TASK 72-50-33-200-004-B00 LPT Stage 4 Rotating Airseal - Examine, Inspection-004

DMC:V2500-A0-72-50-3304-00B-300A-C|Issue No:001.00|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-B00 LPT Stage 4 Rotating Airseal - Examine, Inspection-004

Effectivity

FIG/ITEM PART NO.

01-150

3A2422

General

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

Fig/item numbers in parantheses 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 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 and Step. Do the crack test before the part is visually examined.

A ** following repair referenced in this inspection indicates that the repair is not yet published in the current revision of the manual and the part must be rejected. Contact IAE for additional information concerning FAA approved repair date.

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

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-33-230-136 Examine the Stage 4 Turbine Air Seal for Cracks

    1. Refer to Figure.

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

      3. Do the test for cracks in all areas without area A1. Use the applicable penetrant procedure.

        PART IDENT TASK/SUBTASK

        Stage 4 Turbine Air Seal

        1. Cracked

        1. Reject

    2. SUBTASK 72-50-33-230-137 Examine the Stage 4 Turbine Air Seal for Cracks

    1. Refer to Figure.

      NOTE

      If chipped coating is more than acceptable limits, the test for cracks has to be done after coating has been stripped per VRS4394 TASK 72-50-33-300-050 (REPAIR-050).

    2. Do the test for cracks in area A1. Use the applicable penetrant procedure.

      PART IDENT TASK/SUBTASK

      Stage 4 Turbine Air Seal

      3. Cracked

      1. Repair VRS4390, TASK 72-50-33-300-049 (REPAIR-049) or Repair VRS4391, TASK 72-50-33-300-063 (REPAIR-063)**

    3. SUBTASK 72-50-33-220-057 Examine the Stage 4 Turbine Air Seal for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in all areas except in areas A1, A3 and A4.

        1. Dented.

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

          1. Accept

          2. More than in (a)

          1. Repair, VRS4461 TASK 72-50-33-300-053 (REPAIR-053)

        2. Nicked.

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

          1. Accept

          2. More than in (a)

          1. Repair, VRS4461 TASK 72-50-33-300-053 (REPAIR-053)

      3. Examine the surface for foreign material, deposits, corrosion, scale in all areas except in areas A3 and A4.

        1. Pits or material depletion after cleaning / removal of foreign material deposits, corrosion or scale not more than 0.004 in. (0.10 mm) maximum depth

        1. Accept

        2. More than in (1)

        1. Repair, VRS4461 TASK 72-50-33-300-053 (REPAIR-053)

    4. SUBTASK 72-50-33-220-058 Examine the Stage 4 Turbine Air Seal for Surface Damage

    1. Refer to Figure.

      2. Examine the seal surface in area A1.

        1. Nicked.

          1. Not more than 0.0040 in. (0.10 mm) maximum depth

          1. Accept

          2. More than in (a)

          1. Repair, VRS4390 TASK 72-50-33-300-049 (REPAIR-049)

        2. Dented.

          1. Not more than 0.0040 in. (0.10 mm) maximum depth

          1. Accept

          2. More than in (a)

          1. Repair, VRS4390 TASK 72-50-33-300-049 (REPAIR-049)

        3. Bent.

          1. Not more than 0.010 in. (0.25 mm) in maximum deflection and 0.040 in. (1.00 mm) in depth, if the contour is rounded

          1. Accept

          2. More than in (a)

          1. Repair, VRS4390 TASK 72-50-33-300-049 (REPAIR-049) or Repair, VRS4391 TASK 72-50-33-300-063 (REPAIR-063)**

        4. Chipped coating.

          1. 0.060in. (1.52 mm) maximum length of chipped coating in circumferential direction, provided chipped areas are not connected by a minimum distance of 1.000in. (25.40 mm). No limit in the number of areas.

          1. Accept

          2. More than in (a)

          1. Repair, VRS4394 TASK 72-50-33-300-050 (REPAIR-050)

    5. SUBTASK 72-50-33-220-059 Examine the Stage 4 Turbine Air Seal for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A4.

        1. Fretted.

          1. Not more than 0.001 in. (0.025 mm) maximum depth on the diameter

          1. Accept

          2. More than in (a)

          1. Reject

        2. Nicked

        1. Repair, VRS4461 TASK 72-50-33-300-053 (REPAIR-053)

        3. Dented

        1. Repair, VRS4461 TASK 72-50-33-300-053 (REPAIR-053)

    6. SUBTASK 72-50-33-220-060 Examine the Stage 4 Turbine Air Seal for Fretting

    1. Refer to Figure.

      2. Examine the surface in area A2.

        1. Fretted.

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

          1. Accept

          2. More than in (a)

          1. Repair, VRS4392 TASK 72-50-33-300-054 (REPAIR-054)

    7. SUBTASK 72-50-33-220-061 Examine the Stage 4 Turbine Air Seal for Fretting

    1. Refer to Figure.

      2. Examine the surface in area A3.

        1. Fretted.

          1. Not more than 0.001 in. (0.025 mm) maximum depth

          1. Accept

          2. More than in (a)

          1. Reject

    8. SUBTASK 72-50-33-220-062 Examine the Stage 4 Turbine Air Seal at Diameter D1 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. Not lass than 21.6158 in. (549.04 mm) for each diameter

        1. Accept

        2. Less than in (1)

        1. Repair, VRS4394 TASK 72-50-33-300-050 (REPAIR-050) or VRS4391 TASK 72-50-33-300-063 (REPAIR-063)**

    9. SUBTASK 72-50-33-220-063 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. Not more than 20.0295 in. (508.75 mm)

        1. Accept

        2. More than in (1)

        1. Repair, VRS4393 TASK 72-50-33-300-055 (REPAIR-055)** 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. Not less than 20.0217 in. (508.55 mm) and not more than 20.0276 in. (508.70 mm)

        1. Accept

        2. Not less than 20.0177 in. (508.45 mm) and not more than 20.0295 in. (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