TASK 72-50-32-200-006-A00 LPT Stage 3 Blade - Examine For Overtemperature, Inspection-006

DMC:V2500-A1-72-50-3203-00A-300A-C|Issue No:002.00|Issue Date:2016-05-01

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

V2500-A1

Common Information

TASK 72-50-32-200-006-A00 LPT Stage 3 Blade - Examine For Overtemperature, Inspection-006

Effectivity

FIG/ITEM PART NO.

01-200

3A0883

01-200

3A2053

01-200

3A2055

01-200

3A2373

General

This TASK gives the procedure for the inspection of the stage 3 turbine blades.

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

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 72-50-32-100-000, (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 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 are contained in this TASK. For more data on these items refer to the SPM.

Chemical Processes

Surface Protection

Repair Facilities

Repair Vendors for Step and Step are listed below.

MTU
AERO ENGINES AG
Dachauer
Strasse 665
80995 Muenchen
Germany

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-50-32-220-170 Examine the Stage 3 Turbine Blades for Overtemperature

      NOTE

      1. Do this inspection if the stage 2 HP turbine blades are rejected for an overtemperature condition.

      2. Before examination of the blade do the hardness test of the stage 3 turbine disk. Refer to TASK 72-50-31-200-005, (INSPECTION/CHECK-005).

      3. Blades that were at temperatures more than the limit of 2000 deg F (1093 deg C) for a short time will cause a change in the alloy microstructure of the blade.

      4. Overtemperature condition, also for short time, changes the structure of the gamma particles, together with a decrease of size and volume percentage. Signs of overtemperature are decrease in volume percentage of the gamma phase and compare the microstructure against a referenced standard.

      NOTE

      Do this inspection only if the hardness test of the stage 3 LP turbine disk shows no decrease of hardness. Refer to TASK 72-50-31-200-005, (INSPECTION/CHECK-005).

      1. Examine one blade for overtemperature by metallurgical analysis. Use the blade with the strongest discoloration.

      1. If the stage 3 turbine disk shows hardness loss, reject complete set of stage 3 turbine blades and vanes and examine the stage 4 turbine blades per TASK 72-50-32-200-007-A00, (INSPECTION/CHECK-007, CONFIG-001), TASK 72-50-32-200-007-B00, (INSPECTION/CHECK-007, CONFIG-002) and TASK 72-50-32-200-007-C00, (INSPECTION/CHECK-007, CONFIG-003)) for overtemperature.

  2. SUBTASK 72-50-32-320-055 Prepare the Stage 3 LP Turbine Blade for Metallurgical Analysis

    NOTE

    To accomplish this SUBTASK utilize Repair Vendors as listed in Repair Facilities.

  3. SUBTASK 72-50-32-220-171 Metallurgical Analysis of the Stage 3 Turbine Blades

    NOTE

    To accomplish this SUBTASK utilize Repair Vendors as listed in Repair Facilities.

    4. SUBTASK 72-50-32-220-172 Reject the Stage 3 Turbine Blades

    1. Reject all stage 3 turbine blades in the engine if the analysis indicates temperature higher than 2000 deg F (1093 deg C) at all locations.

    5. SUBTASK 72-50-32-220-497 Reject the Stage 3 Turbine Vanes

    1. If blade metal temperature exceeded the specified limit of 2000 deg F (1093 deg C), but not more than 2050 deg F (1121 deg C), 3rd stage vanes with the following part numbers must be inspected for cracks as follows:

      PN: 3A0645CL45, 3A0641CL45, 3A1729CL45, 3A1733CL45

      PN: 3A2073CL33, 3A2077CL33

      PN: 3A2243CL33, 3A2245CL33

      PN: 3A2412, 3A2415, 3A2926, 3A2929

      3rd stage vanes with unacceptable cracks have to be rejected.

    2. If blade metal temperature exceeded 2050 deg F (1121 deg C), reject all 3rd stage vanes.

    6. SUBTASK 72-50-32-220-498 Examine the Stage 4 Turbine Blades for Overtemperature

    1. If the stage 3 turbine blades were rejected because of overtemperature, examine the stage 4 turbine blades per TASK 72-50-32-200-007-A00, (INSPECTION/CHECK-007, CONFIG-001), TASK 72-50-32-200-007-B00, (INSPECTION/CHECK-007, CONFIG-002) and TASK 72-50-32-200-007-C00, (INSPECTION/CHECK-007, CONFIG-003) for overtemperature.

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

Editorial change

Change Type:

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