TASK 72-50-21-200-001-C00 LPT Case - Examine, Inspection-001

DMC:V2500-A0-72-50-2101-00C-300A-C|Issue No:005.00|Issue Date:2018-08-01

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 72-50-21-200-001-C00 LPT Case - Examine, Inspection-001

Effectivity

FIG/ITEM

PART NO.

01-010

3A2183

01-010

3A2447

General

This TASK gives the procedure for the inspection of the LP turbine case.

Fig/item numbers in parentheses in the procedure agree with those used in the IPC.

The policy that is necessary for inspection is given in the SPM TASK 70-20-00-200-501.

All parts must be cleaned before any part is examined. Refer to TASK 72-50-21-100-000 (CLEANING-000).

All 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 those parts which must have a crack test is given in SUBTASK 72-50-21-230-076. Do the 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 later date.

All 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 numbers are in the SPM.

References

Refer to the SPM for data on these items.

Definitions 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 70-20-00-200-501

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

NOTE

Special tools are identified in the procedure by the tool primary number.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Straight edgeLOCALStraight edge
Depth gageLOCALDepth gage
IAE 2M14176 Inspection gage0AM53IAE 2M141761
IAE 2M14177 Inspection gage0AM53IAE 2M141771
IAE 2M14178 Inspection gage0AM53IAE 2M141781
IAE 2M14179 Inspection gage0AM53IAE 2M141791
IAE 2M14180 Inspection gage0AM53IAE 2M141801

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-21-220-114 General Instructions for the Inspection of the LP Turbine Case

    1. Inspect outer duct support hook for open stop holes which are 0.085 to 0.095 in. (2.16 to 2.41 mm) diameter. Plug all open stop holes, refer to VRS4343, TASK 72-50-21-300-031 (REPAIR-031).

    2. SUBTASK 72-50-21-230-076 Examine the LP Turbine Case for Cracks

    1. Refer to Figure and Figure.

    2. Clean the part. Refer to TASK 72-50-21-100-000 (CLEANING-000).

      3. Do the test for cracks on the part that is given below. Use the applicable penetrant procedure.

        PART IDENT

        TASK/SUBTASK

        LP turbine case and rotor

        1. Cracked at the borescope holes

        1. Repair, VRS4474 TASK 72-50-21-300-036 (REPAIR-036)

        2. Cracked at the outer duct support hook.

          1. Cracked at area A3.

          1. Accept.

          2. Cracked through a cooling air hole.

          1. Accept.

          3. Cracked at area A3, going across into area A4.

          1. Repair, VRS4343 TASK 72-50-21-300-031 (REPAIR-031).

          4. More than in Step.

          1. Repair, VRS4344 TASK 72-50-21-300-032 (REPAIR-032).

        3. Cracked at the vane retaining rails.

          1. Cracked not longer than 0.080 in. (2.03 mm).

          1. Accept.

          2. More than in Step.

          1. Reject.

        4. Cracked at stage 4 front hook.

          1. Cracked in area A7.

          1. Accept.

          2. Other than in Step.

          1. Reject.

        5. Cracked surface.

        1. Reject.

  3. SUBTASK 72-50-21-230-076-002 Deleted

    4. SUBTASK 72-50-21-220-115 Examine the LP Turbine Case for Surface Damage

      1. Nicked, dented, pitted.

        1. Not more than 0.004 in. (0.10 mm) maximum depth, no raised material.

        1. Accept.

        2. Other than in Step.

        1. Repair, VRS4001 TASK 72-50-21-300-001 (REPAIR-001).

    5. SUBTASK 72-50-21-220-116 Examine the Borescope Boss of the LP Turbine Case

      1. Examine the borescope boss.

        1. Loose rivets or damaged boss

        1. Repair, VRS4341 TASK 72-50-21-300-030 (REPAIR-030)

        2. Local fretting.

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

          1. Accept.

          2. More than in Step.

          1. Repair, VRS4341 TASK 72-50-21-300-030 (REPAIR-030).

    6. SUBTASK 72-50-21-220-117 Examine the Locating Pin at the Rear Flange of the LP Turbine Case at Diameter D1

    1. Refer to Figure.

      2. Examine the locating pin.

        1. Loose locating pin.

        1. Repair, VRS4002 TASK 72-50-21-300-002 (REPAIR-002)

        2. Local fretting.

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

          1. Accept.

          2. More than in Step.

          1. Repair, VRS4002 TASK 72-50-21-300-002 (REPAIR-002).

    7. SUBTASK 72-50-21-220-118 Examine the Identification Bracket and Plate of the LP Turbine Case

      1. Examine the bracket and the plate.

        1. Loose bracket because of worn rivets

        1. Repair, VRS4014 TASK 72-50-21-300-011 (REPAIR-011)

        2. Loose identification plate because of worn clip nuts

        1. Repair, VRS4014 TASK 72-50-21-300-011 (REPAIR-011)

    8. SUBTASK 72-50-21-220-119 Examine the Front Flange of the LP Turbine Case

    1. Refer to Figure.

      2. Examine the pin hole diameter.

        1. Worn, measure diameter D2.

          1. Not more than 0.258 in. (6.55 mm).

          1. Accept.

          2. More than in Step.

          1. Repair, VRS4034 TASK 72-50-21-300-023 (REPAIR-023).

      3. Examine the snap diameter D3. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension.

        1. Not less than 28.527 in. (724.59 mm) and not more than 28.533 in. (724.73 mm).

        1. Accept.

        2. More than in Step.

        1. Repair, VRS4010 TASK 72-50-21-300-007 (REPAIR-007).

      4. Examine the surface in area A1 for wear.

        1. Local fretting.

          1. Not more than 0.0010 in. (0.025 mm) maximum depth.

          1. Accept.

          2. More than in Step.

          1. Repair, VRS4344 TASK 72-50-21-300-032 (REPAIR-032).

    9. SUBTASK 72-50-21-220-120 Examine the Rear Flange of the LP Turbine Case

    1. Refer to Figure.

      2. Examine the snap diameter D4. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension.

        1. Not more than 38.664 in. (982.07 mm) and not less than 38.648 in. (981.66 mm).

        1. Accept

        2. Less than in Step.

        1. Repair, VRS4011 TASK 72-50-21-300-008 (REPAIR-008).

      3. Examine the surface in area A2 for wear.

        1. Local fretting.

          1. Not more than 0.0010 in. (0.025 mm) maximum depth.

          1. Accept.

          2. More than in Step.

          1. Reject.

    10. SUBTASK 72-50-21-220-182 Examine the Vane Hooks for Wear

    1. Refer to Figure.

      2. Examine the surface in area A6.

        1. Fretted.

          1. Not more than 0.020 in. (0.51 mm) maximum depth, no raised material.

          1. Accept.

          2. Not more than 0.020 in. (0.51 mm) maximum depth, with raised material.

          1. Repair, VRS4001 TASK 72-50-21-300-001 (REPAIR-001)

          3. More than in (a) or (b)

          1. Reject

      3. Examine the surface at dimension D14.

        1. Worn, measure dimension D14.

          1. Not less than 0.082 in. (2.09 mm), no raised material.

          1. Accept.

          2. Not less than 0.082 in. (2.09 mm), with raised material.

          1. Repair, VRS4001 TASK 72-50-21-300-001 (REPAIR-001).

          3. Less than in (a) or (b)

          1. Reject.

    11. SUBTASK 72-50-21-220-121 Examine the LP Turbine Case Anti-Rotating Slots and the Retaining Hooks

    1. Refer to Figure.

      2. Examine the anti-rotating slots at dimension D5.

        1. Not more than 0.335 in. (8.50 mm).

        1. Accept.

        2. More than in (1)

        1. Repair, VRS4015 TASK 72-50-21-300-012 (REPAIR-012)

      3. Examine the outer duct support hook surface in area A5 for wear.

        1. Local fretting.

          1. Not more than 0.008 in. (0.20 mm) maximum depth.

          1. Accept.

          2. Not more than 0.024 in. (0.60 mm).

          1. Repair, VRS4490 TASK 72-50-21-300-040 (REPAIR-040).

          3. More than in Step.

          1. Repair, VRS4344 TASK 72-50-21-300-032 (REPAIR-032).

      4. Measure the outer duct support hook at dimension D6. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension.

        1. Not more than 0.110 in. (2.80 mm).

        1. Accept.

        2. More than in (1)

        1. Repair, VRS4344 TASK 72-50-21-300-032 (REPAIR-032)

      5. Measure the stage 7 front seal locating hook at dimension D7. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension.

        1. Not more than 0.110 in. (2.80 mm).

        1. Accept.

        2. More than in (1)

        1. Reject

      6. Measure the stage 7 rear seal locating hook at dimension D8. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension.

        1. Not more than 0.130 in. (3.30 mm).

        1. Accept

        2. More than in (1)

        1. Reject

    12. SUBTASK 72-50-21-220-122 Examine the Inner Axial Dimensions of the LP Turbine Case

      NOTE

      1. Put the LP turbine case in a vertical position with the rear end down.

      2. For the dimensional inspection at dimensions D9, D10, D11, D12 and D13, the inspection gages must be loaded by hand (refer to Figure).

    1. Refer to Figure.

      2. Measure the stage 3 rear retaining hook at dimension D9. Use the IAE 2M14176 Inspection gage 1 off. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension. Use a straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Not more than 4.876 in. (123.85 mm).

        1. Accept

        2. More than in (1)

        1. Repair, VRS4090 TASK 72-50-21-300-027 (REPAIR-027)

      3. Measure the stage 4 rear retaining hook at dimension D10. Use the IAE 2M14177 Inspection gage 1 off. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension. Use a straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Not more than 7.821 in. (198.65 mm).

        1. Accept

        2. More than in (1)

        1. Repair, VRS4090 TASK 72-50-21-300-027 (REPAIR-027)

      4. Measure the stage 5 rear retaining hook at dimension D11. Use the IAE 2M14178 Inspection gage 1 off. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension. Use a straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Not more than 10.9205 in. (277.38 mm).

        1. Accept

        2. More than in (1)

        1. Repair, VRS4090 TASK 72-50-21-300-027 (REPAIR-027)

      5. Measure the stage 6 rear retaining hook at dimension D12. Use the IAE 2M14179 Inspection gage 1 off. Do the measurements at 90, 180, 270 and 360 degrees positions and get an average dimension. Use a straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Not more than 15.2157 in. (386.48 mm).

        1. Accept

        2. More than in (1)

        1. Repair, VRS4090 TASK 72-50-21-300-027 (REPAIR-027)

      6. Calculate the dimension D13 of the stage 7 rear retaining hook as follows:

      1. Measure the dimension between the LP turbine case front and rear flange. Use a straight edge and a depth gage.

      2. Install IAE 2M14180 Inspection gage 1 off. Measure the dimension between the LP turbine case front flange and the inspection gage. Do the measurements at 90, 180, 270 and 360 degrees positions. Get an average. Use a straight edge and a depth gage.

        3. Subtract the dimension, measured in step 2, from the dimension measured in step 1.

          1. Not less than 2.002 in. (50.85 mm) minimum.

          1. Accept

          2. Less than in (a)

          1. Repair, VRS4090 TASK 72-50-21-300-027 (REPAIR-027)

    13. SUBTASK 72-50-21-220-123 Examine the Outer LP Turbine Case

    1. Refer to Figure.

      2. Examine the active clearance control mounting boss.

        1. Loose rivets

        1. Repair, VRS4403 TASK 72-50-21-300-033 (REPAIR-033)

        2. Damaged boss

        1. Repair, VRS4403 TASK 72-50-21-300-033 (REPAIR-033)

        3. Local fretting.

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

          1. Accept

          2. More than in Step.

          1. Repair, VRS4403 TASK 72-50-21-300-033 (REPAIR-033)

        4. Worn, damaged or missing inserts

        1. Repair, VRS4049 TASK 72-50-21-300-026 (REPAIR-026)

      3. Examine the LP turbine case for overheating.

        1. Equal color without the local heat spots, that occur if the LP turbine case became too hot.

        1. Accept

        2. Other than in (1)

        1. Reject

    14. Figure: Examine the LP Turbine Case

    Examine the LP Turbine Case

    Figure: Examine the LP Turbine Case

    Examine the LP Turbine Case

    Figure: Examine the LP Turbine Case

    Examine the LP Turbine Case

    Figure: Examine the Inner Axial Dimensions of the LP Turbine Case

    Examine the Inner Axial Dimensions of the LP Turbine Case

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Revised the procedure to add technical changes for LP Turbine Case. (93VM505E)

Change Type:

Editorial Change

Manufacturer Code:0AM53
Enterprise Name:IAE INTERNATIONAL AERO ENGINES AG
BU Name:NULL
Building:SUITE 400
Street:628 HEBRON AVENUE
City:GLASTONBURY
State:CT
Zip Code:06033
Country:USA
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Depth gage
Tool Name:Depth gage
Manufacturer Code:0AM53
Tool Number:IAE 2M14176
Tool Name:IAE 2M14176 Inspection gage
Manufacturer Code:0AM53
Tool Number:IAE 2M14177
Tool Name:IAE 2M14177 Inspection gage
Manufacturer Code:0AM53
Tool Number:IAE 2M14178
Tool Name:IAE 2M14178 Inspection gage
Manufacturer Code:0AM53
Tool Number:IAE 2M14179
Tool Name:IAE 2M14179 Inspection gage
Manufacturer Code:0AM53
Tool Number:IAE 2M14180
Tool Name:IAE 2M14180 Inspection gage
Manufacturer Code:LOCAL
Tool Number:Straight edge
Tool Name:Straight edge