TASK 72-50-31-200-002-C00 LPT Stage 6 Disk - Examine

DMC:V2500-A0-72-50-3106-00C-300A-C|Issue No:001.00|Issue Date:2020-05-01

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 72-50-31-200-002-C00 LPT Stage 6 Disk - Examine

Effectivity

FIG/ITEM

PART NO.

01-050

3A2996

General

This TASK gives the procedure for the inspection of the stage 6 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 SUBTASK 72-50-31-230-001. 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 70-20-01-200-501

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 72-50-31-220-016 General Instructions for the Inspection of the Stage 6 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 72-50-31-220-019.

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

    2. SUBTASK 72-50-31-230-002 Examine the Stage 6 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 6 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 72-50-31-220-017 Examine the Stage 6 Turbine Disk for Corrosion

    1. Refer to Figure and Figure.

      2. Examine the surface for corrosion pitting in area A9, not in area A7.

        1. Not more than 0.0010 in. (0.025 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

      3. Examine the surface for corrosion pitting in area A10.

        1. Corrosion pitting

        1. Repair-041, VRS4545 TASK 72-50-31-300-041

    4. SUBTASK 72-50-31-220-018 Examine the Stage 6 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-004, VRS4157 TASK 72-50-31-300-004

    5. SUBTASK 72-50-31-220-019 Examine the Stage 6 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 72-50-31-220-020 Examine the Stage 6 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-004, VRS4157 TASK 72-50-31-300-004

        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-004, VRS4157 TASK 72-50-31-300-004

    7. SUBTASK 72-50-31-220-021 Examine the Stage 6 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-004, VRS4157 TASK 72-50-31-300-004

        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-004, VRS4157 TASK 72-50-31-300-004

        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-004, VRS4157 TASK 72-50-31-300-004

    8. SUBTASK 72-50-31-220-022 Examine the Stage 6 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

          1. Accept

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

          1. Repair-004, VRS4157 TASK 72-50-31-300-004

        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-004, VRS4157 TASK 72-50-31-300-004

    9. SUBTASK 72-50-31-220-023 Examine the Stage 6 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. Other than in Step

          1. Repair-004, VRS4157 TASK 72-50-31-300-004

    10. SUBTASK 72-50-31-220-024 Examine the Stage 6 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. (0.051 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

    11. SUBTASK 72-50-31-220-025 Examine the Stage 6 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 72-50-31-220-026 Examine the Stage 6 Turbine Disk for Excessive Deflection

    1. Refer to Figure.

      2. Do a check run-out of the outer 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 outer 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

      4. Do a check run-out of the inner web 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

    13. SUBTASK 72-50-31-220-027 Examine the Stage 6 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 17.699 in. (449.56 mm) minimum diameter

        1. Accept

        2. Less than in Step

        1. Repair-007, VRS4160 TASK 72-50-31-300-007

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

        1. Between 17.705 in. and 17.697 in. (449.70 mm and 449.50 mm)

        1. Accept

        2. Between 17.707 in. and 17.697 in. (449.75 mm and 449.50 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 72-50-31-220-028 Examine the Stage 6 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 less than 8.978 in. (228.05 mm) minimum diameter

        1. Accept

        2. Less than in Step

        1. Repair-008, VRS4162 TASK 72-50-31-300-008

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

        1. Between 8.981 in. and 8.978 in. (228.10 mm and 228.05 mm)

        1. Accept

        2. Between 8.981 in. and 8.976 in. (228.10 mm and 228.00 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 3392 or 3402 or 3782 or 3802. Refer to TASK 72-50-00-430-001.

        3. Other than in Step or Step

        1. Reject

    15. SUBTASK 72-50-31-220-029 Examine the Stage 6 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 more than 19.297 in. (490.14 mm) maximum diameter

        1. Accept

        2. More than in Step

        1. Repair-005, VRS4158 TASK 72-50-31-300-005

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

        1. Between 19.297 in. and 19.289 in. (490.15 mm and 489.95 mm)

        1. Accept

        2. Between 19.297 in. and 19.287 in. (490.15 mm and 489.90 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 3359 or 3659 or 3759. Refer to TASK 72-50-10-430-008.

        3. Other than in Step or Step

        1. Reject

    16. SUBTASK 72-50-31-220-030 Examine the Stage 6 Turbine Disk Snap Diameter D5

    1. Refer to Figure.

      2. Measure the diameter D5 for wear at 120, 240, and 360 degrees. Get an average dimension.

        1. Not less than 20.487 in. (520.36 mm) minimum diameter

        1. Accept

        2. Less than in Step

        1. Repair-005, VRS4158 TASK 72-50-31-300-005

      3. Measure the diameter D5 for shrinkage and growth at 120, 240, and 360 degrees. Get an average dimension.

        1. Between 20.492 in. and 20.484 in. (520.50 mm and 520.30 mm)

        1. Accept

        2. Between 20.494 in. and 20.484 in. (520.55 mm and 520.30 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 3358 or 3658 or 3758. Refer to TASK 72-50-30-440-004.

        3. Other than in Step or Step

        1. Reject

    17. Figure: Examine the Stage 6 Turbine Disk

    Examine the Stage 6 Turbine Disk

    Figure: Examine the Stage 6 Turbine Disk

    Examine the Stage 6 Turbine Disk

    Figure: Repair details and dimensions

    Repair details and dimensions

    Figure: Examine the Stage 6 Turbine Disk

    Examine the Stage 6 Turbine Disk

Requirements After Job Completion

Follow-On Conditions

NONE
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