TASK 72-00-00-200-007 Engine General - Examine The LPT Stage 7 Blades And Vanes, Inspection-007

DMC:V2500-A0-72-00-0000-07A-300A-B|Issue No:003.00|Issue Date:2017-08-01

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 72-00-00-200-007 Engine General - Examine The LPT Stage 7 Blades And Vanes, Inspection-007

General

This TASK gives the procedure for the inspection of the stage 7 turbine blade and vanes. For the stage 3 turbine blades and vanes borescope inspection refer to TASK 72-00-00-200-006 (INSPECTION/CHECK-006).

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

The practices and processes referred to in the procedure by the TASK numbers are in the SPM.

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.

If you find items which are not acceptable for more engine running, the LP turbine module must be send for refurbishment. Carry out a piece part inspection and the relevant items repaired as required.

Insert lamp through engine exhaust and examine stage 7 blades and vanes to the extent possible.

The nature of damage to the LP turbine blades can be difficult to recognise with a lamp and thus extent of defects is only estimated. Thus inspections carry out only by experienced personnel.

If not possible to identify the nature or extent of damage more investigation is required to pinpoint cause and acceptability.

References

Refer to the SPM for data on these items.

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

Inspection of Parts, TASK 70-20-00-220-501

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

Suface Protection

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Inspection LampLOCALLamp

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-00-00-220-090 Examine the Stage 7 Turbine Blades and Vanes for Deposits

    1. Refer to Figure and Figure.

      2. Examine the stage 7 turbine blades and the stage 7 turbine vanes for deposits.

        1. Deposits caused with normal engine running

        1. Accept

        2. Deposits not caused with normal engine running

        1. Do a borescope inspection, refer to TASK 72-00-00-200-006 (INSPECTION/CHECK-006). If the same deposits are found at stage 3 turbine blades, examine the other parts of the engine, refer to TASK 72-00-00-200-000 (INSPECTION/CHECK-000). If deposits are not found at stage 3, continue with the examination of the LP turbine module

    2. SUBTASK 72-00-00-220-091 Examine the Stage 7 Turbine Blades and Vanes for Erosion

    1. Refer to Figure and Figure.

      2. Examine the airfoil (Area A5), the leading and the trailing edge (Area A2 and A4) for erosion.

        1. Erosion

        1. Reject

    3. SUBTASK 72-00-00-220-092 Examine the Stage 7 Turbine Blades and Vanes for Cracks

    1. Refer to Figure and Figure.

      2. Examine the stage 7 turbine blades and the stage 7 turbine vanes for cracks.

        1. Cracks on the tip and root fillet (Area A1 and A3)

          1. Cracked

          1. Reject

        2. Cracks on the leading and trailing edge (Area A2 and A4)

          1. Cracked

          1. Reject

    4. SUBTASK 72-00-00-220-102 Examine the Stage 7 Turbine Blades and Vanes for Dents

    1. Refer to Figure and Figure.

      2. Examine the parts Areas that are given below for dents.

        1. Dents on the tip and root fillet (Area A1 and A3)

          1. Circular bottom dents of maximum 0.005 in. (0.13 mm) depth

          1. Accept

          2. More than in Step

          1. Reject

        2. Dents on the airfoil (Area A5)

          1. Circular bottom dents of maximum 0.010 in. (0.25 mm) depth

          1. Accept

          2. More than in Step

          1. Reject

        3. Dents on the leading and trailing edge (Area A2 and A4)

          1. Circular bottom dents of maximum 0.005 in. (0.13 mm) depth

          1. Accept

          2. More than in Step

          1. Reject

    5. SUBTASK 72-00-00-220-103 Examine the Stage 7 Turbine Blades and Vanes for Nicks

    1. Refer to Figure and Figure.

      2. Examine the parts Areas that are given below for nicks.

        1. Nicks on the airfoil (Area A5)

          1. Unblended nicks of maximum 0.010 in. (0.25 mm) depth

          1. Accept

          2. More than in Step

          1. Reject

        2. Nicks on the leading and trailing edge (Area A2 and A4)

          1. Unblended nicks of maximum 0.005 in. (0.13 mm) depth

          1. Accept

          2. More than in Step

          1. Reject

    6. SUBTASK 72-00-00-220-104 Examine the Stage 7 Turbine Blades and Vanes for Other Damage

    1. Refer to Figure and Figure.

      2. Examine the parts Area that are given below for other damage.

        1. Other damage on the tip and root fillet (Area A1 and A3)

          1. Other damage than in (A1 and A3)

          1. Reject

    7. Figure: Stage 7 turbine blades - lamp inspection acceptance limits

    Stage 7 turbine blades - lamp inspection acceptance limits

    Figure: Stage 7 turbine vanes - lamp inspection acceptance limits

    Stage 7 turbine vanes - lamp inspection acceptance limits

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial correction

Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Lamp
Tool Name:Inspection Lamp