TASK 72-50-21-300-030 LPT Case - Replace The Borescope Boss And/or Damaged Rivets, Repair-030 (VRS4341)

DMC:V2500-A0-72-50-2101-04A-920A-C|Issue No:003.00|Issue Date:2015-08-01

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 72-50-21-300-030 LPT Case - Replace The Borescope Boss And/or Damaged Rivets, Repair-030 (VRS4341)

Effectivity

FIG/ITEM

PART NO.

01-010

3A2183

01-010

3A2265

01-010

3A2447

01-010

3A2533

Material of component

PART IDENT

IAE

SYMBOL

MATERIAL

LP turbine case

INCONEL 718

General

Price and availability - none

The practices and processes referred to in the procedure by the TASK number are in the SPM.

NOTE

For equipment and materials necessary to do this repair, refer to the SPM TASK 70-11-03-300-503, SPM TASK 70-23-05-230-501 and SPM TASK 70-39-03-390-501.
Equivalent equipment may be used.

NOTE

To identify the consumable materials, refer to the PCI.

NOTE

Special tools are identified in the procedure by the tool primary number.

NOTE

  1. If only the rivets are damaged or loose and must be replaced the intrascope boss must not be removed from the LP turbine case.

  2. If the intrascope boss must be replaced it must be removed completely from the LP turbine case.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
DrillLOCALDrill
Hand held grinderLOCALHand held grinder
Machine riveting equipmentLOCALMachine riveting equipment

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 03-026 LIQUID NITROGENLOCALCoMat 03-026

Spares

NameManufacturerPart Number / IdentificationQuantityRemark
Intrascope boss3A21902
RivetAN1233378

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-21-350-001 Remove the Intrascope Boss

      1. Remove the rivets.

      1. Refer to Figure.

        Drill or grind off heads.

        Do not damage LP turbine case during this procedure.

        Hit through remainder of rivet shafts.

        Use minimum of force to prevent damage of the case assembly.

      2. Remove the intrascope boss.

      1. Intrascope boss is located using an interference fit.

        Use minimum of force to prevent damage of the case assembly.

        Refer to Figure.

    2. SUBTASK 72-50-21-230-001 Examine the Local Surfaces for Cracks

      1. Do the test for cracks.

      1. Refer to the SPM TASK 70-23-05-230-501.

        Use medium sensitivity level.

        No cracks are permitted.

    3. SUBTASK 72-50-21-110-001 Clean the LP Turbine Case

      1. Aqueous degrease.

      1. Refer to the SPM TASK 70-11-03-300-503.

    4. SUBTASK 72-50-21-220-001 Examine the Location Diameter in the LP Turbine Case

      1. Dimensionally examine the intrascope location diameter.

      1. For actual dimensions.

        Refer to Figure.

      2. Examine for scratches in the bore.

      1. Fine scratches are permitted.

      3. Dimensionally examine the rivet holes.

      1. For actual dimensions.

        Refer to Figure.

    5. SUBTASK 72-50-21-220-002 Examine the Replacement Intrascope Boss Location Diameter

      1. Dimensionally examine the intrascope boss location diameter.

      1. Resultant interference fit between case hole and intrascope boss diameter to be 0.0007 to 0.0017 in. (0.0178 to 0.0432 mm).

        Selective assembly of replacement intrascope boss is permitted to get necessary fit.

    6. SUBTASK 72-50-21-320-001 Fit Replacement Intrascope Boss into Position on LP Turbine Case

      1. Freeze the replacement intrascope boss.

      1. Freeze the intrascope boss for easier replacement into the LP turbine case intrascope boss hole.

      2. Fit the replacement intrascope boss into position.

      1. Refer to Figure.

        Make sure that intrascope boss is installed correct and that rivet holes are aligned.

      3. Attach the intrascope boss with the rivets.

      1. Refer to Figure and the SPM TASK 70-39-03-390-501 for machine riveting procedure.

    7. SUBTASK 72-50-21-220-003 Do the Post Repair Inspection

      1. Dimensionally examine the quality of machine riveting and the joint produced.

      1. For acceptance standards.

        Refer to the SPM TASK 70-39-03-390-501.

    8. Figure: Replacement of rivets and intrascope boss on the LP turbine case

    Sheet 1

    Legend
    Replacement of rivets and intrascope boss on the LP turbine case

    Sheet 1

    Close

    Figure: Replacement of rivets and intrascope boss on the LP turbine case

    Sheet 2

    Legend
    Replacement of rivets and intrascope boss on the LP turbine case

    Sheet 2

    Close

    Figure: Replacement of rivets and intrascope boss on the LP turbine case

    Sheet 3

    Legend
    Replacement of rivets and intrascope boss on the LP turbine case

    Sheet 3

    Close

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised note to remove "materials or". (PSAF 15VC314)

Link not Found
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Link not Found
Link not Found
Manufacturer Code:LOCAL
Supply Number:CoMat 03-026
Type:sp01
Supply Short Name:CoMat 03-026 LIQUID NITROGEN
Supply Name:CoMat 03-026 LIQUID NITROGEN
Specification Groups:
Doc NumberType
OMAT:220BB-N-411 T2GBC1
JCR-135BB-N-411 T2GBC1
Suppliers:
ManufacturerRemarks
LOCAL
U2046
U2096
Manufacturer Code:LOCAL
Tool Number:Drill
Tool Name:Drill
Manufacturer Code:LOCAL
Tool Number:Hand held grinder
Tool Name:Hand held grinder
Manufacturer Code:LOCAL
Tool Number:Machine riveting equipment
Tool Name:Machine riveting equipment