TASK 72-50-31-200-001-C00 LPT Stage 7 Disk - Examine, Inspection-001

DMC:V2500-A0-72-50-3107-00C-300A-C|Issue No:004.00|Issue Date:2019-11-01

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 72-50-31-200-001-C00 LPT Stage 7 Disk - Examine, Inspection-001

Effectivity

FIG/ITEM

PART NO.

01-010

3A2424

01-010

3A2512

General

This TASK gives the procedure for the inspection of the stage 7 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 70-20-00-200-501.

All the parts must be cleaned before any part is examined. Refer to the TASK 72-50-31-100-000 (CLEANING-000).

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 crack 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.

Definition 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 70-20-00-200-501

Some data on these items are 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 72-50-31-220-228 General Instructions for the Inspection of the Stage 7 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 SUBTASK 72-50-31-220-231.

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

    2. SUBTASK 72-50-31-230-082 Examine the Stage 7 Turbine Disk for Cracks

    1. Clean the parts. Refer to TASK 72-50-31-100-000 (CLEANING-000).

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

        PART IDENT

        TASK/SUBTASK

        Stage 7 Turbine Disk

        1. Cracked

        1. Reject

          NOTE

          Special attention areas for crack test, refer to TASK 72-50-31-200-006 (INSPECTION/CHECK-006, CONFIG-001).

    3. SUBTASK 72-50-31-220-229 Examine the Stage 7 Turbine Disk for Corrosion

      1. Visually examine the disk for corrosion pitting.

        1. Corrosion pitting

        1. Repair-042, VRS4603 TASK 72-50-31-300-042

    4. SUBTASK 72-50-31-220-230 Examine the Stage 7 Turbine Disk for Damage

    1. Refer to Figure.

      2. Dimensionally examine the disk in area A2 for grooves. Use the dial gage, dial indicator with needle insert and horizontal rotating table.

        1. Grooved (due to seal ring contact)

          1. Maximum depth of the grooves up to 0.003 in. (0.076 mm)

          1. Accept

          2. If the depth of the grooves is between 0.003 in. and 0.006 in. (0.076 and 0.152 mm).

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

          3. More than in Step

          1. Reject

    5. SUBTASK 72-50-31-220-231 Examine the Stage 7 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 72-50-31-220-232 Examine the Stage 7 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Visually examine the disk surface for damage in area A4.

        1. Nicked and dented

          1. Maximum depth is 0.0004 in. (0.010 mm), not with raised material.

          1. Accept

          2. More than in Step

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

        2. Scratched

          1. Maximum depth in a circumferential direction is 0.0004 in. (0.010 mm) and in other direction is maximum depth 0.0002 in. (0.005 mm).

          1. Accept

          2. More than in Step

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

    7. SUBTASK 72-50-31-220-233 Examine the Stage 7 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Visually examine the disk surface for damage in area A5.

        1. Nicked

          1. Maximum depth is 0.001 in. (0.025 mm), not with raised material.

          1. Accept

          2. More than in Step

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

        2. Dented

          1. Maximum depth is 0.002 in. (0.05 mm), not with raised material.

          1. Accept

          2. More than in Step

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

        3. Scratched

          1. Maximum depth in a circumferential direction is 0.002 in. (0.05 mm) and in other direction is maximum depth 0.0004 in. (0.010 mm).

          1. Accept

          2. More than in Step

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

    8. SUBTASK 72-50-31-220-234 Examine the Stage 7 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Visually examine the disk surface for damage in area A6.

        1. Nicked and dented

          1. Maximum depth is 0.0004 in. (0.010 mm).

          1. Accept

          2. Between 0.0004 in. and 0.0022 in. (0.010 and 0.055 mm)

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

          3. Other than in Step or Step

          1. Reject

        2. Scratched

          1. Maximum depth in a circumferential direction is 0.0004 in. (0.010 mm) and in other direction is maximum depth 0.0002 in. (0.005 mm).

          1. Accept

          2. Between permitted limit in Step and 0.0022 in. (0.055 mm) maximum depth

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

          3. Other than in Step or Step

          1. Reject

    9. SUBTASK 72-50-31-220-235 Examine the Stage 7 Turbine Disk for Surface Damage

    1. Refer to Figure.

      2. Examine the disk surface for damage in area A7.

        1. Fretted

          1. Up to 0.002 in. (0.05 mm) in depth

          1. Accept

          2. More than in Step

          1. Reject

        2. Nicked, dented, and scratched

          1. Maximum depth in the round bottom dents in the lead-in radii is 0.005 in. (0.127 mm).

          1. Accept

          2. Other than in Step

          1. Repair-035, VRS4518 TASK 72-50-31-300-035

    10. SUBTASK 72-50-31-220-236 Examine the Stage 7 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 72-50-31-220-237 Examine the Stage 7 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 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 72-50-31-220-238 Examine the Stage 7 Turbine Disk for Excessive Deflection

    1. Refer to Figure.

      2. Do a check run-out of the inner flange to plane A and diameter B. Use dial gage and horizontal rotating table.

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

        1. Accept

        2. More than in Step

        1. Reject

      3. Do a check parallelism of the inner flange to plane A. Use dial gage and horizontal rotating table.

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

        1. Accept

        2. More than in Step

        1. Reject

    13. SUBTASK 72-50-31-220-239 Examine the Stage 7 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. Up to 17.6905 in. (449.34 mm) maximum diameter

        1. Accept

        2. More than in Step

        1. Repair-024, VRS4425 TASK 72-50-31-300-024

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

        1. Between 17.6890 in. and 17.6831 in. (449.30 and 449.15 mm)

        1. Accept

        2. Between 17.6909 in. and 17.6811 in. (449.35 and 449.10 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 3365 or 3665 or 3765. Refer to TASK 72-50-10-430-010.

        3. Other than in Step or Step

        1. Reject

    14. SUBTASK 72-50-31-220-347 Examine the Stage 7 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. Up to 19.1363 in. (486.06 mm) minimum diameter

        1. Accept

        2. Less than in Step

        1. Repair-024, VRS4425 TASK 72-50-31-300-024

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

        1. Between 19.1417 in. and 19.1339 in. (486.20 and 486.00 mm)

        1. Accept

        2. Between 19.1437 in. and 19.1339 in. (486.25 and 486.00 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 3364 or 3664 or 3764. Refer to TASK 72-50-30-440-005 or TASK 72-50-30-440-005-A00 or TASK 72-50-30-440-005-B00.

        3. Other than in Step or Step

        1. Reject

    15. Figure: Examine the Stage 7 Turbine Disk

    Examine the Stage 7 Turbine Disk

    Figure: Examine the Stage 7 Turbine Disk

    Examine the Stage 7 Turbine Disk

    Figure: Examine the Stage 7 Turbine Disk

    Examine the Stage 7 Turbine Disk

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

New limits for surface damage added. (93VM503G)

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