TASK 72-50-21-200-001-A00 LPT Case - Examine, Inspection-001

DMC:V2500-A0-72-50-2101-00A-300A-C|Issue No:003.00|Issue Date:2015-05-01

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-A00 LPT Case - Examine, Inspection-001

Effectivity

FIG/ITEM

PART NO.

01-010

3A0807

01-010

3A0990

01-010

3A0991

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 the 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 72-50-21-230-051. Do the test before the part is visually examined.

A ** following repair referenced in this inspection indicates that the repair is not yet published in the current revision of the manual and the part must be rejected. Contact IAE for additional information concerning FAA approved repair date.

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 72-50-21-220-051 General Instructions for the Inspection of the LP Turbine Case (01-010)

    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 72-50-21-230-051-001 Examine the LP Turbine Case for Cracks

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

      2. 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, VRS4012 TASK 72-50-21-300-009 (REPAIR-009)

        2. Cracked at the outer duct support hook.

          3. Cracked at area A3

          1. Accept

          4. Cracked through a cooling air hole

          1. Accept

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

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

          6. More than in (c)

          1. Repair, VRS4476 TASK 72-50-21-300-037 (REPAIR-037)

        7. Cracked at the vane retaining rails.

          8. Cracked not longer than 0.08in. (2.03 mm)

          1. Accept

          9. More than in (a)

          1. Reject

        2. Cracked surface

        1. Reject

    3. SUBTASK 72-50-21-230-051-002 Examine the LP Turbine Case for Cracks

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

      2. 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, VRS4012 TASK 72-50-21-300-009 (REPAIR-009)

        2. Cracked at the outer duct support hook.

          3. Cracked at area A3

          1. Accept

          4. Cracked through a cooling air hole

          1. Accept

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

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

          6. More than in (c)

          1. Repair, VRS4476 TASK 72-50-21-300-037 (REPAIR-037)

        7. Cracked at the vane retaining rails.

          8. Cracked not longer than 0.08in. (2.03 mm)

          1. Accept

          9. More than in (a)

          1. Reject

        2. Cracked surface

        1. Reject

    4. SUBTASK 72-50-21-220-052 Examine the LP Turbine Case for Surface Damage

      1. Examine the surface of the LP turbine case for nicks.

        1. Nicked, maximum 0.004in. (0.1 mm) in depth, no lifted material

        1. Accept

        2. Other than in (1)

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

      2. Examine the surface of the LP turbine case for dents.

        1. Dented, maximum 0.004in. (0.1 mm) in depth, no lifted material

        1. Accept

        2. Other than in (1)

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

      3. Examine the surface of the LP turbine case for pits.

        1. Pitted, maximum 0.004in. (0.1 mm) in depth, no lifted material

        1. Accept

        2. Other than in (1)

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

    5. SUBTASK 72-50-21-220-053 Examine the Borescope Boss of the LP Turbine Case

      1. Examine the borescope boss.

        1. Loose rivets

        1. Repair, VRS4013 TASK 72-50-21-300-010 (REPAIR-010)

        2. Damaged boss

        1. Repair, VRS4013 TASK 72-50-21-300-010 (REPAIR-010)

        2. Local fretting.

          3. Up to 0.002in. (0.05 mm)

          1. Accept

          4. Other than in (a)

          1. Repair, VRS4013 TASK 72-50-21-300-010 (REPAIR-010)

    6. SUBTASK 72-50-21-220-054 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.

          3. Up to 0.002in. (0.05 mm)

          1. Accept

          4. Other than in (a)

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

    7. SUBTASK 72-50-21-220-055 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. Worn clip nuts

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

    8. SUBTASK 72-50-21-220-056 Examine the Front Flange of the LP Turbine Case

    1. Refer to: Figure

      2. Examine the pin hole diameter D2.

        1. Worn between 0.2531 and 0.2577in. (6.43 and 6.55 mm)

        1. Accept

        2. More than in (1)

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

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

        1. Between 28.5270 and 28.5327in. (724.59 and 724.73 mm)

        1. Accept

        2. More than in (1)

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

      4. Examine the location face at area A1 for wear.

        1. Local fretting maximum 0.001in. (0.025 mm) in depth

        1. Accept

        2. More than in (1)

        1. Repair, VRS4476 TASK 72-50-21-300-037 (REPAIR-037)

    9. SUBTASK 72-50-21-220-057 Examine the Rear Flange of the LP Turbine Case

    1. Refer to: Figure

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

        1. Between 38.6480 and 38.6642in. (981.66 and 982.07 mm)

        1. Accept

        2. Less than in (1)

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

      3. Examine the location face at area A2 for wear.

        1. Local fretting maximum 0.001in. (0.025 mm) in depth

        1. Accept

        2. More than in (1)

        1. Reject

    10. SUBTASK 72-50-21-220-180 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. (0.5 mm) maximum depth, no raised material

          1. Accept

          2. Not more than 0.020 in. (0.5 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 0.0823 in. (2.09 mm), no raised material

          1. Accept

          2. Not less than 0.0823 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 72-50-21-220-058 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. Between 0.3228 and 0.3346in. (8.2 and 8.5 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 location face at area A5 for wear.

        1. Local fretting maximum 0.008 in. (0.02 mm) in depth

        1. Accept

        2. Up to 0.0236 in. (0.60 mm)

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

        3. More than in (2)

        1. Repair, VRS4476 TASK 72-50-21-300-037 (REPAIR-037)

      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. Between 0.0984 and 0.1102 in. (2.5 and 2.8 mm)

        1. Accept

        2. More than in (1)

        1. Repair, VRS4476 TASK 72-50-21-300-037 (REPAIR-037)

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

        1. Between 0.1024 and 0.1102in. (2.6 and 2.8 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 the 90, 180, 270 and 360 degrees positions and get an average dimension.

        1. Between 0.1220 and 0.1299in. (3.1 and 3.3 mm)

        1. Accept

        2. More than in (1)

        1. Reject

    12. SUBTASK 72-50-21-220-059 Examine the Inner Axial Dimensions of the LP Turbine Case

      NOTE

      1. Put the LP turbine case in vertical position with 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 straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Up to 4.876in. (123.85 mm)

        1. Accept

        2. More than in (1)

        1. Repair, VRS4009 TASK 72-50-21-300-006 (REPAIR-006)

      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 straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Up to 7.821in. (198.65 mm)

        1. Accept

        2. More than in (1)

        1. Repair, VRS4009 TASK 72-50-21-300-006 (REPAIR-006)

      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 straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Up to 10.9205in. (277.38 mm)

        1. Accept

        2. More than in (1)

        1. Repair, VRS4009 TASK 72-50-21-300-006 (REPAIR-006)

      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 straight edge, installed on the LP turbine case front flange and measure with a depth gage.

        1. Up to 15.2157in. (386.48 mm)

        1. Accept

        2. More than in (1)

        1. Repair, VRS4009 TASK 72-50-21-300-006 (REPAIR-006)

      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 straight edge and 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 the straight edge and the depth gage.

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

          1. 2.0020in. (50.85 mm) minimum

          1. Accept

          2. Less than in (a)

          1. Repair, VRS4009 TASK 72-50-21-300-006 (REPAIR-006)

    13. SUBTASK 72-50-21-220-060 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)

          2. Local fretting.

            1. Up to 0.002 in. (0.05 mm)

            1. Accept

            2. Other than in (a)

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

        3. Worn, damaged or missing inserts

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

      3. Examine the LP turbine case for correct color.

        1. Incorrect but 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 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 Figure 1 to change Stages 5 and 7 to Stages 5 thru 7. (PSCOMM CHC455)

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