TASK 72-50-23-200-003-D00 LPT Stage 4 Outer Shroud Seal Segment - Examine The Stage 4 Shroud Seal Segment

DMC:V2500-A5-72-50-2304-00A-300A-C|Issue No:005.00|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 72-50-23-200-003-D00 LPT Stage 4 Outer Shroud Seal Segment - Examine The Stage 4 Shroud Seal Segment

Effectivity

FIG/ITEM

PART NO.

01-250

3A2950

General

This TASK gives the procedure for the inspection of the stage 4 shroud seal segment.

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

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

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 CLEANING-000 TASK 72-50-23-100-000.

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.

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 72-50-23-230-019Examine the Stage 4 Shroud Seal Segment for Cracks

    1. Refer to Figure.

    2. Clean the parts. Refer to CLEANING-000 TASK 72-50-23-100-000.

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

        PART IDENT

        TASK/SUBTASK

        Stage 4 shroud seal segment

        1. Cracked in areas A3 not more than 0.240 in. (6.00 mm)

        1. Accept

        2. Cracked in Area A3 more than in Step and not more than 0.600 in. (15.24 mm)

        1. Refer to Repair-078, VRS4637 TASK 72-50-23-300-078.

        3. More than in Step

        1. Reject

        4. Cracked in other area.

        1. Reject

    2. SUBTASK 72-50-23-220-001 Examine the Stage 4 Shroud Seal Segment for Surface Damage

      1. Nicked, dented

        1. Not more than 0.005 in. (0.13 mm) maximum depth, no raised material

        1. Accept

        2. Other than in Step

        1. Refer to Repair-035, VRS4277 TASK 72-50-23-300-035.

    3. SUBTASK 72-50-23-220-002 Examine the Honeycombs of the Stage 4 Shroud Seal Segment for Damage

      1. Unbonded

        1. One unbonded area, maximum 20 adjacent cells

        1. Accept

        2. More than in Step

        1. Refer to Repair-068, VRS4570, TASK 72-50-23-300-068 .

      2. Damaged or bent cells

        1. Not more than three rows damaged, maximum length 0.800 in. (20.30 mm)

        1. Accept

        2. More than in Step

        1. Refer to Repair-068, VRS4570, TASK 72-50-23-300-068 .

      3. Rub damaged

        1. Smooth wear pattern, maximum 0.394 in. (10.00 mm) in width and maximum 0.060 in. (1.50 mm) in depth

        1. Accept

        2. More than in Step

        1. Refer to Repair-068, VRS4570, TASK 72-50-23-300-068 .

    4. SUBTASK 72-50-23-220-003 Examine the Stage 4 Shroud Seal Segment for Wear

    1. Refer to Figure.

      2. Examine the surface in Area A1

        1. Fretted

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

          1. Accept

          2. More than in Step

          1. Refer to Repair-017, VRS4094 TASK 72-50-23-300-017.

      3. Examine the surface in Area A2

        1. Fretted

          1. Not more than 0.003 in. (0.076 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

      4. Examine the surface in Area A4

        1. Fretted

          1. Not more than 0.008 in. (0.20 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Refer to Repair, VRS4492 (TASK 72-50-23-300-XXX)**

      5. Examine the surface at Dimension D1

        1. Worn, measure Dimension D1

          1. Not more than 0.2842 in. (7.22 mm)

          1. Accept

          2. More than in Step

          1. Refer to Repair, VRS4492 (TASK 72-50-23-300-XXX)**

      6. Examine the surface at Dimension D2

        1. Worn, measure Dimension D2

          1. Not less than 0.1515 in. (3.85 mm)

          1. Accept

          2. Less than in Step

          1. Reject

      7. Examine the surface at Dimension D3

        1. Worn, measure Dimension D3

          1. Not less than 0.0650 in. (1.65 mm)

          1. Accept

          2. Less than in Step and not less than 0.0472 in. (1.20 mm).

          1. Refer to Repair-058, VRS4555 TASK 72-50-23-300-058.

          3. Less than in Step

          1. Reject

    5. Figure: Examine The Stage 4 Shroud Seal Segment

    Examine The Stage 4 Shroud Seal Segment

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Correct subtask number due to duplication (CAS-62915-K9P4S0)