not more than 0.0004 in. (0.010 mm) maximum depth, no raised material

          1. Accept

          2. More than in Step

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

        2. Scratched

          1. Not more than 0.0004 in. (0.010 mm) maximum depth in circumferential direction and 0.0002 in. (0.005 mm) maximum depth in other direction

          1. Accept

          2. More than in Step

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

    7. SUBTASK 72-50-31-220-090 Examine the Stage 4 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A5.

        1. Nicked

          1. Not more than 0.0010 in. (0.025 mm) maximum depth, no raised material

          1. Accept

          2. More than in Step

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

        2. Dented

          1. Not more than 0.002 in. (0.05 mm) maximum depth, no raised material

          1. Accept

          2. More than in Step

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

        3. Scratched

          1. Not more than 0.002 in. (0.05 mm) maximum depth in circumferential direction and 0.0004 in. (0.010 mm) maximum depth in other direction

          1. Accept

          2. More than in Step

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

    8. SUBTASK 72-50-31-220-190 Examine the Stage 4 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A6.

        1. Nicked, dented

          1. Not more than 0.0004 in. (0.010 mm) maximum depth, no raised material

          1. Accept

          2. More than in Step and not more than 0.0022 in. (0.055 mm) maximum depth

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

        2. Scratched

          1. Not more than 0.0004 in. (0.010 mm) maximum depth in circumferential direction and 0.0002 in. (0.005 mm) maximum depth in other direction

          1. Accept

          2. More than in Step and not more than 0.0022 in. (0.055 mm) maximum depth

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

    9. SUBTASK 72-50-31-220-191 Examine the Stage 4 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A7.

        1. Fretted

          1. Not more than 0.002 in. (0.05 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

        2. Nicked, dented, scratched

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth in the lead in radii

          1. Accept

          2. Otehr than in Step

          1. Repair-013, VRS4169 TASK 72-50-31-300-013

    10. SUBTASK 72-50-31-220-091 Examine the Stage 4 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A1.

        1. Nicked, dented

          1. Not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

        2. Fretted, worn

          1. Not more than 0.002 in. (0.05 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

    11. SUBTASK 72-50-31-220-092 Examine the Stage 4 Turbine Disk Outer Diameter D1

    1. Refer to Figure.

      2. Measure the diameter D1 for growth at 120, 240, and 360 degrees. Get an average dimension.

        1. Maximum of 0.016 in. (0.40 mm) over the diameter identified on the disk

        1. Accept

        2. More than in Step

        1. Reject

      3. Measure the diameter D1 for shrinkage at 120, 240, and 360 degrees. Get an average dimension.

        1. Maximum 0.016 in. (0.40 mm) below the diameter identified on the disk

        1. Accept

        2. More than in Step

        1. Reject

    12. SUBTASK 72-50-31-220-094 Examine the Stage 4 Turbine Disk for Excessive Deflection

    1. Refer to Figure.

      2. Do a check run-out of inner flange at plane A and diameter B. Use Dial gage and Horizontal rotating table.

        1. Maximum of 0.004 in. (0.10 mm) full indicator movement

        1. Accept

        2. More than in Step

        1. Reject

      3. Do the check for parallelism of inner flange at plane A. Use Dial gage and Horizontal rotating table.

        1. Maximum of 0.004 in. (0.10 mm) full indicator movement

        1. Accept

        2. More than in Step

        1. Reject

    13. SUBTASK 72-50-31-220-095 Examine the Stage 4 Turbine Disk Snap Diameter D2

    1. Refer to Figure.

      2. Measure the diameter D2 for wear at 120, 240, and 360 degrees. Get an average dimension.

        1. Not less than 18.920 in. (480.56 mm) minimum diameter

        1. Accept

        2. Less than in Step

        1. Repair-016, VRS4172 TASK 72-50-31-300-016

      3. Measure the diameter D2 for shrinkage and growth at 120, 240, and 360 degrees. Get an average dimension.

        1. Between 18.925 in. and 18.915 in. (480.70 mm and 480.45 mm)

        1. Accept

        2. Between 18.927 in. and 18.915 in. (480.75 mm and 480.45 mm)

        1. Accept the part for selected fit only.

          NOTE

          This part can be used only if the mating part has a diameter that will result in a fit of reference 3353 or 3653 or 3753. Refer to TASK 72-50-10-430-006.

        3. Other than in Step or Step

        1. Reject

    14. SUBTASK 72-50-31-220-358 Examine the Stage 4 Turbine Disk Snap Diameter D3

    1. Refer to Figure.

      2. Measure the diameter D3 for wear at 120, 240, and 360 degrees. Get an average dimension.

        1. Not more than 18.549 in. (471.14 mm) maximum diameter

        1. Accept

        2. More than in Step

        1. Repair-014, VRS4170 TASK 72-50-31-300-014

      3. Measure the diameter D3 for shrinkage and growth at 120, 240, and 360 degrees. Get an average dimension.

        1. Between 18.547 in. and 18.541 in. (471.10 mm and 470.95 mm)

        1. Accept

        2. Between 18.549 in. and 18.537 in. (471.15 mm and 470.85 mm)

        1. Accept the part for selected fit only

          NOTE

          This part can be used only if the mating part has a diameter that will result in a fit of reference 3347 or 3647 or 3747. Refer to TASK 72-50-10-430-004.

        3. Other than in Step or Step

        1. Reject

    15. SUBTASK 72-50-31-220-359 Examine the Stage 4 Turbine Disk Snap Diameter D4

    1. Refer to Figure.

      2. Measure the diameter D4 for wear at 120, 240, and 360 degrees. Get an average dimension.

        1. Not less than 20.034 in. (508.86 mm) minimum diameter

        1. Accept

        2. Less than in Step

        1. Repair-014, VRS4170 TASK 72-50-31-300-014

      3. Measure the diameter D4 for shrinkage and growth at 120, 240, and 360 degrees. Get an average dimension.

        1. Between 20.039 in. and 20.030 in. (509.00 mm and 508.75 mm)

        1. Accept

        2. Between 20.041 in. and 20.030 in. (509.05 mm and 508.75 mm)

        1. Accept the part for selected fit only.

          NOTE

          This part can be used only if the mating part has a diameter that will result in a fit of reference 3343 or 3643 or 3743. Refer to TASK 72-50-30-440-002.

        3. Other than in Step or Step

        1. Reject

    16. Figure: Examine the Stage 4 Turbine Disk

    Examine the Stage 4 Turbine Disk

    Figure: Examine the Stage 4 Turbine Disk

    Examine the Stage 4 Turbine Disk

    Figure: Examine the Stage 4 Turbine Disk

    Examine the Stage 4 Turbine Disk

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised. (87VM525J)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Link not Found
Link not Found
Manufacturer Code:LOCAL
Tool Number:Horizontal rotating table
Tool Name:Horizontal rotating table
Manufacturer Code:LOCAL
Tool Number:Vickers hardness tester
Tool Name:Vickers hardness tester