TASK 72-00-00-200-006 Engine General - Examine (Borescope) The LPT Stage 3 Blades and Vanes, Inspection-006

DMC:V2500-A0-72-00-0000-08A-312A-B|Issue No:009.00|Issue Date:2020-05-01

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 72-00-00-200-006 Engine General - Examine (Borescope) The LPT Stage 3 Blades and Vanes, Inspection-006

General

This TASK gives the procedure for the borescope inspection of the stage 3 turbine blades and vanes. For the stage 7 turbine blades and vanes, refer to TASK 72-00-00-200-007 (INSPECTION/CHECK-007).

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

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

For standard torque data and procedures refer to the SPM TASK 70-41-00-400-501.

Assembly tolerances are included in this procedure.

Lubricate all threads and abutment faces of nuts and bolts with CoMat 10-129A ANTI-SEIZE PASTE unless other lubricants are referred to in the procedure.

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 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.

Definition of Damage SPM TASK 70-02-02-350-501

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

To identify the consumable materials refer to the PCI.

NOTE

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

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
IAE 6F10408 Borescope0AM53IAE 6F104081

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 02-119 LOCKWIRELOCALCoMat 02-119
CoMat 10-129A ANTI-SEIZE PASTE71984CoMat 10-129A

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-00-00-020-063 Remove the Borescope Blanking Plugs

    1. Refer to Figure.

    2. Clean each borescope plug adjacent area before disassembly. Refer to the SPM TASK 70-11-26-300-503.

      3. WARNING

        MAKE SURE THAT THE BLANKING PLUGS ARE SUFFICIENTLY COOL BEFORE REMOVAL, BECAUSE THE TEMPERATURE STAYS HIGH AFTER ENGINE SHUT DOWN.

        Remove the two blanking plugs from the LP turbine.

      1. Remove the lockwire.

      2. WARNING

        DURING DISASSEMBLY DO NOT BREATHE DUST OF THE LOOSENED BOLTS. PREVENT SKIN AND EYE CONTACT WITH RELEASED DUST. THE DUST CONTAINS NICKEL PARTICLES WHICH CAN POSE A HEALTH HAZARD. BEFORE DISASSEMBLY LUBRICATE ACCESSIBLE BOLTS AND BOLT HEADS, NUTS AND EXPOSED THREADS WITH AN APPROVED, SUITABLE PENETRANT OIL. WEAR A FACE MASK AND GOGGLES. DO NOT REMOVE DUST DEPOSITS WITH COMPRESSED AIR. REMOVE ANY SURFACE DUST PARTICLES WITH A DISPOSABLE DAMP RAG OR SIMILAR. AFTER END OF THIS PROCEDURE CLEAN YOUR HANDS AND EXPOSED SKIN WHERE POSSIBLE.

        Loosen and remove the two bolts that attach each blanking plug.

      3. CAUTION

        MAKE SURE THAT THE SLEEVE FLANGED BUSHINGS DO NOT FALL OUT. IF THE PARTS FALL THEY WILL BE DAMAGED.

        Remove each blanking plug, together with the spacer plate(s). Make a note of the quantity of spacer plates at each blanking plug location.

      4. Remove the sleeve flanged bushings.

    2. SUBTASK 72-00-00-420-064 Install the Borescope Probe

    1. WARNING

      DO NOT LET UNWANTED MATERIAL GET IN TO THE BORESCOPE LOCATION HOLES OR BOLT HOLES.

      CAUTION

      DO NOT PUT THE BORESCOPE PROBE MORE THAN 4.9 INCH (124 MM) INTO THE LP TURBINE.

      Refer to Figure.

    3. SUBTASK 72-00-00-220-082 Examine the Stage 3 Turbine Blades for Cracks

    1. NOTE

      Do the examination to the extent possible.

      Refer to Figure.

      2. Examine all areas for cracks.

        1. Cracked

        1. Reject

    4. SUBTASK 72-00-00-220-083 Examine the Stage 3 Turbine Blades for Nicks and Pits

    1. Refer to Figure.

      2. Examine the surface in area A1.

        1. Nicked or pitted not more than 0.005 in. (0.13 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      3. Examine the surface in area A2.

        1. Nicked or pitted not more than 0.020 in. (0.51 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

      4. Examine the surface in area A3.1.

        1. Nicked or pitted not more than 0.039 in. (1.00 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

      5. Examine the surface in area A4.1.

        1. Nicked or pitted not more than 0.010 in. (0.25 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      6. Examine the surface in area A3.2 and A4.2.

        1. Nicked or pitted not more than 0.005 in. (0.13 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      7. Examine the surface in area A3.3.

        1. Nicked or pitted not more than 0.020 in. (0.51 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      8. Examine the surface in area A5 and A6.

        1. Nicked or pitted not more than 0.027 in. (0.70 mm) maximum depth, not more than 10 percent of areas A5 and A6

        1. Accept

        2. Other than in Step

        1. Repair, VRS4605**

      9. Examine the surface in area A7.

        1. Nicked or pitted not more than 0.005 in. (0.13 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      10. Examine the surface in area A8.

        1. Nicked or pitted not more than 0.005 in. (0.13 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

      11. Examine the surface in area A9.

        1. Nicked or pitted not more than 0.020 in. (0.51 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

    5. SUBTASK 72-00-00-220-084 Examine the Stage 3 Turbine Blades for Dents

    1. Refer to Figure.

      2. Examine the surface in area A1.

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

        1. Accept

        2. More than in Step

        1. Reject

      3. Examine the surface in area A2.

        1. Round bottom dents not more than 0.020 in. (0.51 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

      4. Examine the surface in area A3.1.

        1. Round bottom dents not more than 0.039 in. (1.00 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

      5. Examine the surface in area A4.1.

        1. Round bottom dents not more than 0.024 in. (0.60 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      6. Examine the surface in area A3.2 and A4.2.

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

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      7. Examine the surface in area A3.3.

        1. Round bottom dents not more than 0.020 in. (0.51 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Repair, VRS4605**

      8. Examine the surface in area A5 and A6.

        1. Round bottom dents not more than 0.027 in. (0.70 mm) maximum depth, not more than 10 percent of areas A5 and A6

        1. Accept

        2. Other than in Step

        1. Reject

      9. Examine the surface in area A7.

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

        1. Accept

        2. More than in Step

        1. Reject

      10. Examine the surface in area A8.

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

        1. Accept

        2. More than in Step

        1. Reject

      11. Examine the surface in area A9.

        1. Round bottom dents not more than 0.024 in. (0.60 mm) maximum depth

        1. Accept

        2. More than in Step

        1. Reject

    6. SUBTASK 72-00-00-220-085 Examine the Stage 3 Turbine Blades for Tears

    1. Refer to Figure.

      2. Examine the surface in area A3.1, A3.2, A3.3, A4.1 and A4.2.

        1. Tears

        1. Reject

    7. SUBTASK 72-00-00-220-086 Examine the Stage 3 Turbine Blades for Bends

    1. Refer to Figure.

      2. Examine the surface in area A4.1 and A4.2.

        1. One bend on each blade (on a maximum of 10 blades) if the maximum distortion is less than 0.020 in. (0.50 mm) and the maximum length of the distortion is less than five percent of the trailing edge length

        1. Accept

        2. More than in Step

        1. Reject

    8. SUBTASK 72-00-00-220-087 Examine the Stage 3 Turbine Blades for Build-Up of Deposits

      1. Examine the stage 3 turbine blades in any area for build-up of deposits.

        1. Build-up of deposits related with normal engine running

        1. Accept

        2. Other than in Step

        1. Reject

    9. SUBTASK 72-00-00-220-088 Examine the Stage 3 Turbine Blades for Sulphidation/Corrosion/Blistering/Coating Damage

    1. Refer to Figure

      NOTE

      For damaged coating associated with crack, nick or dent refer to Step, Step, and Step.

      2. Examine the surface in area A12.

        1. Dark corrosion, blistering, coating loss or damage

        1. Accept

        2. Single pits in base material or raised pustules

          1. Not more than 0.079 in. (2.00 mm) in diameter or length

          1. Accept

          2. More than in Step

          1. Reject

      3. Examine the surface in area A13.

        1. Dark corrosion or blistering

        1. Accept

        2. Areas of coating loss or damage

          1. Not more than 0.059 in. (1.50 mm) in diameter or length

          1. Accept

          2. More than in (a) but not more than 0.118 in. (3.00 mm) in diameter or length with a minimum separation of 0.118 in. (3.00 mm)

          1. Accept

          3. Other than in Step or Step

          1. Reject

        3. Single pits in base material

          1. Not more than 0.020 in. (0.50 mm) in diameter or length

          1. Accept

          2. More than in Step

          1. Reject

  10. SUBTASK 72-00-00-220-089 Deleted

    11. SUBTASK 72-00-00-220-161 Visually Examine the Stage 3 Blades for Unlatching

    1. Refer to Figure.

      2. NOTE

        Blades are in unlatched condition if the outer shroud interlock between two blades is lost.

        Examine all blades for signs of unlatching.

        1. Unlatched

        1. Reject

    12. SUBTASK 72-00-00-220-001 Visually Examine the Stage 3 Blades for Shingling

    1. Refer to Figure.

      2. Examine the stage 3 turbine blades for shingling

        1. Shingled

        1. Reject

    13. SUBTASK 72-00-00-220-157 Examine the Stage 3 Turbine Vane

    1. Refer to Figure.

      2. NOTE

        This inspection is only applicable for brazed turbine vane clusters.

        NOTE

        Inspection over the whole circumference (360 degree all around) is not required

        Separated cluster bonds

        1. Complete separation of outer shroud cluster bonds

        1. Accept

        2. Separation of inner shroud cluster bonds, each number, total a half of a complete braze joint for each cluster

        1. Accept

        3. More than in Step

        1. Reject

      3. Borescope locating bushing

        1. Separation of bushing braze bond, cracked or missing material at borescope bushing, each number but all within one quadrant of bushing

        1. Accept

        2. More than in Step

        1. Reject

    14. SUBTASK 72-00-00-420-065 Install the Two Blanking Plugs (72-50-10, 01-420) after Borescope Inspection

    1. Refer to Figure.

      2. Install the blanking plugs and the sleeve flanged bushings.

      1. CAUTION

        MAKE SURE THAT THE SLEEVE FLANGED BUSHINGS DO NOT FALL OUT. IF THE PARTS FALL THEY WILL BE DAMAGED.

        Clean the blanking plugs and the sleeve flanged bushings. Refer to TASK 72-50-10-100-000 (CLEANING-000).

      2. Examine the blanking plugs and the sleeve flanged bushings. Refer to TASK 72-50-10-200-000 (INSPECTION/CHECK-000).

      3. Install each sleeve flanged bushing LPT Case And Rotor Assembly(72-50-10,01-400).

        NOTE

        Usually one spacer plate is necessary.

      4. Install each blanking plug together with its applicable spacer plate(s) LPT Case And Rotor Assembly (72-50-10,01-410). The spacer plate makes sure that the blanking plug has continuous surface with the stage 3 vane outer platform. A maximum tolerance of minus 0.024 in. (0.6 mm) against the vane platform is permitted.

      5. WARNING

        DO NOT GET ANTI-SEIZE PASTE ON YOUR SKIN WHEN YOU LUBRICATE THREADS AND ABUTMENT FACES OF NUTS AND BOLTS. WEAR PROTECTIVE GLOVES.

        Apply CoMat 10-129A ANTI-SEIZE PASTE to the four bolts.

      6. Install the four bolts LPT Case And Rotor Assembly (72-50-10,01-430) and torque to 62 to 72 lbfin (7.0 to 8.1 Nm). Safety with CoMat 02-119 LOCKWIRE.

    15. Figure: LPT Borescope Inspection

    LPT Borescope Inspection

    LPT Borescope Inspection

    Figure: Stage 3 Turbine Blades Borescope Inspection

    Stage 3 Turbine Blades Borescope Inspection

    Stage 3 Turbine Blades Borescope Inspection

    Figure: Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Stage 3 Turbine Blades - Borescope Inspection

    Figure: Stage 3 Turbine Blades Borescope Inspection

    Stage 3 Turbine Blades Borescope Inspection

    Figure: Stage 3 Turbine Blades Borescope Inspection

    Stage 3 Turbine Blades Borescope Inspection

    Figure: Stage 3 Turbine Vanes Borescope Inspection

    Stage 3 Turbine Vanes Borescope Inspection

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Remove Task Number reference for repair (CAS-67926-T5D1S7)

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:71984
Enterprise Name:DOW SILICONES CORP
BU Name:DOW SILICONES CORP
Street:2200 W SALZBURG RD
City:MIDLAND
State:MI
Zip Code:48611
Country:UNITED STATES OF AMERICA
Phone Number:1-800-248-2481, 1-989-496-7881, 1-989-496-6000
Fax Number:1-989-496-6731, 1-989-496-5956
Internet:www.dowcorning.com
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Supply Number:CoMat 02-119
Type:sp01
Supply Short Name:CoMat 02-119 LOCKWIRE
Supply Name:CoMat 02-119 LOCKWIRE
Specification Groups:
Doc NumberType
SAE AS9226 Part Number MS-9226-04 (0.032 IN DIA.)
Suppliers:
ManufacturerRemarks
LOCAL
51563
81343
V508V
Manufacturer Code:3CU95
Supply Number:CoMat 10-129A
Type:sp01
Supply Short Name:CoMat 10-129A ANTI-SEIZE PASTE
Supply Name:CoMat 10-129A ANTI-SEIZE PASTE
Specification Groups:
Doc NumberType
MOLYKOTE P-37
Suppliers:
ManufacturerRemarks
3CU95
818U1
Manufacturer Code:0AM53
Tool Number:IAE 6F10408
Tool Name:IAE 6F10408 Borescope