 | GEnx-1B SERVICE BULLETIN - 72-0294 R00 | Revised: 04/12/2016 |
| SB 72-0294 R00 ENGINE - High Pressure Turbine Stage 1 Nozzle Assembly (72-51-00) - Introduction of New HPT Support Nozzle | Issued: 04/12/2016 | |
| GEnx-1B SERVICE BULLETIN - 72-0294 R00 | Revised: 04/12/2016 |
| SB 72-0294 R00 ENGINE - High Pressure Turbine Stage 1 Nozzle Assembly (72-51-00) - Introduction of New HPT Support Nozzle | Issued: 04/12/2016 | |
| GE PROPRIETARY INFORMATION | |
| The information contained in this document is GE proprietary information and is disclosed in confidence. It is the property of GE and shall not be used, disclosed to others or reproduced without the express written consent of GE, including, but without limitation, it is not to be used in the creation, manufacture, development, or derivation of any repairs, modifications, spare parts, designs, or configuration changes or to obtain FAA or any other government or regulatory approval to do so. If consent is given for reproduction in whole or in part, this notice and the notice set forth on each page of this document shall appear in any such reproduction in whole or in part. | |
| This technical data is considered EAR controlled pursuant to 15 CFR Parts 730-774 respectively. Transfer of this data by any means to a Non-US Person, whether in the United States or abroad, without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.), is strictly prohibited. | |
| Copyright (2016) General Electric Company, U.S.A. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1B70C/P1, -1B70C/P2, -1B74/75/P1, -1B74/75/P2 |
| This Service Bulletin is applicable to these GEnx-1B engines: |
| • |
|
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
|
| These serial numbers are the best available data. |
| The high pressure turbine (HPT) support nozzles P/N 2303M22G03, P/N 2303M22G04, and P/N 2407M46G02 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin provides instructions to rework the affected HPT support nozzles to the new configuration. This Service Bulletin also releases the new or reworked HPT support nozzles P/N 2303M22G05, P/N 2303M22G06, and P/N 2407M46G04. |
| C. | Compliance |
| Category 3 |
| GE recommends that you do this Service Bulletin at the next shop visit of the engine/module. |
| NOTE: |
|
| This Service Bulletin is offered to improve the reliability or performance of your GE product, or to help prevent the occurrence of the event or condition described in this Service Bulletin. If the operator elects not to participate in the bulletin, that decision will be taken into consideration by GE in evaluating future product performance issues that may arise in the operators fleet. |
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts and improve reliability. |
| (2) | Condition: |
| The old HPT stage 1 blades have experienced thermal distress and cracking on the concave and convex areas of the airfoil. This convex cracking has resulted in two in-flight shut down (IFSD) events. |
| (3) | Cause: |
| The higher operating temperatures and stresses than those which were originally predicted led to the thermal distress and cracking. |
| (4) | Improvement: |
| The new HPT support nozzle incorporates bypass holes to increase the flow to the HPT blades for an increased blade durability. |
| Depending on engine operating characteristics and configuration, this Service Bulletin may increase Specific Fuel Consumption (SFC) due to the increased cooling air required for the HPT stage 1 blades by 0.05 percent. |
| (5) | Substantiation: |
| Substantiation is by comparative analysis, analysis, and test. |
| F. | Approval |
| The data contained in this Service Bulletin has been reviewed by the appropriate governmental authority and the repair(s) and modification(s) herein comply with the applicable Aviation Regulations and are APPROVED for installation in the model(s) listed in this Service Bulletin. |
| G. | Manpower |
| No additional man-hours are required to comply with this Service Bulletin. |
| H. | Weight and Balance |
| Weight and balance are not changed. |
| I. | References (Use the latest version of these documents) |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| Repair Document (RD) 170-1087 (P1 or Higher), High Pressure Turbine Stage 1 Nozzle Assembly - High Pressure Turbine Stage 1 Nozzle Support - Alteration - Increase the Cooling Flow of the High Pressure Turbine Stage 1 Nozzle Support |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) |
| K. | Interchangeability |
| In production the HPT support nozzles are one-way interchangeable, in field the HPT support nozzles are two way interchangeable. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
| None. |
| (2) | Other Spare Parts: |
|
| NOTE: |
|
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| Industry Support Available. Contact your Customer Support Manager (CSM). |
| C. | Configuration Chart |
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| Operation Codes RE=Replace RM=Remains RW=Rework |
| Change Codes 1=One-way interchangeable. 2=Two-way interchangeable. |
| Support Codes A=Old parts will no longer be supplied. |
| D. | Parts Disposition |
| Rework. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General |
| (1) | Removal and installation instructions for the HPT support nozzle (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-51-00, DISASSEMBLY 001 and ASSEMBLY 001 (CONFIGURATION 01 or CONFIGURATION 02). |
| B. | Rework |
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| (1) | Rework the HPT support nozzle (1, Figure 1) P/N 2303M22G03 to P/N 2303M22G05, or P/N 2303M22G04 to P/N 2303M22G06, or P/N 2407M46G02 to P/N 2407M46G04. Refer to RD 170-1087. |
