TASK 72-41-34-200-008-C00 HPC Stage 5 Unison Rings - Examine, Inspection-008 - SBE 72-0418

DMC:V2500-A0-72-41-3425-00C-300A-C|Issue No:002.00|Issue Date:2016-08-01

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 72-41-34-200-008-C00 HPC Stage 5 Unison Rings - Examine, Inspection-008 - SBE 72-0418

Effectivity

FIG/ITEM PART NO.

05-440

6A7894

05-440

6A8088

05-540

6A7896

General

This TASK gives the procedure for the inspection of the stage 5 upper and lower unison rings.

Fig/item numbers in parentheses in the procedure agree with those used in the EIPC. Only the primary Fig/item numbers are used. For the service bulletin alpha variant refer to the EIPC.

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:

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 72-41-34-230-001 Examine the Stage 5 Upper and Lower Unison Rings for Cracks

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

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

        PART IDENT

        TASK/SUBTASK

        Stage 5 upper and lower unison rings.

        1. Cracked.

        1. Reject.

    2. SUBTASK 72-41-34-220-405 Examine the Stage 5 Upper and Lower Unison Rings Bodies at Locations 1 and 2

    1. Refer to Figure.

      2. Nicked.

        1. Up to 0.005 in. (0.13 mm) in depth.

        1. Accept.

        2. More than in Step.

        1. Repair, VRS6195 TASK 72-41-34-300-009 (REPAIR-009).

      3. Scored.

        1. Up to 0.005 in. (0.13 mm) in depth.

        1. Accept.

        2. More than in Step.

        1. Repair, VRS6195 TASK 72-41-34-300-009 (REPAIR-009)

      4. Scratched.

        1. Up to 0.005 in. (0.13 mm) in depth.

        1. Accept.

        2. More than in Step.

        1. Repair, VRS6195, TASK 72-41-34-300-009 (REPAIR-009).

    3. SUBTASK 72-41-34-220-430 Examine the Stage 5 Upper and Lower Unison Rings Stop Rivets at Locations 3

      1. Stop Rivets.

        1. Loose.

        1. Reject.

        2. Missing.

        1. Reject.

        3. Weld cracked.

        1. Repair, VRS6544 TASK 72-41-34-300-064 (REPAIR-064).

    4. SUBTASK 72-41-34-220-406 Examine the Stage 5 Upper and Lower Unison Rings Brackets at Locations 4 and 5

    1. Refer to Figure.

      2. Screw thread inserts at locations 4 and 5.

        1. Broken.

        1. Repair, VRS6155 TASK 72-41-34-300-013 (REPAIR-013).

        2. Crossed threads.

        1. Repair, VRS6155 TASK 72-41-34-300-013 (REPAIR-013).

        3. Missing.

        1. Repair, VRS6155 TASK 72-41-34-300-013 (REPAIR-013).

    5. SUBTASK 72-41-34-220-407 Examine the Stage 5 Upper and Lower Unison Rings Bushes at Location 6

    1. Refer to Figure.

      2. Inner bore.

        1. Scored.

        1. Repair, VRS6246 TASK 72-41-34-300-050 (REPAIR-050).

        2. Scratched.

        1. Repair, VRS6246 TASK 72-41-34-300-050 (REPAIR-050).

        3. Worn.

          1. Not more than 0.201 in. (5.112 mm) in diameter.

          1. Accept.

          2. More than in Step.

          1. Repair, VRS6246 TASK 72-41-34-300-050 (REPAIR-050).

      3. Missing.

      1. Repair, VRS6246 TASK 72-41-34-300-050 (REPAIR-050).

      4. Excessive bush movement (side to side).

      1. Repair, VRS6246 TASK 72-41-34-300-050 (REPAIR-050).

    6. SUBTASK 72-41-34-220-408 Examine the Stage 5 Upper and Lower Unison Rings Dowels at Locations 7

    1. Refer to Figure.

      2. Missing.

      1. Repair, VRS6246 TASK 72-41-34-300-050 (REPAIR-050).

      3. Worn.

        1. Not less than 0.4340 in. (11.016 mm) in diameter.

        1. Accept.

        2. Less than Step.

        1. Repair, VRS6246 TASK 72-41-34-300-050 (REPAIR-050).

      4. Screw thread inserts.

        1. Broken.

        1. Repair, VRS6156 TASK 72-41-34-300-014 (REPAIR-014).

        2. Crossed threads.

        1. Repair, VRS6156 TASK 72-41-34-300-014 (REPAIR-014).

        3. Missing.

        1. Repair, VRS6156 TASK 72-41-34-300-014 (REPAIR-014).

    7. Figure: Stage 5 Upper and Lower Unison Rings - Inspection Locations

    Stage 5 Upper and Lower Unison Rings - Inspection Locations

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedure to include instructions to repair worn/missing bushes and dowels at locations 6 and 7 respectively in accordance with VRS6246 and VRS6156. (15VR856)

Change Type:

Added reference for VRS6544. (15VR839)