TASK 72-50-21-300-010 LPT Case - Replace The Borescope Boss And/or Damaged Rivets, Repair-010 VRS4013

DMC:V2500-A0-72-50-2101-01A-920A-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 72-50-21-300-010 LPT Case - Replace The Borescope Boss And/or Damaged Rivets, Repair-010 VRS4013

Effectivity

FIG/ITEM

PART NO.

01-010

3A0807

01-010

3A0990

01-010

3A0991

01-010

3A1908

Material of component

RR

DESCRIPTION

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 70-11-01-300-503, SPM TASK 70-23-05-230-501, SPM TASK 70-39-03-390-501.
Equivalent materials or equipment may be used.

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

Consumables, Materials and Expendables

NONE

Spares

NameManufacturerPart Number / IdentificationQuantityRemark
Intrascope boss3A05141
RivetAN1236854

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-21-350-083 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 assy.

      2. Remove the intrascope boss.

      1. Intrascope boss is located using an interference fit. Use minimum of force to prevent damage of the case assy.

        Refer to Figure.

    2. SUBTASK 72-50-21-230-086 Examine the Local Surfaces for Cracks

      1. Do the test for cracks.

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

        No cracks are permitted.

    3. SUBTASK 72-50-21-110-085 Clean the LP turbine Case

      1. Vapor degrease.

      1. Refer to the SPM TASK 70-11-01-300-503.

    4. SUBTASK 72-50-21-220-140 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 72-50-21-220-141 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 0.0017in. (0.0178 to 0.0432 mm). Selective assembly of replacement intrascope boss is permitted to get necessary fit.

    6. SUBTASK 72-50-21-320-061 Fit Replacement Intrascope Boss in to Position on LP Turbine Case

    1. Freeze the replacement intrascope boss.

      2. Fit the replacement intrascope boss in to 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 72-50-21-220-142 Do the Post Repair Inspection

      1. Visually examine the quality after machine riveting and the security of joints.

      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

    Replacement of rivets and intrascope boss on the LP turbine case

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

    Replacement of rivets and intrascope boss on the LP turbine case

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

    Replacement of rivets and intrascope boss on the LP turbine case

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial correction due to conversion

Link not Found
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Link not Found
Link not Found
Manufacturer Code:LOCAL
Tool Number:Drill
Tool Name:Drill
Manufacturer Code:LOCAL
Tool Number:Hand held grinder
Tool Name:Hand held grinder