TASK 72-41-34-200-012-D00 HPC Stage 4 Unison Ring Connector Bridges - Examine, Inspection-012

DMC:V2500-A0-72-41-3434-00D-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 72-41-34-200-012-D00 HPC Stage 4 Unison Ring Connector Bridges - Examine, Inspection-012

Effectivity

FIG/ITEM PART NO.

04-200

6A7893

04-200

6A8079

04-200

6A8123

04-200

6B1081

04-201

6B1082

General

This TASK gives the procedure for the inspection of the stage 4 bridge piece assemblies and/or bridging pieces.

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 the 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 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 72-41-34-230-395 Examine the Stage 4 Bridge Piece Assemblies and/or Bridging Pieces ((72-41-34,04-200) and (72-41-34,04-201)) for Cracks

    1. Clean the parts. Refer to TASK 72-41-34-100-000.

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

        PART IDENT

        TASK/SUBTASK

        Stage 4 bridge piece assemblies and/or bridging pieces

        1. Cracked

        1. Reject

    2. SUBTASK 72-41-34-220-396 Examine the Stage 4 Bridge Piece Assemblies and/or Bridging Pieces ((72-41-34,04-200) and (72-41-34,04-201)) Bodies at Location 1

    1. Refer to Figure, Figure and Figure.

      2. Nicked.

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

        1. Accept

        2. More than in Step

        1. Repair, VRS6193 TASK 72-41-34-300-004 (REPAIR-004) or Repair, VRS6688 TASK 72-41-34-300-058 (REPAIR-058).

      3. Scored.

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

        1. Accept

        2. More than in Step

        1. Repair, VRS6193 TASK 72-41-34-300-004 (REPAIR-004) or Repair, VRS6688 TASK 72-41-34-300-058 (REPAIR-058).

      4. Scratched.

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

        1. Accept

        2. More than in Step

        1. Repair, VRS6193 TASK 72-41-34-300-004 (REPAIR-004) or Repair, VRS6688 TASK 72-41-34-300-058 (REPAIR-058).

    3. SUBTASK 72-41-34-220-397 Examine the Stage 4 Bridge Piece Assemblies (72-41-34, 04-200) and (72-41-34, 04-201) Spacers at Location 2 (Pre SBE 72-0564, SBE 72-0564)

    1. Refer to Fig. 72-41-34-900-242-001.

      2. Galled.

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

        1. Accept

        2. More than in Step

        1. Repair, VRS6193 TASK 72-41-34-300-004 (REPAIR-004) or Repair, VRS6688 TASK 72-41-34-300-058 (REPAIR-058).

      3. Scratched.

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

        1. Accept

        2. More than in Step

        1. Repair, VRS6193 TASK 72-41-34-300-004 (REPAIR-004) or Repair, VRS6688 TASK 72-41-34-300-058 (REPAIR-058).

      4. Welds cracked

      1. Reject

      5. Wear on the bore.

        1. Less than 0.2320 in. (5.905 mm) in diameter

        1. Accept

        2. More than in Step

        1. Reject

    4. SUBTASK 72-41-34-220-398 Examine the Stage 4 Bridge Piece Assemblies (72-41-34,04-200) Bushes at Location 3 (Pre SBE 72-0564)

    1. Refer to Figure.

      2. Inner bore scored.

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

        1. Accept.

        2. More than in Step.

        1. Repair, VRS6264 TASK 72-41-34-300-026 (REPAIR-026).

      3. If the bushes are missing.

      1. Repair, VRS6264 TASK 72-41-34-300-026 (REPAIR-026).

      4. Too much bush movement (side to side).

      1. Repair, VRS6264 TASK 72-41-34-300-026 (REPAIR-026).

      5. Wear.

        1. Less than 0.2010 in. (5.112 mm) in diameter.

        1. Accept.

        2. More than in Step.

        1. Repair, VRS6264 TASK 72-41-34-300-026 (REPAIR-026).

    5. SUBTASK 72-41-34-220-399 Examine the Stage 4 Bridge Piece Assemblies and/or Bridging Pieces ((72-41-34,04-200) and (72-41-34,04-201)) Bolt Holes at Location 4

    1. Refer to Figure, Figure and Figure.

      2. Scored.

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

        1. Accept

        2. More than in Step

        1. Reject

      3. Burred

      1. Reject

      4. Elongated

      1. Reject

    6. SUBTASK 72-41-34-220-400 Examine the Stage 4 Bridge Piece Assemblies (72-41-34,04-200) Dowels at Location 5 (Pre SBE 72-0564)

    1. Refer to Figure.

      2. Loose

      1. Reject

      3. Missing

      1. Reject

      4. Scored

      1. Reject

      5. Burred

      1. Reject

      6. Wear on inner diameter.

        1. Less than 0.439 in. (11.14 mm) in diameter

        1. Accept

        2. More than in Step

        1. Reject

    7. Figure: Stage 4 Bridge Piece Assembly - Inspection Locations

    Sheet 1

    Legend
    Stage 4 Bridge Piece Assembly - Inspection Locations

    Sheet 1

    Close

    Figure: Stage 4 Front Bridging Piece - Inspection Locations

    Sheet 2

    Legend
    Stage 4 Front Bridging Piece - Inspection Locations

    Sheet 2

    Close

    Figure: Stage 4 Rear Bridging Piece - Inspection Locations

    Sheet 3

    Legend
    Stage 4 Rear Bridging Piece - Inspection Locations

    Sheet 3

    Close

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedural steps to add repair reference and subtask title. (19VG308)