TASK 72-45-25-200-004-D00 HPT Stage 2 Duct Segment - Examine, Inspection-004

DMC:V2500-A0-72-45-2501-00C-300A-C|Issue No:003.00|Issue Date:2019-08-01

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 72-45-25-200-004-D00 HPT Stage 2 Duct Segment - Examine, Inspection-004

Effectivity

FIG/ITEM

PART NO.

01-060

2A3392

General

This TASK gives the procedure for the inspection of the stage 2 HPT duct segment.

The policy that is necessary for inspection is given in SPM TASK 70-20-00-200-501.

All the parts must be cleaned before any is examined. Refer to TASK 72-45-25-100-000 (CLEANING-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 test before the part is visually inspected.

Do not discard any part until you are sure there are no repairs available. Refer to the instructions in Repair befor 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 SPM.

References

Refer to SPM for data on these items.

Definitions of damage, SPM TASK 70-02-02-350-501.

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 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 72-45-25-230-064 Examine the Stage 2 HPT Duct Segments (01-060) for Cracks

    1. Refer to Figure, Figure and Figure.

      2. Clean the part.

      1. Refer to TASK 72-45-25-100-000 (CLEANING-000).

        2. Do the test for cracks on the part that is given below. Examine the metal surfaces. Do not examine the ceramic and metallic coated areas at Location 1. Use the penetrant procedure below.

          PART IDENT

          TASK/SUBTASK

          Stage 2 HPT duct segment

          1. Cracks in the hook web material.

          1. Axial cracks less than 0.005 in. (0.13 mm) width and less than 0.100 in. (2.54 mm) depth in the material between hooks are permitted. Cracks are permitted to a maximum of the vertical wall of the hook or the radius of the W seal groove. Refer to Figure and Figure for permitted limits. No more than one crack is permitted between each hook.

          2. All other base material crack.

          1. Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

    2. SUBTASK 72-45-25-220-098 Examine the Stage 2 HPT Duct Segments (01-060) for Conditions Indicated

    1. Refer to Figure.

      NOTE

      Erosion is the condition of the top porous layer of ceramic when it becomes rough or is missing from wear.

      2. Examine the duct segment surface at Location 1 for spalling, erosion, cracking, crazing and burning.

        1. Spalling.

          1. Spalling is outside the blade path.

          1. Accept.

          2. Spalling is in the blade path. Damage is down to the metallic layer.

          1. Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

        2. Any amount of erosion if the blade tip clearance is in limits.

        1. Accept.

        3. Mudflat cracks or crazing.

        1. Accept.

        4. Burns.

          1. Not more than 0.005 in. (0.13 mm) in depth.

          1. Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

      3. Examine the duct segment layers at Location 2 for separation, material transfer and deformation.

        1. Separation.

          1. Total maximum length of all cracks is 3.00 in. (76.2 mm) for each seal in the ceramic layer only.

          1. Accept.

          2. Separation is in the bondline or cermet layer.

          1. Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

        2. Blade tip material transfer.

          1. Not more than 0.500 in. (12.70 mm) axially if the blades are to be replaced.

          1. Remove blade material or Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

        3. Deformation (bow) burning.

        1. Reject.

      4. Examine the duct segment all over at Location 3 for bent or missing tabs, erosion or damaged or missing coating.

        1. Bent or missing tabs.

        1. Reject.

        2. Melted base material.

          1. Not more than 0.005 in. (0.13 mm) on the ID gaspath, shiplap edges and the perimeter of the gaspath surface.

          1. Accept.

          2. Areas other than in (a).

          1. Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

        3. Coating that is damaged or missing.

        1. Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

    3. SUBTASK 72-45-25-220-099 Examine the Stage 2 HPT Duct Segments (01-060) for Corrosion, Dents, Erosion, Nicks and Pits on the Base Metal Surfaces

    1. Refer to Figure.

      2. Examine the duct segment at Locations 1 thru 5 for corrosion, dents, erosion, nicks and pits on all base metal surfaces.

        1. Corrosion, dent, erosion, nicks and pits.

          1. Hooks - Location 5 - nicks, dents, gouges and similar surface imperfections are permitted to 0.005 in. (0.13 mm) depth, if they are smooth-bottomed and not in the fillet radii. Outside of the fillet radii and ID surfaces, isolated surface imperfections are permitted to 0.040 in. (1.02 mm) depth if they are smooth-bottomed and no two adjacent hooks are affected. The total affected area on each hook is less than 0.016 sq in. (10.32 sq mm) and no imperfection spans more than 0.100 in. (2.54 mm) circumferentially. For hooks with multiple surface imperfections only one may be greater than 0.005 in. (0.13 mm) deep.

          1. Accept.

          2. Sealing surfaces - Locations 1, 3, 4 - nicks, dents, gouges and similar surface imperfections are permitted to 0.005 in. (0.13 mm) depth.

          1. Accept.

          3. Shiplap surfaces -Locations 2 - nicks, dents, gouges and similar surface imperfections are permitted to 0.005 in. (0.13 mm) depth, if they are smooth-bottomed and not in the fillet radii, isolated surface imperfections are permitted to 0.040 in. (1.02 mm) depth, if they are smooth-bottomed, the total affected area is less than 0.016 in. (0.406 mm) and no imperfection spans more than 0.100 in. (2.54 mm) axially. For multiple surface imperfections, only one may be greater than 0.005 in. (0.13 mm) deep.

          1. Accept.

          4. All other surfaces - nicks, dents, gouges and similar surface imperfections are permitted to 0.005 in. (0.13 mm) depth, if they are smooth-bottomed. Isolated surface imperfections are permitted to 0.040 in. (1.02 mm) depth if fillet radii, cooling holes and hook web are not affected, the imperfection is smooth-bottomed, and the total affected area is less than 0.050 sq in. (32.26 sq mm). All imperfections greater than 0.005 in. (0.13 mm) in depth must be separated by 0.010 in. (0.25 mm) minimum. Imperfections on axial and circumferential faces spanning more half of the face width are not permitted.

          1. Accept.

          5. Other than (a), (b), (c), (d).

          1. Repair, VRS3722 TASK 72-45-25-300-011 (REPAIR-011) or Repair, VRS3614 TASK 72-45-25-300-008 (REPAIR-008).

    4. Figure: Stage 2 HPT Duct Segment Inspection Locations

    Stage 2 HPT Duct Segment Inspection Locations

    Figure: Stage 2 HPT Duct Segment Inspection Locations

    Stage 2 HPT Duct Segment Inspection Locations

    Figure: Stage 2 HPT Duct Segment Inspection Locations

    Stage 2 HPT Duct Segment Inspection Locations

    Figure: Stage 2 HPT Duct Segment Inspection Locations

    Stage 2 HPT Duct Segment Inspection Locations

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised step. (19VC107)