TASK 72-00-42-220-002 Combustion System - Examine The Diffuser Case Assembly Rear Face at Interface J-42, Inspection-002

DMC:V2500-A0-72-00-4200-01A-300A-B|Issue No:002.00|Issue Date:2018-11-01

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 72-00-42-220-002 Combustion System - Examine The Diffuser Case Assembly Rear Face at Interface J-42, Inspection-002

General

The word 'reject' after an interface inspection statement requires that further detailed inspection or repair as applicable, of the affected area be accomplished using data in the applicable ATA section of the part in question. Contact IAE for FAA approved data if the referenced TASK is not in the manual.

Refer to TASK 72-00-00-200-001 (examine the modular/non-modular interfaces) before you do this TASK.

The policy that is necessary for inspection is given in TASK 70-20-01-200-501.

Interface limit definitions.

Nick - A small area of local displacement of metal usually caused by contact with another object. There is no distortion to the adjacent metal.

Dent - A surface depression made by contact with another object and can possibly have local distortion of the adjacent metal.

Warp - A local area of metal twisted or damaged from it's original shape. For this applicable function warps cause metal movement of less than 0.050 in. (0.270 mm).

Distortion - An area (larger than a warp) of metal damaged from it's original shape. For this applicable function, distortion can cause metal movement more than 0.050 in. (0.270 mm).

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
10X magnifierLOCAL1

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-00-42-220-062 Visually Examine the Doweled End Bolts at Location 1

      NOTE

      If the outer combustion chamber assembly was removed (TASK 72-00-42-020-001-001), you can do the inspection that follows.

    1. Refer to Figure.

      2. Bent, damaged or worn.

      1. Reject.

      3. Damaged threads.

      1. Reject.

    2. SUBTASK 72-00-42-220-063 Visually Examine the Outer Surface of the Diffuser Case Assembly at Location 2 and the Inner Surface of the Diffuser Case Assembly at Location 6

    1. Refer to Figure.

      2. Smooth, warps or dents with no cracks up to 0.050 in. (0.270 mm) in depth.

      1. Accept.

      3. Round bottom nicks up to 0.025 in. (0.635 mm) in depth.

      1. Accept.

      4. Scratches up to 0.010 in. (0.254 mm) in depth.

      1. Accept.

      5. Surface damage more than Step, Step, or Step.

      1. Reject.

      6. Distortion and/or cracks.

      1. Reject.

    3. SUBTASK 72-00-42-220-064 Visually Examine the Outer Flange of the Diffuser Case Assembly at Location 3

      NOTE

      The Outer Flange of the Diffuser Case Assembly at Location 3 is a Very Important Area where cracking has been observed. Inspect this area carefully.

      NOTE

      If the Outer Flange nuts and bolts are installed you must inspect the Outer Flange of the Diffuser Case for cracking.

      NOTE

      If the stage 1 turbine nozzle assembly was removed (TASK 72-00-44-020-001-001), you can do the inspection that follows.

    1. Refer to Figure.

    2. Examine the exposed areas of the Outer Flange on the Diffuser Case Assembly at Location 3 for cracking carefully using a white light and 10X magnifier so you can find small linear indications.

      3. Smooth, warps or dents with no cracks up to 0.050 in. (0.270 mm) in depth.

      1. Accept.

      4. Round bottom nicks up to 0.025 in. (0.635 mm) in depth.

      1. Accept.

      5. Scratches up to 0.010 in. (0.254 mm) in depth.

      1. Accept.

      6. Surface damage more than Step, Step, or Step.

      1. Reject.

      7. Distortion and/or cracks.

      1. Reject.

    4. SUBTASK 72-00-42-220-065 Visually Examine the Outer Flange Dowel Pin and the Boltholes on the Diffuser Case Assembly at Location 4

      NOTE

      The Outer Flange Boltholes at Location 4 are Very Important Areas where cracking has been observed. Inspect these areas.

      NOTE

      If the Outer Flange nuts and bolts are removed you must inspect the Rear Outer Flange Boltholes for cracking.

      NOTE

      If the stage 1 turbine nozzle assembly was removed (TASK 72-00-44-020-001-001), you can do the inspection that follows.

    1. Refer to Figure.

      2. Loose or missing dowel pin.

      1. Reject.

      3. Cracked boltholes.

      1. Reject.

      4. Boltholes with less than 0.010 in. (0.254 mm) wear. Worn surface must be smooth and continuous. No sharp edges, grooves or high metal permitted.

      1. Accept.

    5. SUBTASK 72-00-42-220-100 Examine the Outer Flange Boltholes on the Diffuser Case Assembly for Cracks at Location 4

      NOTE

      The Outer Flange Boltholes at Location 4 are Very Important Areas where cracking has been observed. Inspect these areas carefully.

      NOTE

      If the Outer Flange Bolthole nuts and bolts are removed you must do the inspection that follows.

    1. Refer to Figure.

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

    3. Examine the Diffuser Case Flange Boltholes carefully using 10X magnifier so you can find small linear indications.

      4. If any indications are found in the boltholes.

      1. Reject.

    6. SUBTASK 72-00-42-220-066 Measure the Diameter of the Outer Flange of the Diffuser Case Assembly at Location 5

      NOTE

      If the stage 1 turbine nozzle assembly was removed (TASK 72-00-44-020-001-001), you can do the inspection that follows.

    1. Refer to Figure.

      2. Diameter less than 28.237 in. (717.220 mm).

      1. Accept.

      3. Other than Step.

      1. Reject.

    7. SUBTASK 72-00-42-220-067 Visually Examine the Inner Flange of the Diffuser Case Assembly at Location 7

      NOTE

      If the No.4 bearing and rear compartment parts were removed (TASK 72-00-43-020-001), you can do the inspection that follows.

    1. Refer to Figure.

      2. Smooth, warps or dents with no cracks up to 0.050 in. (0.270 mm) in depth.

      1. Accept.

      3. Round bottom nicks up to 0.025 in. (0.635 mm) in depth.

      1. Accept.

      4. Scratches up to 0.010 in. (0.254 mm) in depth.

      1. Accept.

      5. Surface damage more than Step, Step or Step.

      1. Reject.

      6. Distortion and/or cracks.

      1. Reject.

    8. SUBTASK 72-00-42-220-068 Measure the Inner Rear Flange Diameter of the Diffuser Case Assembly at Location 8

      NOTE

      If the No.4 bearing and rear compartment parts were removed (TASK 72-00-43-020-001), you can do the inspection that follows.

    1. Refer to Figure.

      2. Diameter.

        1. Up to 13.347 in. (339.014 mm).

        1. Accept.

        2. Other than Step.

        1. Reject.

    9. SUBTASK 72-00-42-220-069 Visually Examine the Inner Surface of the Diffuser Case Assembly at Location 10

      NOTE

      If the stage 1 turbine nozzle assembly was removed (TASK 72-00-44-020-001-001), you can do the inspection that follows.

    1. Refer to Figure.

      2. Smooth, warps or dents with no cracks up to 0.050 in. (0.270 mm) in depth.

      1. Accept.

      3. Round bottom nicks up to 0.025 in. (0.635 mm) in depth.

      1. Accept.

      4. Scratches up to 0.010 in. (0.254 mm) in depth.

      1. Accept.

      5. Surface damage more than Step, Step, or Step.

      1. Reject.

      6. Distortion and/or cracks.

      1. Reject.

    10. SUBTASK 72-00-42-220-087 Visually Examine the Nut Channels on the Inner Flange of the Diffuser Case Assembly at Location 9

    1. Refer to Figure.

      2. Damaged.

      1. Reject.

      3. Missing.

      1. Reject.

      4. Damaged threads.

      1. Reject.

    11. Figure: Locations at interface J-42

    Locations at interface J-42

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedure to add text and update figure. (18VC269)

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
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