TASK 72-41-31-200-002-A00 HPC Front Cases - Examine, Inspection-002

DMC:V2500-A0-72-41-3101-00A-300A-C|Issue No:003.00|Issue Date:2016-11-01

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 72-41-31-200-002-A00 HPC Front Cases - Examine, Inspection-002

Effectivity

FIG/ITEM

PART NO.

01-400

6A3462

01-400

6A3675

General

This TASK gives the procedure for the inspection of the HP Compressor Front Cases.

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 the 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 72-41-31-230-052 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

        SPM TASK 70-23-02-230-501

        1. Cracked other than those defined in Step

        1. Reject

    2. SUBTASK 72-41-31-220-056 Examine the HP Compressor Front Cases VIGV Bush Location at Location 1

    1. Refer to Figure.

      2. Wear on the bore.

        1. If the inner bore is between 0.630 in. and 0.631 in. (16.00 mm and 16.03 mm).

        1. Accept

        2. More than Step.

        1. Reject

      3. Scored on the bore.

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

        1. Accept

        2. More than Step.

        1. Reject

    3. SUBTASK 72-41-31-220-057 Examine the HP Compressor Front Cases Stage 3 VSV Bush Location at Location 2

    1. Refer to Figure.

      2. Wear on bore.

        1. If the inner bore is between 0.709 in. and 0.710 in. (18.00 mm and 18.03 mm).

        1. Accept

        2. More than Step.

        1. Reject

      3. Scored on the bore.

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

        1. Accept

        2. More than Step.

        1. Reject

    4. SUBTASK 72-41-31-220-058 Examine the HP Compressor Front Cases Stage 4, 5 and 6 VSV Bush Location at Location 3

    1. Refer to Figure.

      2. Stages 4, 5 wear on bore.

        1. If the inner bore is between 0.551 in. and 0.552 in. (14.00 mm and 14.03 mm).

        1. Accept

        2. More than Step.

        1. Reject

      3. Stages 4,5 scored on the bore.

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

        1. Accept

        2. More than Step.

        1. Reject

      4. Stage 6 wear on bore.

        1. If the inner bore is between 0.473 in. and 0.474 in. (12.00 mm and 12.03 mm).

        1. Accept

        2. More than Step.

        1. Repair, VRS6618 TASK 72-41-31-300-024 (REPAIR-024)

      5. Stage 6 scored on the bore.

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

        1. Accept

        2. More than Step.

        1. Repair, VRS6618 TASK 72-41-31-300-024 (REPAIR-024)

    5. SUBTASK 72-41-31-220-060 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.

    6. SUBTASK 72-41-31-220-061 Examine the HP Compressor Front Cases Split Line Bolt Holes at Location 6

    1. Refer to Figure.

      2. Burred edges/Scored

      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 Step.

        1. Reject.

    7. SUBTASK 72-41-31-220-062 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)

    8. SUBTASK 72-41-31-220-063 Examine the HP Compressor Front Cases Location Bolt Holes at Location 8

    1. Refer to Figure.

      2. Burred edges/Scored

      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 Step.

        1. Reject.

    9. SUBTASK 72-41-31-220-064 Examine the HP Compressor Front Cases Blank Access, Stage 3 and 5 Borescope Access at Locations 9, 10 and 15

    1. Refer to Figure and 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)

        3. More than Step but on the gas washed surface.

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

      3. Cracked.

        1. Localised cracks through the side wall of the borescope access ports in the axial plane.

        1. Accept

        2. Other than in Step.

        1. Reject

    10. SUBTASK 72-41-31-220-066 Examine the 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. (0.12 mm) in depth

        1. Accept

        2. Not more than to 0.0120 in. (0.305 mm) in depth over a localised arc of not more than 3.000 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. More than Step, Step or Step.

        1. Reject

    11. SUBTASK 72-41-31-220-237 Examine the HP Compressor Front Cases Rotor Path Ring Slot Faces at Face 18

    1. Refer to Figure.

      2. Scored, Scratched or 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. Within the repair limits given in VRS6634

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

        5. More than Step or Step.

        1. Reject

    12. SUBTASK 72-41-31-220-067 Examine the HP Compressor Front Cases VSV Location Recesses at Stages 3, 4, 5 and 6 at Location 13

    1. Refer to Figure and Figure.

      2. Stages 3, 4, 5, 6 and adjacent wall area - Scored/Nicked.

        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

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

        3. More than Step.

        1. Reject

    13. SUBTASK 72-41-31-220-068 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

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

        2. Loose

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

        3. Worn

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

        4. Crossed thread

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

        5. Stripped thread

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

      2. Examine the remaining screw thread inserts.

        1. Broken

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

        2. Loose

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

        3. Worn

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

        4. Crossed threads

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

        5. Stripped thread

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

    14. SUBTASK 72-41-31-220-069 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)

    15. SUBTASK 72-41-31-220-070 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) and Repair, VRS6501 TASK 72-41-31-300-021 (REPAIR-021)

    16. SUBTASK 72-41-31-220-114 Examine the HP Compressor Front Cases Dowels

      1. Active clearance control actuator location dowels.

        1. Loose

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

        2. Burred edges

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

        3. Wear.

          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 Step.

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

      2. Crankshaft location dowels.

        1. Loose

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

        2. Burred edges

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

        3. Wear on the larger dowels.

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

          1. Accept

          2. Less than Step.

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

        4. Wear on the small dowels.

          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 Step.

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

    17. SUBTASK 72-41-31-220-115 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. Nicked/Dented/Gouged/Scored.

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

        1. Repair, VRS6105 TASK 72-41-31-300-001 (REPAIR-001) (Remove high spots and burrs only)

        2. More than Step.

        1. Reject.

      4. Wear at 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 Step.

        1. Reject.

      5. Wear at location 17.

        1. If the diameter is between 0.476 in. and 0.477 in. (12.08 mm and 12.12 mm).

        1. Accept.

        2. More than Step.

        1. Reject.

      6. Wear at 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 Step.

        1. Reject.

    18. SUBTASK 72-41-31-220-143 Examine the HP Compressor Front Cases, Gas Washed Surfaces at Location 22 and Internal Surfaces at Location 11

    1. Refer to Figure.

      2. Scored/Scratched at location 11.

        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)

      3. Scored/Scratched/Nicked/Worn at location 22.

        1. Note more than 0.002 in. (0.05 mm) in depth

        1. Accept

        2. Not more than 0.005 in. (0.127 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 0.050 in. (1.27 mm) and not more than 0.125 in. (3.17 mm) at the stage 6 VSV location

        1. Repair, VRS6629 TASK 72-41-31-300-027 (REPAIR-027)

        5. More than Step.

        1. Reject

    19. SUBTASK 72-41-31-380-056 Reprotect the HP Compressor Front Case at Location 4

    1. Refer to Figure.

      2. Apply dry film lubricant.

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

    20. 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

    Figure: HP Compressor Front Cases - Cracking at Location of Borescope Hole

    HP Compressor Front Cases - Cracking at Location of Borescope Hole

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedure to introduce inspection criteria for the nick/dent/gouge on the dowel holes at location 16, 17 and 18. (14VR690)