TASK 72-41-23-200-001-A00 HPC Rear Outer Case - Examine, Inspection-001

DMC:V2500-A0-72-41-2301-00A-300A-C|Issue No:003.00|Issue Date:2021-02-01

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 72-41-23-200-001-A00 HPC Rear Outer Case - Examine, Inspection-001

Effectivity

FIG/ITEM PART NO.

02-400

6A2949

General

This TASK gives the procedure for the inspection of the rear outer case.

Fig/item numbers in parentheses in the procedure agree with those used in the IPC. Only the primary fig/item numbers are used. For service bulletin 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 the 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 satisfactory.

The practices and processes referred to in the procedure by the TASK/SUBTASK numbers are in SPM.

References

Refer to SPM for data on these items:

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

Record and Control of the Lives of Parts, SPM TASK 70-05-00-220-501,

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

Some data on these items are contained in this TASK. For more data on these items refer to 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 72-41-23-230-054 Examine the Rear Outer Case (72-41-23,02-400) for Cracks

    1. Refer to Figure.

    2. Remove shank nuts. Refer to Repair VRS6279, TASK 72-41-23-300-011 (REPAIR-011).

    3. Clean the parts. Refer to TASK 72-41-23-100-000 (CLEANING-000).

      4. Do the test for cracks on the parts that is given below.

        PART IDENT TASK/SUBTASK

        Rear outer case

        SPM TASK

        TASK 70-23-02-230-501

        1. Cracked at rear flange face 1

        1. Repair VRS6530, TASK 72-41-23-300-024 (REPAIR-024)

        2. Cracked at all other locations

        1. Reject

    2. SUBTASK 72-41-23-220-067 Examine the Rear Outer Case (72-41-23,02-400) Front and Rear Flanges at Face Locations 1 to 4

    1. Refer to Figure.

      2. Galled.

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

        1. Accept.

        2. More than in Step.

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      3. Worn.

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

        1. Accept.

        2. More than in Step.

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001).

      4. Scored.

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

        1. Accept.

        2. More than in Step.

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001).

      5. Pitted and surface damaged.

        1. Faces 1 and 4.

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

          1. Accept.

          2. More than in Step with local damage not more than 0.008 in. (0.20 mm) in depth, separated by more than 1.772 in. (45.00 mm) between damage area centres.

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with general damage not more than 0.008 in. (0.20 mm) in depth separated by less than 1.772 in. (45.00 mm) between damage area centres.

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.008 in. (0.20 mm) in depth.

          1. Reject.

        2. Faces 2 and 3.

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

          1. Accept.

          2. More than in Step and not more than 0.010 in. (0.25 mm) in depth, with damage segregation not necessary.

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001).

          3. More than 0.010 in. (0.25 mm) in depth.

          1. Reject.

    3. SUBTASK 72-41-23-220-068 Examine the Rear Outer Case (72-41-23,02-400) Coated Face at Location 5

    1. Refer to Figure.

      2. Scored.

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

        1. Accept.

        2. More than in Step.

        1. Repair VRS6179, TASK 72-41-23-300-002 (REPAIR-002).

      3. Scratched.

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

        1. Accept.

        2. More than in Step.

        1. Repair VRS6179, TASK 72-41-23-300-002 (REPAIR-002).

      4. Chipped.

      1. Repair VRS6179, TASK 72-41-23-300-002 (REPAIR-002).

      5. Worn.

        1. If the diameter is between 23.2270 in. and 23.2309 in. (589.9651 mm and 590.0651 mm).

        1. Accept.

        2. More than in Step.

        1. Repair VRS6179, TASK 72-41-23-300-002 (REPAIR-002).

      6. Cracked.

        1. If cracks not found.

        1. Accept.

        2. If cracks found.

        1. Repair VRS6179, TASK 72-41-23-300-002 (REPAIR-002).

    4. SUBTASK 72-41-23-220-069 Examine the Rear Outer Case (72-41-23,02-400) Bolt Holes at Locations 6 to 9

    1. Refer to Figure.

      2. Burred edges.

      1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001).

      3. Scratched.

      1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001).

        2. Pitted and surface damaged.

          1. Hole 6 - bore surface.

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

            1. Accept.

            2. More than in (a) and not more than 0.027 in. (0.68 mm) in depth.

            1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023).

            3. More than in (b).

            1. Reject.

          2. Hole 7 - shank nut neck bore (diameter 0.336 in. (8.54 mm) nominal).

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

            1. Accept.

            2. More than in (a)

            1. Reject.

          3. Hole 7 - conical surfaces.

            1. Not more than 0.017 in. (0.43 mm) in depth.

            1. Accept.

            2. More than in (a).

            1. Reject.

          4. Hole 7 - counter bore.

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

            1. Accept.

            2. More than in (a) and not more than 0.020 in. (0.50 mm) in depth.

            1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023).

            3. More than in (b).

            1. Reject.

          5. Hole 8 - bore surface.

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

            1. Accept.

            2. More than in (a) and not more than 0.020 in. (0.50 mm) in depth.

            1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023).

            3. More than in (b).

            1. Reject.

          6. Hole 9 - shank nut neck bore (diameter 0.336 in. (8.54 mm) nominal).

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

            1. Accept.

            2. More than in (a).

            1. Reject.

          7. Hole 9 - conical surfaces.

            1. Not more than 0.017 in. (0.43 mm) in depth.

            1. Accept.

            2. More than in (a).

            1. Reject.

    5. SUBTASK 72-41-23-220-070 Examine the Rear Outer Case (72-41-23,02-400) Dowel Holes at Locations 10 and 11

    1. Refer to Figure.

      2. Burred and/or raised edges.

        1. From impact damage not more than 0.041 in. (1.04 mm) in depth in dowel hole axial direction

        1. Repair VRS6104, TASK 70-41-23-300-001 (REPAIR-001)

        2. More than in (1)

        1. Reject

      3. Location 10 - dowel hole diameter.

        1. If the diameter is between 0.263 and 0.272 in. (6.70 and 6.90 mm)

        1. Accept

        2. If the diameter is more than in (1)

        1. Reject

      4. Location 11 - dowel hole diameter.

        1. If the diameter is between 0.275 and 0.276 in. (7.00 and 7.02 mm)

        1. Accept

        2. More than in (1)

        1. Reject

      5. Pitted and surface damaged.

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

        1. Accept

        2. More than in (1)

        1. Reject

    6. SUBTASK 72-41-23-220-071 Examine the Rear Outer Case (72-41-23,02-400) Bleed Ports at Locations 12 to 17 and Cooling Air Ports at Locations 18 to 22

    1. Refer to Figure.

      2. Galled surfaces.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      3. Scored surfaces.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      4. Pitted surfaces.

        1. External boss surfaces.

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

          1. Accept

          2. More than in (a) with local pitting not more than 0.030 in. (0.75 mm) in depth, separated by more than 1.772 in. (45.00 mm) between damage area centres

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than in (a) with general pitting not more than 0.030 in. (0.75 mm) in depth, separated by less than 1.772 in. (45.00 mm) between damage area centres

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          4. More than 0.030 in. (0.75 mm) in depth

          1. Reject

        2. Internal casing surface local to fastener holes.

          1. Not more than 0.005 in. (0.13 mm) in depth in radius 0.394 in. (10.00 mm) of hole centre

          1. Accept

          2. More than in (a) and not more than 0.012 in. (0.30 mm) in depth and in radius 0.236 in. (6.00 mm) of hole centre

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than 0.012 in. (0.30 mm) in depth or pitting outside permitted repair zones, as in (a) and (b)

          1. Reject

      5. Burred edges

      1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

    7. SUBTASK 72-41-23-220-073 Examine the Rear Outer Case (72-41-23,02-400) Stages 7 to 11 Borescope Holes at Locations 23 and 24

    1. Refer to Figure.

      2. Scored.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      3. Galled.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      4. Pitted and surface damaged.

        1. External boss surfaces.

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

          1. Accept

          2. More than in (a) with local pitting not more than 0.030 in. (0.75 mm) in depth, separated by more than 1.772 in. (45.00 mm) between damage area centres

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than in (a) with general pitting not more than 0.030 in. (0.75 mm) in depth, separated by less than 1.772 in. (45.00 mm) between damage area centres

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          4. More than 0.030 in. (0.75 mm) in depth

          1. Reject

        2. Internal casing surface local to fastener holes.

          1. Not more than 0.005 in. (0.13 mm) in depth in radius 0.394 in. (10.00 mm) of hole centre

          1. Accept

          2. More than in (a) and not more than 0.012 in. (0.30 mm) in depth and in radius 0.236 in. (6.00 mm) of hole centre

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than 0.012 in. (0.30 mm) in depth or pitting outside permitted repair zones, as in (a) and (b)

          1. Reject

        3. Borescope bores.

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

          1. Accept

          2. More than in (a) and not more than 0.024 in. (0.60 mm) in depth

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          3. More than 0.024 in. (0.60 mm) in depth

          1. Reject

      5. Burred edges

      1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

    8. SUBTASK 72-41-23-220-074 Examine the Rear Outer Case (72-41-23,02-400) Shank Nuts at Locations 25 and 26

    1. Refer to Figure.

      2. Loose

      1. Repair VRS6279, TASK 72-41-23-300-011 (REPAIR-011)

      3. Damaged

      1. Repair VRS6279, TASK 72-41-23-300-011 (REPAIR-011)

    9. SUBTASK 72-41-23-220-075 Examine the Rear Outer Case (72-41-23,02-400) Pins at Location 27

    1. Refer to Figure.

      2. Burred.

      1. Repair VRS6278, TASK 72-41-23-300-021 (REPAIR-021)

      3. Scored.

      1. Repair VRS6278, TASK 72-41-23-300-021 (REPAIR-021)

      4. Loose.

      1. Repair VRS6278, TASK 72-41-23-300-021 (REPAIR-021)

    10. SUBTASK 72-41-23-220-076 Examine the Rear Outer Case (02-400) Screw Thread Inserts

      1. Broken.

      1. Repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

      2. Loose.

      1. Repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

      3. Worn.

      1. Repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

      4. Crossed thread.

      1. Repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

      5. Stripped thread.

      1. Repair, VRS6306 TASK 72-41-23-300-019 (REPAIR-019).

      6. Inspect for KEENSERTS (for PNs 6A4154 and 6A5495).

      1. Repair, VRS6526 TASK 72-41-23-300-022 (REPAIR-022).

    11. SUBTASK 72-41-23-220-174 Examine the Rear Outer Case Screw Thread Insert Holes

      1. Worn

      1. Repair, VRS6526 TASK 72-41-23-300-022 (REPAIR-022).

      2. Missing threads/serrations.

      1. Repair, VRS6526 TASK 72-41-23-300-022 (REPAIR-022).

      3. Damaged.

      1. Repair, VRS6526 TASK 72-41-23-300-022 (REPAIR-022).

    12. SUBTASK 72-41-23-220-077 Examine the Rear Outer Case (02-400) Surface Protection

      1. Damaged

      1. Repair, VRS6178, TASK 72-41-23-300-003 (REPAIR-003)

    13. SUBTASK 72-41-23-220-081 Examine the Rear Outer Case (72-41-23,02-400) Face at Location 1118

    1. Refer to Figure.

      2. Scored.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      3. Galled.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      4. Worn.

        1. If the diameter is between 23.6221 and 23.6280 in. (600.000 and 600.150 mm)

        1. Accept

        2. More than in (1)

        1. Reject

    14. SUBTASK 72-41-23-220-084 Examine the Rear Outer Case (72-41-23,02-400) Face at Location 28

    1. Refer to Figure.

      2. Scored.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      3. Galled.

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

        1. Accept

        2. More than in (1)

        1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      4. Pitted and Surface damaged

      5. Not more than 0.002 in. (0.05 mm) in depth for an arc length of 1.968 in. (50.00 mm) in 7.874 in. (200.00 mm) circumferential length

      1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

      6. More than in (1)

      1. Reject

      7. Worn.

        1. If the diameter is between 25.1969 and 25.2017 in. (640.000 and 640.125 mm)

        1. Accept

        2. More than in (1)

        1. Repair VRS6339, TASK 72-41-23-300-013 (REPAIR-013)

    15. SUBTASK 72-41-23-220-192 Examine the Rear Outer Case (72-41-23,02-400) Front Flange Rear Face and Rear Flange Front Face at Locations 33 and 34

    1. Refer to Figure.

      2. Pitted and surface damaged.

        1. Face 33.

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

          1. Accept

          2. More than in (a) with local pitting not more than 0.013 in. (0.33 mm) in depth, separated by more than 1.772 in. (45.00 mm) between damage area centres and not in the damage exclusion zone diameter 0.610 in. (15.50 mm) centred on fastener hole

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than in (a) with general pitting not more than 0.016 in. (0.40 mm) in depth or pitting in the exclusion zone

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          4. More than 0.016 in. (0.40 mm) in depth

          1. Reject

        2. Face 34.

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

          1. Accept

          2. More than in (a) with local pitting not more than 0.013 in. (0.33 mm) in depth, separated by more than 1.772 in. (45.00 mm) between damage area centres and not in the damage exclusion zone diameter 0.610 in. (15.50 mm) centred on fastener hole

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than in (a) with general pitting not more than 0.020 in. (0.50 mm) in depth or pitting in the exclusion zone

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          4. More than 0.020 in. (0.50 mm) in depth

          1. Reject

    16. SUBTASK 72-41-23-220-193 Examine the Rear Outer Case (72-41-23,02-400) Front inner Flange Recess Diameter, Rear Face and Internal Diameter at Locations 30, 31 and 32

    1. Refer to Figure.

      2. Pitted and surface damaged.

        1. Location 30 (recess diameter).

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

          1. Accept

          2. More than in (a) with local pitting not more than 0.012 in. (0.30 mm) in depth, separated by more than 1.772 in. (45.00 mm) between damage area centres and not in the damage exclusion zone diameter 0.630 in. (16.00 mm) centred on fastener hole

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than in (a) with general pitting not more than 0.024 in. (0.60 mm) in depth

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          4. More than 0.024 in. (0.60 mm) in depth

          1. Reject

        2. Face 31 (rear face).

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

          1. Accept

          2. More than in (a) with local pitting more than in B.(1) and not more than 0.009 in. (0.25 mm) in depth

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than in (a) with heavy pitting more than in B.(1) and not more than 0.017 in. (0.43 mm) in depth or pitting in the exclusion zone

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          4. More than 0.017 in. (0.43 mm) in depth

          1. Reject

        3. Location 32 (inner diameter).

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

          1. Accept

          2. More than in (a) with light pitting more than in B.(1) and not more than 0.030 in. (0.75 mm) in depth

          1. Repair VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

          3. More than in (a) with heavy pitting more than in B.(1) and not more than 0.045 in. (1.15 mm) in depth

          1. Repair VRS6528, TASK 72-41-23-300-023 (REPAIR-023)

          4. More than 0.045 in. (1.15 mm) in depth

          1. Reject

    17. SUBTASK 72-41-23-220-085 Examine the Rear Outer Case (02-400) all Remaining Machined Surfaces

      1. Nicked, dented and scratched.

        1. Up to 0.002 in. (0.05 mm) in depth

        1. Accept

        2. More than in step A.(1)

        1. Repair, VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

    18. SUBTASK 72-41-23-220-086 Examine the Rear Outer Case (02-400) all Remaining Cast Surfaces

      1. Nicked, dented and scratched.

        1. Up to 0.002 in. (0.05 mm) in depth

        1. Accept

        2. More than in step A.(1)

        1. Repair, VRS6104, TASK 72-41-23-300-001 (REPAIR-001)

    19. SUBTASK 72-41-23-350-120 Replace Surface Protection and Shank Nuts

      1. Apply surface protection

      1. Repair VRS6178, TASK 72-41-23-300-003 (REPAIR-003)

      2. Replace shank nuts

      1. Repair VRS6279, TASK 72-41-23-300-011 (REPAIR-011)

    20. Figure: Rear Outer Case - Inspection Locations

    Sheet 1

    Legend
    Rear Outer Case - Inspection Locations

    Sheet 1

    Close

    Figure: Rear Outer Case - Inspection Locations

    Sheet 2

    Legend
    Rear Outer Case - Inspection Locations

    Sheet 2

    Close

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Corrected the wear limits. (20VG157)