TASK 72-41-31-200-002-C00 HPC Front Cases - Examine, Inspection-002

DMC:V2500-A0-72-41-3101-00C-300A-C|Issue No:007.00|Issue Date:2020-05-01

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 72-41-31-200-002-C00 HPC Front Cases - Examine, Inspection-002

Effectivity

FIG/ITEM

PART NO.

01-400

6A4439

General

This TASK gives the procedure for the inspection of the HP compressor front cases. For the other parts of the HP compressor front cases, refer to TASK 72-41-31-200-000 (INSPECTION-000).

Fig./item numbers in parentheses in the procedure agree with those used in the IPC. Only the primary Fig./item numbers are used. For the Service Bulletin alpha variants refer to the IPC.

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

All the parts must be cleaned before any part is examined.

All the 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 the parts which must have a crack test is given in Step. Do the crack test before a part is visually examined.

Do not discard any part until you are sure there are no repairs available. Refer to the instructions in repair before 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 can be shown to be necessary at a subsequent date.

All the 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/SUBTASK number are in SPM.

References

Refer to SPM for data on these items:

Definition of Damage, SPM TASK 70-02-02-350-501,

Inspection of Parts, SPM TASK 70-20-01-200-501.

Some data on these items is contained in this TASK. For more data on these items refer to the SPM.

Methods 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 72-41-31-230-083 Examine the HP Compressor Front Cases for Cracks

    1. Clean the parts. Refer to TASK 72-41-31-100-000 (CLEANING-000).

      2. Do the test for cracks on the part that is given below.

        PART IDENT

        TASK/SUBTASK

        HP Compressor Front Cases

        1. Cracked at location 21

        1. Refer to Step.

        2. Cracked other than Step

        1. Reject

    2. SUBTASK 72-41-31-220-250 Examine the Stage 6 HP Compressor Front Cases Rotor Path Ring Slots at Location 21

    1. Refer to Figure.

      2. Scored/Scratched/Fretted.

        1. Not more than 0.005 in. (0.12 mm) in depth.

        1. Accept.

        2. Not more than 0.012 in. (0.305 mm) in depth over a localized arc of not more than 3.00 in. (76.20 mm) at no more than 3 locations in each half casing.

        1. Accept.

        3. In the limits given in Repair, VRS6634 TASK 72-41-31-300-028 (REPAIR-028)

        1. Repair, VRS6634 TASK 72-41-31-300-028 (REPAIR-028)

        4. In the limits given in Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001).

        1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001).

          NOTE

          The circumferential length of damage repairable using VRS6105 at the stage 6 rotor path groove bottom (location 21) is a cumulative limit for each half case.

        5. More than in Step, Step, Step or Step.

        1. Reject.

      3. Cracked.

        1. In the limits given in Repair VRS6661.

        1. Repair, VRS6661 TASK 72-41-31-300-029 (Repair-029).

        2. More than in Step.

        1. Reject

    3. SUBTASK 72-41-31-220-177 Examine the HP Compressor Front Cases VIGV Bush Location at Location 1

    1. Refer to Figure.

      2. Bore.

        1. Worn.

          1. If the inner bore is between 0.655 in. and 0.656 in. (16.64 mm and 16.67 mm)

          1. Accept

          2. More than 0.656 in. (16.67 mm)

          1. Reject

        2. Scored.

          1. Not more than 0.002 in. (0.05 mm) in depth

          1. Accept

          2. More than Step.

          1. Reject

    4. SUBTASK 72-41-31-220-178 Examine the HP Compressor Front Cases Stage 3 VSV Bush Location at Location 2

    1. Refer to Figure.

      2. Bore.

        1. Worn.

          1. If the inner bore is between 0.734 in. and 0.735 in. (18.64 mm and 18.67 mm)

          1. Accept

          2. More than 0.735 in. (18.67 mm)

          1. Reject

        2. Scored.

          1. Not more than 0.002 in. (0.05 mm) in depth

          1. Accept

          2. More than Step.

          1. Reject

    5. SUBTASK 72-41-31-220-179 Examine the HP Compressor Front Cases Stage 4 and 5 VSV Bush Location at Location 3

    1. Refer to Figure.

      2. Bore.

        1. Worn.

          1. If the inner bore is between 0.576 in. and 0.579 in. (14.64 mm and 14.70 mm).

          1. Accept

          2. More than 0.579 in. (14.70 mm).

          1. Reject

        2. Scored.

          1. Not more than 0.002 in. (0.05 mm) in depth

          1. Accept

          2. More than Step

          1. Reject

    6. SUBTASK 72-41-31-220-180 Examine the HP Compressor Front Cases Split Line Faces at Location 5

    1. Refer to Figure.

      2. Scored

      1. Reject

      3. Scratched/Galled.

        1. Not more than 0.002 in. (0.05 mm) in depth

        1. Accept

        2. More than Step.

        1. Reject

    7. SUBTASK 72-41-31-220-181 Examine the HP Compressor Front Cases Split Line Bolt Holes at Location 6

    1. Refer to Figure.

      2. Scored or with burred edges

      1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

      3. Worn.

        1. If the diameter is between 0.313 in. and 0.314 in. (7.95 mm and 7.97 mm).

        1. Accept.

        2. More than 0.314 in. (7.97 mm).

        1. Reject.

    8. SUBTASK 72-41-31-220-182 Examine the HP Compressor Front Cases Front and Rear Flanges at Location 7

    1. Refer to Figure.

      2. Scored/Scratched/Galled.

        1. Not more than 0.002 in. (0.05 mm) in depth

        1. Accept

        2. More than Step.

        1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

    9. SUBTASK 72-41-31-220-183 Examine the HP Compressor Front Cases Location Bolt Holes at Location 8

    1. Refer to Figure.

      2. Scored or with burred edges

      1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

      3. Worn.

        1. If the diameter is between 0.346 in. and 0.361 in. (8.80 mm and 9.16 mm).

        1. Accept.

        2. More than 0.361 in. (9.16 mm).

        1. Reject.

    10. SUBTASK 72-41-31-220-184 Examine the HP Compressor Front Cases Blank Access, Stage 3 and 5 Borescope Access at Locations 9, 10 and 15

    1. Refer to Figure.

      2. Scored/Scratched.

        1. Not more than 0.002 in. (0.05 mm) in depth

        1. Accept

        2. More than Step in bore.

        1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

        3. More than Step around inner surface edge.

        1. Repair, VRS6511 TASK 72-41-31-300-022 (REPAIR-022)

    11. SUBTASK 72-41-31-220-185 Examine the Stage 4 and 5 HP Compressor Front Cases Rotor Path Ring Slots at Location 12

    1. Refer to Figure.

      2. Scored/Scratched/Fretted

        NOTE

        Nominal Rotor Path Ring Slot is 0.1201 in. +/- 0.0010 in. (3.050 mm +/- 0.025 mm)

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

        1. Accept

        2. Not more than 0.0120 in. (0.305 mm) in depth over a localised arc of no more than 3.000 in. (76.20 mm) at no more than 3 locations in each half casing

        1. Accept

        3. More than Step or Step.

        1. Reject

    12. SUBTASK 72-41-31-220-239 Examine the HP Compressor Front Cases Rotor Path Ring Slot Faces at Location 22

    1. Refer to Figure.

      2. Scored, Scratched and frettage.

        1. Not more than 0.011 in. (0.28 mm) in depth.

        1. Accept.

        2. Not more than 0.040 in. (1.02 mm) in depth over a localised arc of not more than 0.650 in. (16.51 mm) at no more than 3 locations in each half casing

        1. Repair, VRS6517 TASK 72-41-31-300-030 (REPAIR-030).

        3. Not more than 0.080 in. (2.03 mm) in depth over a localised arc of not more than 0.650 in. (16.51 mm) at no more than 3 locations in each half casing

        1. Repair, VRS6661 TASK 72-41-31-300-029 (REPAIR-029)

        4. For 6th stage only: Within the limits given in Repair, VRS6634 TASK 72-41-31-300-028 (REPAIR-028).

        1. Repair, VRS6634 TASK 72-41-31-300-028 (REPAIR-028).

        5. More than Step or Step.

        1. Reject.

    13. SUBTASK 72-41-31-220-186 Examine the HP Compressor Front Cases VSV Location Recesses at the VIGV and Stages 3, 4 and 5 at Location 13

    1. Refer to Figure and Figure.

      2. VIGV and stages 3, 4 and 5 VSV location recess and adjacent wall area - Scored/Nicked/Worn.

        1. Not more than 0.002 in. (0.05 mm) in depth

        1. Accept

        2. Not more than 0.078 in. (1.98 mm) in depth radially from the bore

        1. Repair, VRS6511 TASK 72-41-31-300-022 (REPAIR-022)

        3. More than Step.

        1. Reject

    14. SUBTASK 72-41-31-220-187 Examine the HP Compressor Front Cases Screw Thread Inserts

      1. Examine the screw thread inserts at the support tool blank, stage 6 off- takes and the stage 3 and 5 borescope blank mounts.

        1. Broken, loose, worn, crossed or stripped thread

        1. Repair, VRS6345 TASK 72-41-31-300-011 (REPAIR-011)

      2. Examine the remaining screw thread inserts.

        1. Broken, loose, worn, crossed or slipped thread

        1. Repair, VRS6345 TASK 72-41-31-300-011 (REPAIR-011)

    15. SUBTASK 72-41-31-220-188 Examine the HP Compressor Front Cases VSV Towers at Location 14

    1. Refer to Figure.

      2. Nicked/Dented/Scored

      1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

    16. SUBTASK 72-41-31-220-189 Examine the HP Compressor Front Cases Surface Finish at Location 4

    1. Refer to Figure.

      2. Scored/Scratched

        1. Not more than 0.002 in. (0.05 mm) in depth

        1. Accept

        2. More than Step.

        1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

    17. SUBTASK 72-41-31-220-190 Examine the HP Compressor Front Cases Dowels

      1. Active clearance control actuator location dowels.

        1. Loose or with burred edges

        1. Repair, VRS6321 TASK 72-41-31-300-012 (REPAIR-012)

        2. Worn.

          1. If the diameter of the dowel is between 0.2367 in. and 0.237 in. (6.01 mm and 6.02 mm).

          1. Accept.

          2. Less than 0.2367 in. (6.01 mm).

          1. Repair, VRS6321 TASK 72-41-31-300-012 (REPAIR-012).

      2. Crankshaft location dowels.

        1. Loose or with burred edges

        1. Repair, VRS6321 TASK 72-41-31-300-012 (REPAIR-012)

      3. Larger dowels.

        1. Worn.

          1. If the diameter of the dowel is between 0.2367 in. and 0.2371 in. (6.012 mm and 6.024 mm).

          1. Accept

          2. Less than in 0.2367 in. (6.012 mm)

          1. Repair, VRS6321 TASK 72-41-31-300-012 (REPAIR-012)

      4. Small dowels.

        1. Worn.

          1. If the diameter of the dowel is between 0.1973 in. and 0.1978 in. (5.011 mm and 5.024 mm).

          1. Accept

          2. Less than 0.1973 in. (5.011 mm)

          1. Repair, VRS6321 TASK 72-41-31-300-012 (REPAIR-012)

    18. SUBTASK 72-41-31-220-191 Examine the HP Compressor Front Cases Dowel Holes at Locations 16, 17 and 18

    1. Refer to Figure.

      2. Burred edges.

      1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001).

      3. Scored/nicked/dented/gouged in the dowel pin holes and/or on hole edges extending onto the flange face.

        1. Location 16.

          1. Not more than 0.375 in. (9.53 mm) in circumferential length, 0.055 in. (1.40 mm) in axial width, and 0.032 in. (0.81 mm) in radial depth.

          1. Blend smooth to remove damage by Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001).

        2. Location 17.

          1. Not more than 0.225 in. (5.72 mm) in circumferential length, 0.055 in. (1.40 mm) in axial width, and 0.032 in. (0.81 mm) in radial depth.

          1. Remove raised material and burrs only by Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001).

        3. Location 18.

          1. Not more than 0.370 in. (9.40 mm) in circumferential length, 0.135 in. (3.43 mm) in axial width, and 0.032 in. (0.81 mm) in radial depth.

          1. Blend smooth to remove damage by Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001).

        4. More than Step and/or Step.

        1. Reject.

        5. More than Step.

        1. Repair, VRS9343 TASK 72-41-31-300-017 (REPAIR-017).

      4. Worn.

        1. Location 16.

          1. If the diameter is between 0.239 in. and 0.240 in. (6.07 mm and 6.10 mm)

          1. Accept

          2. More than 0.240 in. (6.10 mm)

          1. Reject

        2. Location 17.

          1. If the diameter is between 0.476 in. and 0.477 in. (12.09 mm and 12.11 mm).

          1. Accept

          2. More than 0.477 in. (12.11 mm)

          1. Reject

        3. Location 18.

          1. If the diameter is between 0.236 in. and 0.237 in. (5.99 mm and 6.02 mm)

          1. Accept

          2. More than 0.237 in. (6.02 mm)

          1. Repair, VRS9343 TASK 72-41-31-300-017 (REPAIR-017).

    19. SUBTASK 72-41-31-220-192 Examine the HP Compressor Front Cases Gas Washed Surfaces at Location 23 and Internal Surfaces at Location 11

    1. Refer to Figure.

      2. Scored/Scratched/Worn at location 11.

        1. Not more than 0.002 in. (0.05 mm) in depth

        1. Accept

        2. More than in Step

        1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

      3. Scored/Scratched/Nicked/Worn at location 23.

        1. Not more than 0.002 in. (0.05 mm) in depth

        1. Accept

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

        1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001)

        3. Not more than 0.050 in. (1.27 mm)

        1. Repair, VRS6511 TASK 72-41-31-300-022 (REPAIR-022)

        4. More than Step.

        1. Reject

    20. SUBTASK 72-41-31-220-193 Examine the Stage 3 Rotor Path Lining at Location 20

    1. Refer to Figure.

      2. Rotor path ring lining radius. Use the data written as a note in TASK 72-41-00-040-001. (DISASSEMBLY, CONFIG-001).

        1. If the radius is between 11.146 and 11.150 in. (283.11 and 283.21 mm)

        1. Accept

        2. More than 11.150 in. (283.21 mm)

        1. Repair, VRS6500 TASK 72-41-31-300-020 (REPAIR-020)

      3. Gouged

      1. Repair, VRS6500 TASK 72-41-31-300-020 (REPAIR-020).

      4. Chipped

        1. Not more than 0.100 in. (2.54 mm) in length and 0.050 in. (1.27 mm) in width at the split line if there is no loss of adhesion to the backing material

        1. Accept

        2. More than Step.

        1. Repair, VRS6500 TASK 72-41-31-300-020 (REPAIR-020).

      5. Scored.

        1. Not more than 0.010 in. (0.25 mm) in depth

        1. Accept

        2. More than Step.

        1. Repair, VRS6500 TASK 72-41-31-300-020 (REPAIR-020).

    21. SUBTASK 72-41-31-220-194 Examine the HP Compressor Front Cases Stage 6 and Stage 4 Segment Anti-Rotation Stop Pins at Location 19 and Location 24

    1. Refer to Figure.

      2. Damaged

      1. Repair, VRS6624 TASK 72-41-31-300-026 (REPAIR-026).

    22. SUBTASK 72-41-31-380-054 Reprotect the HP Compressor Front Cases at Location 4

    1. Refer to Figure.

      2. Apply dry film lubricant.

      1. Repair, VRS6501 TASK 72-41-31-300-021 (REPAIR-021).

    23. Figure: HP Compressor Front Cases - Inspection Locations

    Sheet 1

    Legend
    HP Compressor Front Cases - Inspection Locations

    Sheet 1

    Close

    Figure: HP Compressor Front Cases - Inspection Locations

    Sheet 2

    Legend
    HP Compressor Front Cases - Inspection Locations

    Sheet 2

    Close

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised subtask title and figure. (19VG123)