TASK 72-41-23-200-001-D00 HPC Rear Outer Case - Examine, lnspection-001

DMC:V2500-A5-72-41-2301-00D-300A-C|Issue No:004.00|Issue Date:2020-02-01

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-D00 HPC Rear Outer Case - Examine, lnspection-001

Effectivity

FIG/ITEM

PART NO.

02-400

6B1427

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 the service bulletin alpha variant refer to the IPC.

The policy that is necessary for inspection is given in 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 could be shown to be necessary at a subsequent date.

All parts must be examined to make sure that all the repairs are completed satisfactorily.

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:

Definitions 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:

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 72-41-23-230-250 Examine the Rear Outer Case for Cracks

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

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

      3. Do the test for cracks on the part that are given below.

        PART IDENT

        TASK/SUBTASK

        Rear outer case

        1. Cracked at rear flange Face 1.

        1. Refer to repair, VRS6530 TASK 72-41-23-300-024 (REPAIR-024).

        2. Cracked at all other locations.

        1. Reject.

    2. SUBTASK 72-41-23-220-201 Examine the Rear Outer Case Front and Rear Flanges at Face Locations 1 to 4

    1. Refer to Figure.

      2. Galled

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      3. Worn

        1. Not more than 0.002 in. (0.051 mm) in depth.

        1. Accept.

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      4. Scored.

        1. Not more than 0.002 in. (0.051 mm) in depth.

        1. Accept.

        2. More than in Step.

        1. Refer to 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. (0.051 mm) in depth

          1. Accept

          2. More than in Step with local damage not more than 0.008 in. (0.203 mm) in depth, separated by more than 1.772 in. (45.000 mm) between damage area centers.

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with general damage not more than 0.008 in. (0.203 mm) in depth separated by less than 1.772 in. (45.000 mm) between damage area centers.

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.008 in. (0.203 mm) in depth

          1. Reject

        2. Faces 2 and 3

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step and not more than 0.010 in (0.254 mm) in depth, with damage segregation not necessary.

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than 0.010 in. (0.254 mm) in depth

          1. Reject

    3. SUBTASK 72-41-23-220-202 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. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      3. Scratched

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      4. Chipped.

      1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      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. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      6. Cracked.

        1. If cracks are not found.

        1. Accept.

        2. If cracks are found.

        1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

    4. SUBTASK 72-41-23-220-203 Examine the Rear Outer Case Boltholes at Locations 6 to 9

    1. Refer to Figure.

      2. Burred edges

      1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      3. Scratched

      1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      4. Pitted and surface damaged

        1. Hole 6 - bore surface.

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step and not more than 0.027 in. (0.686 mm) in depth.

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          3. More than 0.027 in. (0.686 mm) in depth

          1. Reject

        2. Hole 7 - counter bore surface

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step and not more than 0.020 in. (0.508 mm) in depth

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          3. More than 0.020 in. (0.508 mm) in depth

          1. Reject

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

          1. Not more than 0.010 in. (0.254 mm) in depth

          1. Accept

          2. More than in Step.

          1. Reject

        4. Hole 7 - conical surfaces.

          1. Not more than 0.017 in. (0.432 mm) in depth

          1. Accept

          2. More than in Step.

          1. Reject

        5. Hole 8 - bore surface.

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step and not more than 0.020 in. (0.508 mm) in depth.

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          3. More than 0.020 in. (0.508 mm) in depth

          1. Reject

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

          1. Not more than 0.010 in. (0.254 mm) in depth

          1. Accept

          2. More than in Step.

          1. Reject

        7. Hole 9 - conical surfaces

          1. Not more than 0.017 in. (0.432 mm) in depth

          1. Accept

          2. More than in Step.

          1. Reject

    5. SUBTASK 72-41-23-220-204 Examine the Rear Outer Case 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. (1.040 mm) in depth in dowel hole axial direction

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

        2. More than in Step.

        1. Reject

      3. Location 10 - dowel hole diameter

        1. If the diameter is between 0.239 in. and 0.240 in. (6.070 mm and 6.100 mm)

        1. Accept

        2. More than in Step.

        1. Reject

      4. Location 11 - dowel hole diameter

        1. If the diameter is between 0.275 in. and 0.276 in. (6.985 mm and 7.010 mm)

        1. Accept

        2. More than in Step.

        1. Reject

      5. Pitted and surface damaged.

        1. Not more than 0.005 in. (0.127 mm) in depth

        1. Accept

        2. More than in Step.

        1. Reject

    6. SUBTASK 72-41-23-220-206 Examine the Rear Outer Case Bleed Ports at Locations 12 to 16 and Cooling Air Ports at Locations 17 to 21

    1. Refer to Figure.

      2. Galled surfaces

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      3. Scored surfaces

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      4. Pitted surfaces

        1. External boss surfaces

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step with local pitting not more than 0.030 in. (0.762 mm) in depth, separated by more than 1.772 in. (45.000 mm) between damage area centers.

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with general pitting not more than 0.030 in. (0.762 mm) in depth, separated by less than 1.772 in. (45.000 mm) between damage area centers.

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.030 in. (0.762 mm) in depth

          1. Reject

        2. Internal casing surface local to fastener holes.

          1. Not more than 0.005 in. (0.127 mm) in depth and in radius 0.394 in. (10.000 mm) of hole center.

          1. Accept

          2. More than in Step and not more than 0.012 in. (0.305 mm) in depth and in radius 0.236 in. (6.000 mm) of hole center.

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than 0.012 in. (0.305 mm) in depth or pitting outside permitted repair zones, as in Step and Step.

          1. Reject

      5. Burred edges

      1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

    7. SUBTASK 72-41-23-220-208 Examine the Rear Outer Case Stage 7 to 11 Borescope Holes at Locations 22 and 23

    1. Refer to Figure.

      2. Scored

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      3. Galled

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step

        1. Refer to 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. (0.127 mm) in depth

          1. Accept

          2. More than in Step with local pitting not more than 0.030 in. (0.762 mm) in depth, separated by more than 1.772 in. (45.000 mm) between damage area centers.

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with general pitting not more than 0.030 in. (0.762 mm) in depth, separated by less than 1.772 in. (45.000 mm) between damage area centers.

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.030 in. (0.762 mm) in depth

          1. Reject

        2. Internal casing surface local to fastener holes

          1. Not more than 0.005 in. (0.127 mm) in depth and in radius 0.394 in. (10.000 mm) of hole centre

          1. Accept

          2. More than in Step and not more than 0.012 in. (0.305 mm) in depth and in radius 0.236 in. (6.000 mm) of hole centre

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than 0.012 in. (0.305 mm) in depth or pitting outside permitted repair zones, as in Step and Step.

          1. Reject

        3. Borescope bores

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step.

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

      5. Burred edges

      1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

    8. SUBTASK 72-41-23-220-209 Examine the Rear Outer Case Shank Nuts at Locations 24 and 25

    1. Refer to Figure.

      2. Loose

      1. Refer to REPAIR-011 (VRS6279) TASK 72-41-23-300-011.

      3. Damaged

      1. Refer to REPAIR-011 (VRS6279) TASK 72-41-23-300-011.

    9. SUBTASK 72-41-23-220-210 Examine the Rear Outer Case Pins at Location 26

    1. Refer to Figure.

      2. Burred

      1. Refer to REPAIR-021 (VRS6278) TASK 72-41-23-300-021.

      3. Scored

      1. Refer to REPAIR-021 (VRS6278) TASK 72-41-23-300-021.

      4. Loose

      1. Refer to REPAIR-021 (VRS6278) TASK 72-41-23-300-021.

    10. SUBTASK 72-41-23-220-211 Examine the Rear Outer Case Screw Thread Inserts

      1. Broken

      1. Refer to REPAIR-019 (VRS6306) TASK 72-41-23-300-019.

      2. Loose

      1. Refer to REPAIR-019 (VRS6306) TASK 72-41-23-300-019.

      3. Worn

      1. Refer to REPAIR-019 (VRS6306) TASK 72-41-23-300-019.

      4. Crossed thread

      1. Refer to REPAIR-019 (VRS6306) TASK 72-41-23-300-019.

      5. Stripped thread

      1. Refer to REPAIR-019 (VRS6306) TASK 72-41-23-300-019.

    11. SUBTASK 72-41-23-220-212 Examine the Rear Outer Case Screw Thread Insert Holes

      1. Worn.

      1. Refer to REPAIR-022 (VRS6526) TASK 72-41-23-300-022.

      2. Missing threads or serrations

      1. Refer to REPAIR-022 (VRS6526) TASK 72-41-23-300-022.

      3. Damaged

      1. Refer to REPAIR-022 (VRS6526) TASK 72-41-23-300-022.

      4. Damaged due to oversized inserts.

      1. Repair, VRS6540 72-41-23-300-026 (REPAIR-026).

      5. Inspect for KEENSERTS.

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

    12. SUBTASK 72-41-23-220-213 Examine the Rear Outer Case Surface Protection

      1. Damaged

      1. Refer to REPAIR-003 (VRS6178) TASK 72-41-23-300-003.

    13. SUBTASK 72-41-23-220-214 Examine the Rear Outer Case Face at Location 1117

    1. Refer to Figure.

      2. Scored

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      3. Worn

        1. If the diameter is between 23.1482 in. and 23.1522 in. (587.965 mm and 588.065 mm).

        1. Accept.

        2. More than in Step.

        1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      4. Chipped.

      1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      5. Scratched

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

      6. Cracked.

        1. If cracks are not found.

        1. Accept.

        2. If cracks are found.

        1. Refer to repair, VRS6538 TASK 72-41-23-300-025 (REPAIR-025).

    14. SUBTASK 72-41-23-220-215 Examine the Rear Outer Case Face at Location 27

    1. Refer to Figure.

      2. Scored

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      3. Galled

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

      4. Pitted and Surface damaged

        1. Not more than 0.002 in. (0.051 mm) in depth for an arc length of 1.968 in. (50.000 mm) in 7.874 in. (200.000 mm) circumferential length

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

        2. More than in Step.

        1. Reject

      5. Worn

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

        1. Accept

        2. More than in Step.

        1. Refer to REPAIR-013 (VRS6339) TASK 72-41-23-300-013.

    15. SUBTASK 72-41-23-220-216 Examine the Rear Outer Case 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. (0.127 mm) in depth

          1. Accept

          2. More than in Step with local pitting not more than 0.013 in. (0.330 mm) in depth, separated by more than 1.772 in. (45.000 mm) between damage area centers and not in the damage exclusion zone diameter 0.610 in. (15.500 mm) centered on fastener hole

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with general pitting not more than 0.016 in. (0.406 mm) in depth or pitting in the exclusion zone

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.016 in. (0.406 mm) in depth

          1. Reject

        2. Face 34.

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step with local pitting not more than 0.013 in. (0.330 mm) in depth, separated by more than 1.772 in. (45.000 mm) between damage area centers and not in the damage exclusion zone diameter 0.610 in. (15.500 mm) centered on fastener hole

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with general pitting not more than 0.020 in. (0.508 mm) in depth or pitting in the exclusion zone

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.020 in. (0.508 mm) in depth

          1. Reject

    16. SUBTASK 72-41-23-220-217 Examine the Rear Outer Case 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. Face 30 (recess diameter)

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step with local pitting not more than 0.012 in. (0.305 mm) in depth, separated by more than 1.772 in. (45.000 mm) between damage area centers and not in the damage exclusion zone diameter 0.630 in. (16.000 mm) centered on fastener hole

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with general pitting not more than 0.024 in. (0.610 mm) in depth

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.024 in. (0.610 mm) in depth

          1. Reject

        2. Face 31 (rear face)

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step with local pitting not more than 0.010 in. (0.254 mm) in depth

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with heavy pitting not more than 0.017 in. (0.432 mm) in depth or pitting in the exclusion zone

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.017 in. (0.432 mm) in depth

          1. Reject

        3. Face 32 (inner diameter)

          1. Not more than 0.005 in. (0.127 mm) in depth

          1. Accept

          2. More than in Step with light pitting not more than 0.030 in. (0.762 mm) in depth

          1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

          3. More than in Step with heavy pitting not more than 0.045 in. (1.143 mm) in depth

          1. Refer to repair, VRS6528 TASK 72-41-23-300-023 (REPAIR-023).

          4. More than 0.045 in. (1.143 mm) in depth

          1. Reject

    17. SUBTASK 72-41-23-220-218 Examine the Rear Outer Case all Remaining Machined Surfaces

      1. Nicked, dented and scratched.

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

    18. SUBTASK 72-41-23-220-219 Examine the Rear Outer Case all Remaining Cast Surfaces

      1. Nicked, dented and scratched.

        1. Not more than 0.002 in. (0.051 mm) in depth

        1. Accept

        2. More than in Step.

        1. Refer to repair, VRS6104 TASK 72-41-23-300-001 (REPAIR-001).

    19. SUBTASK 72-41-23-220-220 Replace Surface Protection and Shank Nuts

      1. Apply surface protection

      1. Refer to REPAIR-003 (VRS6178) TASK 72-41-23-300-003.

      2. Replace shank nuts

      1. Refer to REPAIR-011 (VRS6279) TASK 72-41-23-300-011.

    20. Figure: Rear Outer Case - Inspection Locations

    Rear Outer Case - Inspection Locations

    Rear Outer Case - Inspection Locations

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised inspection criteria. (19VG096)