TASK 72-42-11-200-001-B00 Diffuser Case - Examine, Inspection-001

DMC:V2500-A0-72-42-1100-00B-300A-B|Issue No:009.00|Issue Date:2020-11-01

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 72-42-11-200-001-B00 Diffuser Case - Examine, Inspection-001

Effectivity

FIG/ITEM

PART No.

01-010

2A2081-01

01-010

2A2081-101

01-010

2A2081-201

01-010

2A2081-301

01-010

2A2081-401

01-010

2A2581-01

01-010

2A2581-101

01-010

2A2581-201

01-010

2A2581-301

01-010

2A2581-401

01-010

2A2885-01

01-010

2A2885-101

01-010

2A2885-201

01-010

2A2885-301

01-010

2A2885-401

01-010

2A2891-01

01-010

2A2891-101

01-010

2A2891-201

01-010

2A2891-301

01-010

2A2891-401

01-010

2A2897-01

01-010

2A2897-101

01-010

2A2897-201

01-010

2A2897-301

01-010

2A2897-401

General

This TASK gives the procedure for the inspection of the diffuser case assembly.

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

Refer to SPM TASK 70-20-00-200-501 for General Inspection Information.

All parts must be visually examined for cracks, damage, corrosion and wear. For any defects that are not identified in the procedure, contact IAE Tech Services.

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.

Surface Texture, SPM TASK 70-35-09-350-501.

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.

NOTE

To identify the consumable materials refer to the PCI.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Black lightLOCALBlack light
Borescope probeLOCALBorescope probe
Small (dental) mirrorLOCALSmall (dental) mirror
Small (dental) pickLOCALSmall (dental) pick
Standard comparatorLOCALStandard comparator
10X magnifierLOCAL10X magnifier
Vacuum or compressed air deviceLOCALVacuum or compressed air device

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 05-112 EMERY POLISHING PAPERLOCALCoMat 05-112

(400 grit)

CoMat 05-113 EMERY POLISHING PAPERLOCALCoMat 05-113

(600 grit)

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-42-11-230-054-002 Prepare the Diffuser Case Assembly (01-010) for Crack Inspection

      CAUTION

      THE REAR OUTER FLANGE AND REAR OUTER FLANGE BOLTHOLES OF THE DIFFUSER CASE ASSEMBLY ARE VERY IMPORTANT AREAS WHERE YOU FIND CRACKS. MAKE SURE YOU CLEAN AND EXAMINE THESE AREAS CAREFULLY BY SUBTASK 72-42-11-230-054-002 AND SUBTASK 72-42-11-230-055. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN INCREASE THE POSSIBILITY OF NOT IDENTIFYING A CRACK THAT CAN CAUSE MORE DAMAGE.

      NOTE

      The Rear Outer Flange and Rear Outer Flange boltholes of the Diffuser Case Assembly are very important areas where you find cracks. The Diffuser Case Rear Outer Flange is cycle limited and need to do maintenance by flange replacement by TASK 05-10-00-990-000-A00 and TASK 05-10-00-990-000-B00.

    1. Clean the Part. Refer to (CLEANING-000) TASK 72-42-11-100-000.

      NOTE

      When you clean the Diffuser Case make sure to check that the Very Important Areas of the Rear Outer Flange and Rear Outer Flange Boltholes are free of all contaminants. These areas are shown in Figure and Figure.

    2. Do the test for cracks given in SPM TASK 70-23-08-230-501.

    2. SUBTASK 72-42-11-230-055 Examine the Diffuser Case Assembly (01-010) for Cracks

      NOTE

      The Rear Outer Flange and Rear Outer Flange boltholes of the Diffuser Case Assembly are very important areas where you find cracks. Examine these areas carefully.

    1. Refer to Figure.

    2. Be careful when you examine the strut leading edges, the flow path areas around the strut leading edges, radii, the intersection of the fuel nozzle pad machined bores and the inner wall.

    3. Examine under a Black light. Make a mark on defects that will cause you to reject the part. Make another mark on defects that you need to examine more.

    4. Examine very important areas slowly so you can find small linear indications. Use a small mirror or a borescope (or both) to examine any areas that are not easy to see.

    5. If there are indications that look like unwanted material, use a small pick to remove it.

    6. Back-to-back indications through the case wall are not permitted.

      7. If you find indications in very important areas and you are not sure whether to reject the part, do the steps that follow:

      2. Remove the dust with a compressed air or vacuum device.

      3. Do the test for cracks given in the SPM TASK 70-23-05-230-501.

      8. If the diffuser case is not in the limits given in Figure

      1. Repair, VRS3039 TASK 72-42-11-300-012 (REPAIR-012).

    3. SUBTASK 72-42-11-220-062 Examine the Diffuser Case Assembly (01-010) for Damage

    1. CAUTION

      THE REAR OUTER FLANGE AND REAR OUTER FLANGE BOLTHOLES OF THE DIFFUSER CASE ASSEMBLY ARE VERY IMPORTANT AREAS WHERE YOU FIND CRACKS. MAKE SURE YOU CLEAN AND EXAMINE THESE AREAS CAREFULLY BY SUBTASK 72-42-11-230-054-002 AND SUBTASK 72-42-11-230-055. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN INCREASE THE POSSIBILITY OF NOT IDENTIFYING A CRACK THAT CAN CAUSE MORE DAMAGE.

      Refer to Figure.

      2. Examine the diffuser case for damage.

        1. Warps and dents.

          1. Warps and dents are smooth with no crack indications and are less than 0.050 in. (1.27 mm) in depth.

          1. Accept.

          2. Other than (Step).

          1. Repair, VRS3061 TASK 72-42-11-300-024 (REPAIR-024).

        2. Nicks.

          1. Not more than 0.010 in. (0.25 mm) in depth with no high metal.

          1. Accept.

          2. Other than (Step)

          1. Repair, VRS3061 TASK 72-42-11-300-024 (REPAIR-024).

        3. Burns.

        1. Repair, VRS3061 TASK 72-42-11-300-024 (REPAIR-024).

        4. Threads with high metal, burrs or damage

        1. Repair, VRS3026 TASK 72-42-11-300-002 (REPAIR-002)

        5. Borescope threads with high metal, burrs or damage

        1. Repair, VRS3058 TASK 72-42-11-300-021 (REPAIR-021)

        6. Burner pin boss thread damage

        1. Repair, VRS3739 TASK 72-42-11-300-031 (REPAIR-031)

        7. Ps3 boss threads with high metal, burrs or damage

        1. Repair, VRS3715 TASK 72-42-11-300-030 (REPAIR-030)

        8. Worn flange boltholes.

          1. Less than 0.020 in. (0.51 mm) wear if the worn surface is smooth and gradual. There must be no sharp edges, grooves or high metal.

          1. Accept.

          2. Wear that is more than 0.020 in. (0.51 mm) and less than 0.070 in. (1.78 mm) on the front outer flange boltholes.

          1. Repair, VRS3039 TASK 72-42-11-300-012 (REPAIR-012).

          3. Wear that is more than 0.020 in. (0.51 mm) on the rear outer flange.

          1. Repair, VRS3061 TASK 72-42-11-300-024 (REPAIR-024).

          4. Other than (Step), (Step) and (Step).

          1. Reject.

        9. Wear on oil supply inner boss bore.

        1. Repair, VRS3061 TASK 72-42-11-300-024 (REPAIR-024) or Repair, VRS3647 TASK 72-42-11-300-026 (REPAIR-026).

        10. Wear on the internal cavities of strut, refer to Figure.

          1. Wear not less than 0.010 in. (0.25 mm) in depth (not more than two blends on all of the case).

          1. Repair, VRS3777 TASK 72-42-11-300-035 (REPAIR-035).

          2. Wear more than 0.010 in. (0.25 mm) in depth.

          1. Reject.

        11. Igniter boss threads with high metal, burrs or damage, or sleeves that are loose, missing or damaged.

        1. Refer to Repair, VRS3819 TASK 72-42-11-300-036 (REPAIR-036).

    4. SUBTASK 72-42-11-220-063 Examine the Diffuser Case Assembly (01-010) for Looseness and Wear on the Sleeves

    1. Refer to Figure

      2. Examine the diffuser case at location 2 for looseness of the sleeves.

        1. Looseness

        1. Repair, VRS3279 TASK 72-42-11-300-025 (REPAIR-025)

      3. Examine the diffuser case at location 1 for wear on the spherical diameter of the sleeve (2 locations).

        1. Wear.

          1. The spherical diameter is a minimum of 0.829 in. (21.057 mm)

          1. Accept

          2. Other than (a)

          1. Repair, VRS3279 TASK 72-42-11-300-025 (REPAIR-025)

      4. Examine the diffuser case at location 3 for looseness of the sleeve.

        1. Looseness

        1. Repair, VRS3041 TASK 72-42-11-300-014 (REPAIR-014)

      5. Examine the diffuser case at location 4 for wear on the spherical diameter of the sleeve.

        1. Wear.

          1. The spherical diameter is a minimum of 1.949 in. (49.505 mm).

          1. Accept.

          2. Other than (Step).

          1. Repair, VRS3041 TASK 72-42-11-300-014 (REPAIR-014).

    5. SUBTASK 72-42-11-220-064 Examine the Diffuser Case Assembly (01-010) for Looseness and Damaged Threads on the Inserts

    1. Refer to Figure and Figure.

      2. Examine the diffuser case at Location 1 for looseness and damaged threads on the inserts (64 locations).

        1. Looseness or damaged threads.

        1. Repair, VRS3059 TASK 72-42-11-300-022 (REPAIR-022).

      3. Examine the diffuser case at Location 1 for looseness and damaged threads on the inserts (jack screw hole pattern: eight holes, four equally spaced groups of two holes).

        1. Looseness or damaged threads

        1. Repair, VRS3749 TASK 72-42-11-300-034 (REPAIR-034)

    6. SUBTASK 72-42-11-220-065 Examine the Diffuser Case Assembly (01-010) for Loose or Damaged Front and Rear Pins

    1. Refer to Figure

      2. Examine the diffuser case at Locations 1 and 2 for loose or damaged pins.

        1. Loose or damaged pins

        1. Repair, VRS3060 TASK 72-42-11-300-023 (REPAIR-023)

    7. SUBTASK 72-42-11-220-066 Examine the Diffuser Case Assembly (01-010) for Damaged Gang Nut Channel Assemblies

    1. Refer to Figure

      2. Examine the diffuser case at Location 1 for damaged gang nut channel assemblies.

        1. Damaged gang nut channel assemblies.

          1. Nut channels are properly attached with the correct number of rivets and there are no loose rivets

          1. Accept

          2. The nuts are correctly installed with no damaged threads

          1. Accept

          3. Other than (a) and (b)

          1. Repair, VRS3025 TASK 72-42-11-300-001 (REPAIR-001)

    8. SUBTASK 72-42-11-220-067 Examine the Diffuser Case Assembly (01-010) for Loose and Damaged Threads on the Front Inside Diameter Flange Nuts

    1. Refer to Figure

      2. Examine the diffuser case at Location 1 for loose and damaged threads on the front inside diameter flange nuts.

        1. Loose or damaged threads

        1. Repair, VRS3028 TASK 72-42-11-300-003 (REPAIR-003)

    9. SUBTASK 72-42-11-220-086 Examine the Diffuser Case Assembly (01-010) for Axial Length

    1. NOTE

      The dimensions that follow apply when Surface K and N are flat by 0.005 in. (0.13 mm); the diameter at Location 2242 maintains a clearance envelope of 25.210 in. (640.33 mm) and the diameter at Location 2252 maintains a clearance envelope of 28.226 in. (716.94 mm) in a free or a held condition. Hold the part only on Surfaces K, L, M and N and the diameters at Locations 2242 and 2252.

      Refer to Figure.

      2. Examine the diffuser case at Location A for axial length between the front and rear outer flanges.

        1. If the length is between 15.126 in. and 15.132 in. (384.20 mm and 384.35 mm).

        1. Accept

        2. Write down the dimension of the length.

        2. Other than Step.

        1. Repair, VRS3600 TASK 72-42-11-300-027 (REPAIR-027) or Repair, VRS3752 TASK 72-42-11-300-032 (REPAIR-032).

      3. Examine the diffuser case at Location B for axial length between the front outer flange and rear inner flange.

        1. If the length is between 13.576 in. and 13.582 in. (344.83 mm and 344.98 mm).

        1. Accept.

        2. Write down the dimension of the length.

        2. Other than (1)

        1. Repair, VRS3682 TASK 72-42-11-300-029 (REPAIR-029) or Repair, VRS3752 TASK 72-42-11-300-032 (REPAIR-032).

      4. Examine the diffuser case at Location C for axial length between the front outer flange front face and the front inner flange front face.

        1. If the length is between 1.388 in. and 1.392 in. (35.26 mm and 35.36 mm)

        1. Accept.

        2. Write down the dimension of the length.

        2. Other than Step.

        1. Repair, VRS3753 TASK 72-42-11-300-033 (REPAIR-033) or Repair, VRS3752 TASK 72-42-11-300-032 REPAIR-032.

    10. SUBTASK 72-42-11-220-068 Examine the Diffuser Case Assembly (01-010) for the Diameters

    1. Refer to Figure.

      NOTE

      The dimensions that follow apply when Surfaces K and N are flat by 0.005 in. (0.13 mm), the diameter at Location 2242 maintains a clearance envelope of 25.210 in. (640.33 mm) and the diameter at Location 2252 maintains a clearance envelope of 28.226 in. (716.94 mm) in a free or a held condition. Hold the part only on Surfaces K, L, M and N and the diameters at Locations 2242 and 2252.

      2. Examine the diffuser case at Location 2242 for wear and concentricity of the front outside diameter.

        1. If the non-select (worn) diameter is between 25.204 in. and 25.209 in. (640.18 mm and 640.31 mm) in a held condition and is between 25.174 in. and 25.239 in. (639.42 mm and 641.07 mm) in a free condition.

        1. Accept

        2. Write down the dimension of the diameter.

        2. If the select fit dimension is between 25.199 in. and 25.209 in. (640.05 mm and 640.31 mm) in a held condition and is between 25.174 in. and 25.239 in. (639.42 mm and 641.07 mm) in a free condition

        1. Accept part for select fit only

        2. Write down the dimension of the diameter.

          NOTE

          This part can be used only if the mating part has a diameter that will result in fit of reference No. 2242. Refer to TASK 72-00-42-420-001 (INSTALLATION-001).

        3. Other than (2)

        1. Repair, VRS3033 TASK 72-42-00-300-007 (REPAIR-007)

      3. Examine the diffuser case at Location 2252 for wear and concentricity of the rear outside diameter.

        1. If the non-select (worn) diameter is between 28.227 in. and 28.233 in. (716.97 mm and 717.12 mm) and is in true position in relation to the diameter at Location 2244 by 0.008 in. (0.20 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. If the select fit dimension is between 28.222 in. and 28.233 in. (716.84 mm and 717.12 mm) and is in true position in relation to the diameter at Location 2244 by 0.008 in. (0.20 mm)

        1. Accept part for select fit only

        2. Write down the dimension of the diameter.

          NOTE

          This part can be used only if the mating part has a diameter that will result in fit of reference No. 2242. Refer to TASK 72-00-44-420-001-001 (INSTALLATION-001) or 72-40-00-430-005 (ASSMBLY-005).

        3. Other than Step.

        1. Repair, VRS3056 TASK 72-42-11-300-019 (REPAIR-019).

      4. Examine the diffuser case at Location 2056 for wear and concentricity of the rear inside diameter.

        1. The diameter is 13.337 in. to 13.343 in. (338.759 mm to 338.912 mm) and is in true position in relation to the diameter at Location 2242 by 0.004 in. (0.102 mm)

        1. Accept.

        2. Other than (1)

        1. Repair, VRS3052 TASK 72-42-11-300-017 (REPAIR-017)

      5. Examine the diffuser case at Location 2244 for wear and concentricity of the front inside diameter seal diameter.

        1. If the non-select (worn) diameter is between 16.899 in. and 16.901 in. (429.23 mm and 429.29 mm) and is in true position in relation to the diameter at Location 2242 by 0.004 in. (0.10 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. If the select fit dimension is between 16.894 in. and 16.901 in. (429.11 mm and 429.29 mm) and is in true position in relation to the diameter at Location 2242 by 0.004 in. (0.10 mm)

        1. Accept part for select fit only

        2. Write down the dimension of the diameter.

          NOTE

          This part can be used only if the mating part has a diameter that will result in fit of reference No. 2244. Refer to V2500-A0-72-42-0000-00A-710A-B (ASSEMBLY).

        3. Other than (2)

        1. Repair, VRS3035 TASK 72-42-00-300-009 (REPAIR-009)

      6. Examine the diffuser case at Location 2243 for wear and concentricity of the front inside diameter stator diameter.

        1. If the non-select (worn) diameter is between 20.668 in. and 20.672 in. (524.97 mm and 525.07 mm) and is in true position in relation to the diameter at Location 2244 by 0.004 in. (0.10 mm)

        1. Accept

        2. Write down the dimension of the diameter.

        2. If the select fit dimension is between 20.661 in. and 20.672 in. (524.79 mm and 525.07 mm) and is in true position in relation to the diameter at Location 2244 by 0.004 in. (0.10 mm)

        1. Accept part for select fit only

        2. Write down the dimension of the diameter.

          NOTE

          This part can be used only if the mating part has a diameter that will result in fit of reference No. 2243. Refer to V2500-A0-72-42-0000-00A-710A-B (ASSEMBLY).

        3. Other than Step.

        1. Repair, VRS3046 TASK 72-42-11-300-015 (REPAIR-015).

    11. Figure: Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 1

    Legend
    Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 1

    Close

    Figure: Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 2

    Legend
    Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 2

    Close

    Figure: Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 3

    Legend
    Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 3

    Close

    Figure: Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 4

    Legend
    Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 4

    Close

    Figure: Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 5

    Legend
    Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 5

    Close

    Figure: Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 6

    Legend
    Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 6

    Close

    Figure: Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 7

    Legend
    Diffuser Case Assembly Fluorescent Penetrant Inspection Locations

    Sheet 7

    Close

    Figure: Diffuser Case Assembly Inspection Locations

    Diffuser Case Assembly Inspection Locations

    Figure: Diffuser Case Assembly Inspection Locations

    Sheet 1

    Legend
    Diffuser Case Assembly Inspection Locations

    Sheet 1

    Close

    Figure: Diffuser Case Assembly Inspection Locations

    Sheet 2

    Legend
    Diffuser Case Assembly Inspection Locations

    Sheet 2

    Close

    Figure: Diffuser Case Assembly Inspection Locations

    Diffuser Case Assembly Inspection Locations

    Figure: Diffuser Case Assembly Inspection Locations

    Diffuser Case Assembly Inspection Locations

    Figure: Diffuser Case Assembly Inspection Locations

    Diffuser Case Assembly Inspection Locations

    Figure: Diffuser Case Assembly Inspection Locations

    Diffuser Case Assembly Inspection Locations

    Figure: Diffuser Case Assembly Inspection Locations

    Diffuser Case Assembly Inspection Locations

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Added post SB 72-0709 part numbers and revised caution, note and figure. (18VC269B)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:K6835
Supply Number:CoMat 05-112
Type:sp01
Supply Short Name:CoMat 05-112 EMERY POLISHING PAPER
Supply Name:CoMat 05-112 EMERY POLISHING PAPER
Specification Groups:
Doc NumberType
FEPA GRIT SIZE P500 EMERY POLISHING PAPER OR ALUMINUM OXIDE ABRASIVE PAPER
Suppliers:
ManufacturerRemarks
K6835
KC1D9
LOCAL
Manufacturer Code:KC1D9
Supply Number:CoMat 05-113
Type:sp01
Supply Short Name:CoMat 05-113 EMERY POLISHING PAPER
Supply Name:CoMat 05-113 EMERY POLISHING PAPER
Specification Groups:
Doc NumberType
FEPA GRIT SIZE P600 EMERY POLISHING PAPER OR ALUMINUM OXIDE ABRASIVE PAPER
Suppliers:
ManufacturerRemarks
KC1D9
LOCAL
Manufacturer Code:LOCAL
Tool Number:10X magnifier
Tool Name:10X magnifier
Manufacturer Code:LOCAL
Tool Number:Black light
Tool Name:Black light
Manufacturer Code:LOCAL
Tool Number:Borescope probe
Tool Name:Borescope probe
Manufacturer Code:LOCAL
Tool Number:Small (dental) mirror
Tool Name:Small (dental) mirror
Manufacturer Code:LOCAL
Tool Number:Small (dental) pick
Tool Name:Small (dental) pick
Manufacturer Code:LOCAL
Tool Number:Standard comparator
Tool Name:Standard comparator
Manufacturer Code:LOCAL
Tool Number:Vacuum or compressed air device
Tool Name:Vacuum or compressed air device