TASK 72-45-31-200-006 HPT Stage 2 Hub Heatshield - Test The Hardness

DMC:V2500-A0-72-45-3102-01A-300A-C|Issue No:001.00|Issue Date:2013-11-01

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 72-45-31-200-006 HPT Stage 2 Hub Heatshield - Test The Hardness

Effectivity

FIG/ITEM PART NO.

01-020

2A2406

01-020

2A1041

General

This TASK gives the procedure for the inspection of the Stage 2 HPT heat shield.

All 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 70-20-01-200-501.

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

References

ASTM E3 Preparation of Metallographic Specimens.

ASTM E92 Standard Test Method for Vickers Hardness Metallic Materials.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NameManufacturerPart Number / IdentificationQuantityRemark
Vickers hardness testerLOCALVickers hardness tester

Consumables, Materials and Expendables

NONE

Spares

NONE

Safety Requirements

NONE

Procedure

    1. SUBTASK 72-45-31-220-125 Visually Examine the Heat Shield for Sign of Thermal Distress

    1. Examine the heat shield for indication of thermal distress, such as plastic deformation (typically out bulging) and/or heat tint.

    2. SUBTASK 72-45-31-220-126 Examine the Metallographic Sections for Thermal Distress

    1. Refer to Figure.

    2. Cut and mount radial - longitudinal metallographic sections through the heat shield from all the areas that show thermal distress. Cut from each of the three locations (one near each end and one near the longitudinal center). Each specimen must be 0.500 in. (12.70 mm) in minimum length

    3. SUBTASK 72-45-31-350-070 Polish the Specimens to a One-micron Diamond Finish

      1. Polish the specimens to get a surface equal to one-micron diamond finish

      1. Use ASTM E3, Table 5 or use an equivalent method

    4. SUBTASK 72-45-31-220-127 Examine the Stage 2 HPT Heat Shield for Hardness

      1. Examine the heat shield for Vickers hardness.

      1. You can use 22 lb (10 kg) load for measure of Vickers hardness (HV) for each metallographic sections. Make a minimum of five hardness measurements for each section. Hardness indentations must be centered on the sections thickness and approximately equal distance apart over the section's length

      2. If the Vickers hardness is equal to or less than HV 344, then it indicates that the part was exposed to more than 1500 deg F (815.55 deg C) and that an oil fire might have occurred.

      3. If the Vickers hardness is equal to or less than HV 344, then discard the Stage 1 HPT inner air seal HPT Stage 1 Rotating Inner Air Seal And Damper (72-45-13,01-020), the Stage 1 outer air seal ENGINE-STAGE 1 HPT AIR SEAL (OUTER) (72-45-12,01-040), the Stage 2 HPT air seal HP Turbine (HPT) Rotor And Stator Assembly (72-45-00,01-080), Stage 1 HPT hub HPT Stage 1 Hub (72-45-11,01-010) or HPT Stage 1 Hub (72-45-11,01-011), Stage 2 HPT hub ENGINE-STAGE 2 TURBINE HUB (72-45-31,01-011) and Stage 2 retaining plate HPT Stage 2 Blade Retaining Plate And Related Parts (72-45-33,01-020) and replace with new parts

    5. Figure: Stage 2 HPT Heat Shield - Hardness Check

    Stage 2 HPT Heat Shield - Hardness Check

Requirements After Job Completion

Follow-On Conditions

NONE
Manufacturer Code:LOCAL
Enterprise Name:LOCALLY SUPPLIED
Manufacturer Code:LOCAL
Tool Number:Vickers hardness tester
Tool Name:Vickers hardness tester