TASK 72-50-33-200-004-A00 LPT Stage 4 Rotating Airseal - Examine, Inspection-004

DMC:V2500-A0-72-50-3304-00A-300A-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 72-50-33-200-004-A00 LPT Stage 4 Rotating Airseal - Examine, Inspection-004

Effectivity

FIG/ITEM

PART NO.

01-150

3A0792

01-150

3A1983

General

This TASK gives the procedure for the inspection of the stage 4 turbine air seal. For the other LP turbine rotating seal parts, refer to TASK 72-50-33-200-000 (INSPECTION-000).

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

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 72-50-33-100-000 (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/SUBTASK 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 70-20-00-200-501

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
Horizontal rotating tableLOCALHorizontal rotating table
Illuminated magnifier (portable)LOCALIlluminated magnifier (portable)

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-33-220-075 General Instructions for the Inspection of the Stage 4 Turbine Air Seal

    1. Use illuminated magnifier to examine the air seal.

    2. SUBTASK 72-50-33-230-057 Examine the Stage 4 Turbine Air Seal for Cracks

    1. Refer to: Figure

    2. Clean the part. Refer to TASK 72-50-33-100-000. (CLEANING-000).

      3. Do the test for cracks on the part that is given below. Use the applicable penetrant procedure.

        PART IDENT TASK/SUBTASK

        Stage 4 Turbine Air Seal

        SPM TASK 70-23-04-230-501

        1. Cracked on all areas without location A1

        1. Reject

        2. Cracked on location A1

          1. Up to a maximum 0.040 in. (1.0 mm) in depth

          1. Repair, VRS4234 TASK 72-50-33-300-023 (REPAIR-023)

          2. More than in (a)

          1. Repair, VRS4235 TASK 72-50-33-300-024 (REPAIR-024)

    3. SUBTASK 72-50-33-220-076 Examine the Stage 4 Turbine Air Seal for Surface Damage

    1. Refer to: Figure

      2. Examine the seal surface for damage on all locations except location A1. Use horizontal rotating table.

      1. Dented.

        2. 0.002 in. (0.05 mm) maximum depth. Except at locations A3 and A4

        1. Accept

        3. More than in (a)

        1. Repair, VRS4233 TASK 72-50-33-300-022 (REPAIR-022)

        4. Nicked.

          1. 0.002 in. (0.05 mm) maximum depth. Except at locations A3 and A4

          1. Accept

          2. More than in (a)

          1. Repair, VRS4233 TASK 72-50-33-300-022 (REPAIR-022)

      3. Examine the seal surface for foreign material, deposits, corrosion and scale on all locations except at locations A1 and A5.

        1. Pits or material depletion after cleaning/removal of foreign material deposits, corrosion or scale up to a maximum depth of 0.002 in. (0.05 mm) except at locations A3 and A4

        1. Accept

        2. More than in (1)

        1. Repair, VRS4233 TASK 72-50-33-300-022 (REPAIR-022)

      4. Examine the seal surface for foreign material, deposits, corrosion and scale at location A5.

        1. Pits or material depletion after cleaning/removal of foreign material deposits, corrosion or scale up to a maximum depth of 0.004 in. (0.10 mm)

        1. Accept

        2. More than in (1)

        1. Repair, VRS4233 TASK 72-50-33-300-022 (REPAIR-022)

    4. SUBTASK 72-50-33-220-077 Examine the Stage 4 Turbine Air Seal for Surface Damage at Locatin A1

    1. Refer to: Figure

      2. Examine the seal surface for damage at location A1.

        1. Nicked.

          1. Up to maximum 0.004 in. (0.10 mm) in depth

          1. Accept

          2. More than in (a)

          1. Repair, VRS4234 TASK 72-50-33-300-023 (REPAIR-023)

        2. Dented.

          1. Up to maximum 0.004 in. (0.10 mm) in depth

          1. Accept

          2. More than in (a)

          1. Repair, VRS4234 TASK 72-50-33-300-023 (REPAIR-023)

        3. Bent.

          1. Up to maximum 0.010 in. (0.25 mm) in deflection and 0.040 in. (1.00 mm) in depth, if contour is rounded

          1. Accept

          2. More than in (a)

          1. Repair, VRS4235 TASK 72-50-33-300-024 (REPAIR-024)

        4. Chipped coating.

          1. No limit in the number of areas, if total not more than 25 per cent of circumference

          1. Accept

          2. More than in (a)

          1. Repair, VRS4238 TASK 72-50-33-300-027 (REPAIR-027)

    5. SUBTASK 72-50-33-220-078 Examine the Stage 4 Turbine Air Seal Damage

    1. Refer to: Figure

      2. Examine the stage 4 turbine seal surface for damage at location A4, (at the tie bolt holes).

        1. Fretted.

          1. Up to maximum 0.002 in. (0.05 mm) in depth on the diameter

          1. Accept

          2. More than in (a)

          1. Reject

        2. Nicked or dented

        1. Repair, VRS4233 TASK 72-50-33-300-022 (REPAIR-022)

    6. SUBTASK 72-50-33-220-079 Examine the Stage 4 Turbine Air Seal for Fretting

    1. Refer to: Figure

      2. Examine the stage 4 turbine air seal for fretting at location A2.

        1. Fretted.

          1. Up to maximum 0.004 in. (0.10 mm) in depth

          1. Accept

          2. More than in (a)

          1. Repair, VRS4239 TASK 72-50-33-300-028 (REPAIR-028)

    7. SUBTASK 72-50-33-220-080 Examine the Stage 4 Turbine Air Seal for Fretting

    1. Refer to: Figure

      2. Examine the stage 4 turbine air seal for fretting at location A3.

        1. Fretted.

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

          1. Accept

          2. More than in (a)

          1. Reject

    8. SUBTASK 72-50-33-220-081 Examine the Stage 4 Turbine Air Seal for Wear

    1. Refer to: Figure

      2. Measure the diameter D1 for wear at the two seal fins at 120, 240 and 360 degrees. Get an average dimension.

        1. 21.6083 in. (548.85 mm) minimum for each diameter

        1. Accept

        2. Less than in (1)

        1. Repair, VRS4235 TASK 72-50-33-300-024 (REPAIR-024) or Repair, VRS4238 TASK 72-50-33-300-027 (REPAIR-027)

    9. SUBTASK 72-50-33-220-082 Examine the Stage 4 Turbine Air Seal 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 20.0291 in. (508.74 mm) maximum diameter

        1. Accept

        2. More than in (1)

        1. Repair, VRS4236 TASK 72-50-33-300-025 (REPAIR-025). Shrunken or grown diameter must not be plasma spray repaired

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

        1. Between 20.0217 and 20.0276 in. (508.55 and 508.70 mm)

        1. Accept

        2. Between 20.0177 and 20.0295 in. (508.45 and 508.75 mm)

        1. Accept the part for select 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 (1) or (2)

        1. Reject

    10. Figure: Examine the stage 4 turbine air seal

    Examine the stage 4 turbine air seal

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial correction due to conversion

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Horizontal rotating table
Tool Name:Horizontal rotating table
Manufacturer Code:LOCAL
Tool Number:Illuminated magnifier (portable)
Tool Name:Illuminated magnifier (portable)