TASK 72-41-34-200-006-D00 HPC Stage 3 Unison Rings - Examine, Inspection-006

DMC:V2500-A5-72-41-3423-00D-300A-C|Issue No:002.00|Issue Date:2019-08-01

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

V2500-A5

Common Information

TASK 72-41-34-200-006-D00 HPC Stage 3 Unison Rings - Examine, Inspection-006

Effectivity

FIG/ITEM PART NO.

03-440

6A9110

03-540

6A9112

General

This TASK gives the procedure for the inspection of the stage 3 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 variants refer to the EIPC.

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 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 numbers are in SPM.

A part must have lever arm holes measured to within acceptance/repair limits of Step regardless of level of workscope.

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 is contained in this TASK. For more data on these items refer to 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 72-41-34-230-183 Examine the Stage 3 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 3 upper and lower unison rings

        1. Cracked.

        1. Reject.

    2. SUBTASK 72-41-34-220-603 Examine the Stage 3 Upper and Lower Unison Ring Body Outer Surfaces at Locations 1 and 2

    1. Refer to 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, VRS6159 TASK 72-41-34-300-043 (REPAIR-043).

      3. Scored.

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

        1. Accept.

        2. More than in Step.

        1. Repair, VRS6159 TASK 72-41-34-300-043 (REPAIR-043).

      4. Scratched.

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

        1. Accept.

        2. More than in Step.

        1. Repair, VRS6159 TASK 72-41-34-300-043 (REPAIR-043).

    3. SUBTASK 72-41-34-220-604 Examine the Stage 3 Upper and Lower Unison Rings Holes and Countersinks at Location 3

    1. Refer to Figure, Figure and Figure.

      2. Measure 16 lever arm holes.

        1. If all 16 lever arm holes are 0.4843 in. (12.300 mm) or less in the largest diameter.

        1. Accept.

        2. If one or more lever arm hole is greater than 0.4843 in. (12.300 mm) in any diameter.

        1. Reject.

      3. Scored.

      1. Reject.

    4. SUBTASK 72-41-34-220-605 Examine the Stage 3 Upper and Lower Unison Ring Holes at Locations 5 and 7

    1. Refer to 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 edges.

      1. Reject.

        2. Wear.

          1. If the diameter of the hole is less than 0.2516 in. (6.390 mm).

          1. Accept.

          2. More than in step D.(1).

          1. Reject.

    5. SUBTASK 72-41-34-220-606 Examine the Stage 3 Upper and Lower Unison Ring Holes at Location 6

    1. Refer to 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 edges.

      1. Reject.

        2. Wear.

          1. If the diameter of the hole is less than 0.2342 in. (5.950 mm).

          1. Accept.

          2. More than in step D.(1).

          1. Reject.

    6. SUBTASK 72-41-34-220-607 Examine the Stage 3 Upper and Lower Unison Ring Holes at Location 4

    1. Refer to 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 edges.

      1. Reject.

        2. Wear.

          1. If the diameter of the hole is less than 0.1913 in. (4.860 mm).

          1. Accept.

          2. More than in step D.(1).

          1. Reject.

    7. SUBTASK 72-41-34-220-608 Examine the Stage 3 Upper and Lower Unison Ring Holes at Location 8

    1. Refer to 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 edges.

      1. Reject.

      4. Wear.

        1. If the diameter of the hole is less than 0.2404 in. (6.106 mm).

        1. Accept.

        2. More than in Step.

        1. Reject.

    8. SUBTASK 72-41-34-220-609 Examine the Stage 3 Lower Unison Ring Dowels at Location 9

    1. Refer to Figure.

      2. Missing.

      1. Reject.

      3. Burred.

      1. Reject.

      4. Scored.

      1. Reject.

      5. Loose.

      1. Reject.

      6. Diameter.

        1. More than 0.1575 in. (4.000 mm).

        1. Accept.

        2. Less than Step.

        1. Reject.

    9. SUBTASK 72-41-34-220-610 Examine the Stage 3 Upper Unison Ring Rigging Pin Slot at Location 10 (1 position)

    1. Refer to 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 edges.

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

        1. Accept.

        2. More than in Step.

        1. Reject.

      4. Wear.

        1. If the diameter of the hole is less than 0.2779 in. (7.060 mm).

        1. Accept.

        2. More than in Step.

        1. Reject.

    10. SUBTASK 72-41-34-220-611 Examine the Stage 3 Upper Unison Ring Rigging Pin Slot at Location 11 (1 position)

    1. Refer to 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 edges.

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

        1. Accept.

        2. More than in Step.

        1. Reject.

      4. Wear.

        1. If the diameter of the hole is less than 0.2413 in. (6.130 mm).

        1. Accept.

        2. More than in Step.

        1. Reject.

    11. Figure: Stage 3 Upper Unison Ring - Inspection Locations

    Stage 3 Upper Unison Ring - Inspection Locations

    Figure: Stage 3 Upper Unison Ring - Inspection Locations

    Stage 3 Upper Unison Ring - Inspection Locations

    Figure: Stage 3 Lower Unison Ring - Inspection Locations

    Stage 3 Lower Unison Ring - Inspection Locations

    Figure: Stage 3 Unison Ring Lever Arm Hole - Inspection Locations

    Stage 3 Unison Ring Lever Arm Hole - Inspection Locations

    Stage 3 Unison Ring Lever Arm Hole - Inspection Locations

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedure to update dimensions. (18VG407)