TASK 72-50-32-200-004-D00 LPT Stage 4 Blade - Examine, Inspection-004

DMC:V2500-A0-72-50-3204-00D-300A-C|Issue No:003.00|Issue Date:2015-11-01

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 72-50-32-200-004-D00 LPT Stage 4 Blade - Examine, Inspection-004

Effectivity

FIG/ITEM

PART NO.

01-150

3A2374

General

This TASK gives the procedure for the inspection of the stage 4 turbine blades.

If there are signs of overheating, refer to TASK 72-50-32-200-007-A00 (INSPECTION/CHECK-007, CONFIG-001) before you do this inspection.

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

A ** following any 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 data.

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 the TASK 72-50-32-100-000 (72-050-032,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 72-50-32-230-001. 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 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
IAE 2M14189 Inspection gage0AM53IAE 2M141891
IAE 2M14193 Inspection mounting block0AM53IAE 2M141931

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-32-230-183 Examine the Stage 4 Turbine Blades for Cracks

    1. Clean the parts. Refer to TASK 72-50-32-100-000 (CLEANING-000).

      2. Do the test for cracks on the parts that are given below. Use the applicable penetrant procedure.

        PART IDENT TASK/SUBTASK

        Stage 4 turbine blades

        1. Cracked in all areas without the shroud notches or the knife edge seals

        1. Reject

        2. Cracked in the shroud notches

        1. Repair, VRS4345 TASK 72-50-32-300-058 (REPAIR-058)

        3. Cracked in the knife edge seals.

          1. Not more than 0.040 in. (1.00 mm) maximum depth

          1. Repair, VRS4301 TASK 72-50-32-300-062 (REPAIR-062)

          2. More than in Step

          1. Repair, VRS4519 TASK 72-50-32-300-070 (REPAIR-070)

    2. SUBTASK 72-50-32-220-422 Examine the Stage 4 Turbine Blades for Defects

    1. Refer to Figure.

      NOTE

      This examination includes surface defects which are permitted per production standard. Surface defects are not caused by hit of some objects or service operation.
      Fluorescent penetrant examine or visually examine areas A1 to A7 for surface defects. Refer to the SPM TASK 70-23-08-230-501 or SPM TASK 70-21-01-220-501.
      Surface defects larger than 0.015 in. (0.38 mm) diameter must have a bottom which can be seen.
      Surface defects not larger than 0.015 in. (0.38 mm) can be non bottomed.
      A cluster is a defect of four or more surface defects, clearly apart, which can be contained within a 0.200 in. (5.08 mm) diameter circle. In the cluster all surface defects must be 0.015 in. (0.38 mm) or less
      If not differently specified, surface defects of 0.015 in. (0.38 mm) or less must be ignored if they are not found in linear alignment or clusters, or in areas where 0.015 in. (0.38 mm) is the maximum permitted size.
      In areas where 0.015 in. (0.38 mm) is the maximum permitted size, surface defects 0.010 in. (0.25 mm) or less, not in linear alignment or clusters must be ignored.
      If acceptable limits on coated surfaces are ecxeeded, remove the coating and make an estimate of the surface defects again. Repair coating per VRS4294 TASK 72-50-32-300-041 (REPAIR-041) or VRS4296 TASK 72-50-32-300-043 (REPAIR-043).

      2. Examine the surface in area A1.

        1. Six defects, each on inner side, outer side or shroud edges, 0.046 in. (1.17 mm) maximum diameter, 0.125 in. (3.18 mm) minimum separation

        1. Accept

        2. Five clusters, 0.250 in. (6.35 mm) minimum separation

        1. Accept

        3. More than in Step or Step

        1. Reject

      3. Examine the surface in area A2 (hardface area).

        1. Two defects per 0.031 in. (0.79 mm) maximum diameter, clearly separated

        1. Accept

        2. Two linear defects including cracks or lack of fusion, 0.062 in. (1.58 mm) maximum length, clearly separated

        1. Accept

        3. More than in Step or Step or indications at break edge

        1. Reject

      4. Examine the surface in area A3.

        1. Six defects on inner or outer radius, 0.031 in. (0.79 mm) maximum diameter, 0.125 in. (3.18 mm) minimum separation

        1. Accept

        2. More than in Step

        1. Reject

      5. Examine the surface in area A4.

        1. Eight defects total per side, in area A4.1 0.031 in. (0.79 mm) maximum diameter, 0.125 in. (3.18 mm) minimum separation, in area A4.2 0.046 in. (1.17 mm) maximum diameter 0.125 in. (3.18 mm) minimum separation

        1. Accept

        2. Five clusters per side, 0.250 in. (6.35 mm) minimum separation

        1. Accept

        3. More than in Step or Step

        1. Reject

      6. Examine the surface in area A5.

        1. Six defects per side, per area for a total of 24 not back to back 0.015 in. (0.38 mm) maximum diameter, 0.125 in. (3.18 mm) minimum separation

        1. Accept

        2. More than in Step

        1. Reject

      7. Examine the surface in area A6.

        1. Six defects, each on inner side, outer side or side faces, 0.046 in. (1.17 mm) maximum diameter, 0.125 in. (3.18 mm) minimum separation

        1. Accept

        2. Five clusters, 0.250 in. (6.35 mm) minimum separation

        1. Accept

        3. More than in Step or Step

        1. Reject

      8. Examine the surface in area A7.

        1. Six defects on each side of loaded and unloaded surfaces, 0.015 in. (0.38 mm) maximum diameter, 0.125 in. (3.18 mm) minimum separation

        1. Accept

        2. Six defects on each side, front or back, 0.046 in. (1.17 mm) maximum diameter, 0.125 in. (3.18 mm) minimum separation

        1. Accept

        3. More than in Step or Step or defects in radii and break edges

        1. Reject

    3. SUBTASK 72-50-32-220-423 Examine the Stage 4 Turbine Blade in Area A8 for Surface Damage

    1. Refer to Figure.

      2. Examine the knife edge seals in area A8.

        1. Dented.

          1. Not more than 0.010 in. (0.25 mm) maximum depth

          1. Repair, VRS4301 TASK 72-50-32-300-062 (REPAIR-062)

          2. More than in Step

          1. Repair, VRS4519 TASK 72-50-32-300-070 (REPAIR-070)

        2. Nicked or pitted.

          1. Not more than 0.005 in. (0.13 mm) maximum depth

          1. Repair, VRS4301 TASK 72-50-32-300-062 (REPAIR-062)

          2. More than in Step

          1. Repair, VRS4519 TASK 72-50-32-300-070 (REPAIR-070)

    4. SUBTASK 72-50-32-220-424 Examine the Stage 4 Turbine Blade in Area A9 - A23 for Surface Damage

    1. Refer to Figure.

      2. Examine the surface in area A9.

        1. Nicked, dented or pitted

        1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      3. Examine the surface in area A10.

        1. Nicked, dented, pitted.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth

          1. Accept

          2. Nicked or pitted not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

          3. More than in Step or Step

          1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      4. Examine the surface in area A11.

        1. Nicked, dented, pitted.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth

          1. Accept

          2. Nicked or pitted not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

          3. More than in Step or Step

          1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      5. Examine the surface in area A12.

        1. Nicked, dented, pitted in area A12.1.

          1. Round bottom dents not more than 0.012 in. (0.30 mm) maximum depth

          1. Accept

          2. Nicked or pitted not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

        2. Nicked, dented, pitted in area A12.2.

          1. Round bottom dents not more than 0.012 in. (0.30 mm) maximum depth

          1. Accept

          2. Nicked or pitted not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

        3. Nicked, dented, pitted in area A12.3.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth

          1. Accept

        4. More than in Step or Step or Step

        1. Repair, VRS4292 TASK 72-50-32-300-044 (REAPAIR-044)

      6. Examine the surface in area A13.

        1. Nicked, dented, pitted in area A13.1.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth

          1. Accept

          2. Nicked or pitted not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

        2. Nicked, dented, pitted in area A13.2.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth

          1. Accept

        3. More than in Step or Step

        1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      7. Examine the surface in area A14.

        1. Nicked, dented, pitted.

          1. Round bottom dents not more than 0.020 in. (0.51 mm) maximum depth, not visible from other side, not more than 10 percent of surface of area A14

          1. Accept

          2. Nicked not more than 0.004 in. (0.10 mm) maximum depth, 0.008 in. (0.20 mm) minimum separation

          1. Accept

          3. Pitted not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

          4. More than in Step or Step or Step

          1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      8. Examine the surface in area A15.

        1. Nicked, dented, pitted.

          1. Round bottom dents not more than 0.020 in. (0.51 mm) maximum depth, not visible from other side, not more than 10 percent of surface of area A15

          1. Accept

          2. Nicked not more than 0.004 in. (0.10 mm) maximum depth, 0.008 in. (0.20 mm) minimum separation

          1. Accept

          3. Pitted not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

          4. More than in Step or Step or Step

          1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      9. Examine the surface in area A16.

        1. Nicked, dented, pitted.

          1. Round bottom dents not more than 0.010 in. (0.25 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      10. Examine the surface in area A17.

        1. Nicked, dented, pitted in area A17.1.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth, no raised material

          1. Accept

        2. Nicked, dented, pitted in area A17.2.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth, no raised material

          1. Accept

        3. Rubbed in because of vane contact in area A17.2.

          1. Not more than 0.035 in. (0.9 mm) maximum depth

          1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

        4. More than in Step or Step or Step

        1. Reject

      11. Examine the surface in area A18.

        1. Nicked, dented, pitted.

          1. Round bottom dents not more than 0.005 in. (0.13 mm) maximum depth, no raised material

          1. Accept

          2. Pitted not more than 0.0027 in. (0.07 mm) maximum depth

          1. Accept

          3. More than in Step or Step

          1. Reject

      12. Examine the surface in area A19.

        1. Nicked, dented, pitted.

          1. Pitted not more than 0.0027 in. (0.07 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

      13. Examine the surface in area A20.

        1. Grooved because of airseal contact.

          1. Not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

      14. Examine the surface in area A21.

        1. Local fretted.

          1. Not more than 0.004 in. (0.10 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

        2. Pitted.

          1. Not more than 0.0027 in. (0.07 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

      15. Examine the surface in area A22.

        1. Chipped, nicked, dented or pitted

          1. Pitted not more than 0.0027 in. (0,07 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

      16. Examine the surface in area A23.

        1. Pitted.

          1. Not more than 0.0027 in. (0.07 mm) maximum depth

          1. Accept

          2. More than in Step

          1. Reject

    5. SUBTASK 72-50-32-220-425 Examine the Stage 4 Turbine Blade in Area A24 - A27 for Sulphidation

    1. Refer to Figure.

      NOTE

      Sulphidation pits have a dark bottom after dry grit abrasive blast per the SPM TASK 70-12-09-120-501.
      If dark bottom pits are visible after dry blast, remove coating per VRS4296 TASK 72-50-32-300-043 (REPAIR-043) before any part is examined.

      2. Examine the surface in area A24.

        1. Sulphidation pits or pustules.

          1. Not more than 0.0197 in. (0.500 mm) in diameter or length

          1. Accept

          2. Other than in Step

          1. Reject

      3. Examine the surface in area A25.

        1. Sulphidation pits or pustules

        1. Repair, VRS4292 TASK 72-50-32-300-044 (REPAIR-044)

      4. Examine the surface in area A26.

        1. Sulphidation pits or pustules.

          1. Not more than in 0.0157 in. (0.400 mm) in diameter or length

          1. Accept

          2. Other than in Step

          1. Reject

      5. Examine the surface in area A27.

        1. Sulphidation pits or pustules.

          1. Not more than 0.0157 in. (0,40 mm) in diameter or length if they are not connected

          1. Accept

          2. Other than in Step

          1. Reject

    6. SUBTASK 72-50-32-220-426 Examine the Stage 4 Turbine Blade for Coating Damage

    1. Refer to Figure.

      2. Examine the surface in area A10 - A18.

        1. Examine the coating.

          1. Cracked coating

          1. Repair, VRS4296 TASK 72-50-32-300-043 (REPAIR-043)

          2. Blistered, damaged or chipped coating not more than 1.000 sq.in. (645,16 sq.mm) total area per blade (shrouds and arfoil together)

          1. Repair, VRS4294 TASK 72-50-32-300-041 (REPAIR-041)

          3. Other than in Step

          1. Repair VRS4296 TASK 72-50-32-300-043 (REPAIR-043)

    7. SUBTASK 72-50-32-220-427 Examine the Outer Shroud Dimension D1 of the Turbine Blade

    1. Refer to Figure, Figure and Figure.

      2. Calibrate the dial indicator as follows:

      1. Retract the sliding block with the dial indicator to the locating block until the dial indicator point rests on the carbide pat.

      2. Adjust the dial indicator to zero position.

    3. Install the stage 4 turbine blade with the convex side down on to IAE 2M14189 Inspection gage 1 off. Make sure that the stage 4 turbine blade is correctly installed on the inspection gage.

      4. Measure the deviation against the basic outer shroud dimension.

      1. Slide the sliding block with the dial indicator to the shroud so that the dial indicator point rests on the shroud. Read the deviation on the dial indicator.

      5. Find the actual result of the outer shroud dimension D1 as follows:

      1. Add the minus or plus result of the deviation to the basic shroud band dimension 0.83 in. (21.05 mm).

      2. Monitor the actual dimension D1 of the outer shroud.

        3. Not less than 0.8224 in. (20.89 mm)

        1. Accept

        4. Less than in Step and not less than 0.7957 in. (20.21 mm)

        1. Repair, VRS4287 TASK 72-50-32-300-045 (REPAIR-045)

        5. Less than in Step

        1. Reject

    6. Return the sliding block with the dial indicator to the initial position.

    7. Remove the stage 4 turbine blade from the inspection gage.

    8. SUBTASK 72-50-32-220-428 Examine the Twist of the Turbine Blade

    1. Refer to Figure, Figure and Figure.

      2. Install the stage 4 turbine blade on to the IAE 2M14193 Inspection mounting block 1 off as follows:

      1. Turn back the clamping screw 2.

      2. Turn back the clamping screw 1.

      3. Install the stage 4 turbine blade with the rear knife edge seal located to the front of the inspection mounting block. The blade root nose must touch the locating block.

      4. Press the stage 4 turbine blade with finger pressure to the locating block. Turn clockwise the clamping screw 1 by hand to lock the blade in vertical position on the inspection mounting block.

      5. Turn clockwise the clamping screw 2 by hand to safety the stage 4 turbine blade in position on the inspection mounting block.

    3. Turn by 90 degrees the inspection mounting block to bring the stage 4 turbine blade in horizontal position. The rear knife edge seal of the stage 4 turbine blade must be down.

      4. Measure the deviation between point P1 and point P2 on the front blade shroud as follows:

      1. Adjust the tridimensional measuring unit at point P1 to zero.

      2. Measure the deviation D2 in distence of x = 0.80 in. (20.32 mm) from point P1 to point P2.

      3. Monitor the result.

        4. Dimension D2 is not more than 0.0192 in. (0.488 mm)

        1. Accept

        5. Other than in Step

        1. Repair, VRS4305 TASK 72-50-32-300-046 (REPAIR-046)

    9. SUBTASK 72-50-32-220-429 Examine the Knife Edge Seal of the Turbine Blade

    1. Refer to Figure, Figure and Figure.

      2. Measure the dimension D3 between the front knife edge seal and the plane A on the inspection mounting block.

        1. Not less than 6.247 in. (158.67 mm)

        1. Accept

        2. Less than in Step

        1. Repair, VRS4519 TASK 72-50-32-300-070 (REPAIR-070)

      3. Measure the dimension D4 between the rear knife edge seal and the plane A on the inspection mounting block.

        1. Not less than 6.366 in. (161.70 mm)

        1. Accept

        2. Less than in Step

        1. Repair, VRS4519 TASK 72-50-32-300-070 (REPAIR-070)

    4. Remove the stage 4 turbine blade from the inspection mounting block.

    10. SUBTASK 72-50-32-220-430 Examine the Blade Root of the Turbine Blade

    1. Refer to Figure.

      2. Measure the dimension D5.

        1. Not less than 0.446 in. (11.33 mm)

        1. Accept

        2. Less than in Step

        1. Reject

    11. Figure: Examine the Stage 4 Turbine Blades

    Examine the Stage 4 Turbine Blades

    Figure: Examine the Stage 4 Turbine Blades

    Examine the Stage 4 Turbine Blades

    Figure: Examine the Stage 4 Turbine Blades

    Examine the Stage 4 Turbine Blades

    Figure: Examine the Stage 4 Turbine Blades

    Examine the Stage 4 Turbine Blades

    Figure: Install the Stage 4 Turbine Blades on to the Inspection Mounting Block

    Install the Stage 4 Turbine Blades on to the Inspection Mounting Block

    Figure: Install the Stage 4 Turbine Blades on to the Inspection Mounting Block

    Install the Stage 4 Turbine Blades on to the Inspection Mounting Block

    Figure: Install the Stage 4 Turbine Blades on to the Inspection Gage

    Install the Stage 4 Turbine Blades on to the Inspection Gage

    Figure: Install the Stage 4 Turbine Blades on to the Inspection Gage

    Install the Stage 4 Turbine Blades on to the Inspection Gage

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Updated illustration. (EC 08VM510A / RN-V2500-194/A1)

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:0AM53
Tool Number:IAE 2M14189
Tool Name:IAE 2M14189 Inspection gage
Manufacturer Code:0AM53
Tool Number:IAE 2M14193
Tool Name:IAE 2M14193 Inspection mounting block