 | GEnx-1B SERVICE BULLETIN - 72-0319 R03 | Revised: 04/13/2018 |
| SB 72-0319 R03 ENGINE - Mid Fan Shaft Assembly (72-58-00) - Introduction of New Anticorrosion Coating on Mid Fan Shaft in Field and Segregation of Normal LCF Shaft from Reduced LCF Shaft | Issued: 09/20/2016 | |
| 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 (2018) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 3 TO SERVICE BULLETIN 72-0319 |
| Revision 3 is issued to update paragraph 5., APPENDIX B. |
| Revision 2 was issued November 29, 2017. Revision 1 was issued September 22, 2017. The original was issued September 20, 2016. Revision bars in the left margin identify changes. |
| 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: |
| • |
|
| These serial numbers are the best available data. |
| The mid fan shafts P/N 2331M20G03, P/N 2332M81G03, and P/N 2332M81G04 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin provides rework instructions to introduce new mid fan shafts P/N 2440M20G05, P/N 2440M91G05, and alternate P/N 2440M91G06 with new anticorrosion coating on the inner diameter (ID) and aft cone surface with remarking process to segregate the normal low cycle fatigue (LCF) shaft from reduced LCF shaft. |
| C. | Compliance |
| Category 4 |
| GE recommends that you do this Service Bulletin when the mid fan shaft module assembly is exposed, including the quick-turn engines. The mid fan shaft is to be exposed when the low pressure turbine (LPT) module is separated from the engine. |
| Impact E |
| This recommendation is to improve the cost of ownership, reduce maintenance requirements or is a product improvement. |
| 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 improve reliability and maintainability. |
| (2) | Condition: |
| Heavy corrosion pitting is observed on the mid fan shaft inner surface. |
| Normal LCF and reduced LCF life materials are mixed in the field mid fan shafts P/N 2332M81G03 and P/N 2332M81G04. |
| (3) | Cause: |
| Oil leakage into the mid fan shaft ID has been observed on GEnx-1B engines in the field. The oil leakage causes corrosion pits on the mid fan shaft inner surfaces. |
| Reduced LCF values resulted from thin plate-like Aluminum Nitride (ALN) particles caused by high homogenization temperature. |
| (4) | Improvement: |
| The corrosion resistance of the mid fan shaft ID can be improved with the new anticorrosion coating to decrease the number of mid fan shafts that can need a repair during overhaul. |
| The normal LCF and reduced LCF mid fan shafts can be segregated in service by marking them to reduce the number of mid fan shafts that need a repair operation. Both, coating application and segregation action with reidentification are done during the rework process. |
| (5) | Substantiation: |
| Substantiation is by comparative analysis. |
| 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) |
| GEnx-1B S/B 72-0300, ENGINE - Mid Fan Shaft Assembly (72-58-00) - Introduction of New Mid Fan Shaft P/N 2332M81G05 with New Anticorrosion Coating |
| Repair Document (RD) 810-333 (P1 or higher), Low Pressure Mid Shaft Assembly - Mid Fan Shaft - Alteration - Seal Coat Application |
| NOTE: |
|
| J. | Publications Affected |
| 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) |
| K. | Interchangeability |
| The reworked mid fan shaft is fully interchangeable with the old mid fan shaft. After rework, the part number and life limit of the mid fan shaft will change. Refer to the GEnx-1B EM, Chapter 05 for mid fan shafts P/N 2440M20G05 and P/N 2440M91G05 or alternate P/N 2440M91G06 life limits. |
| 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: |
|
| *This Service Bulletin provides rework instructions of the mid fan shaft localized in the field only. If a new mid fan shaft is required, refer to the GEnx-1B S/B 72-0300 and order the mid fan shaft P/N 2332M81G05. |
| NOTE: |
|
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| *The mid fan shafts P/N 2332M81G03 and/or P/N 2332M81G04 with serial number(s) listed in paragraph 4., APPENDIX A must be reworked/reidentified to mid fan shaft P/N 2440M91G05. |
| **The mid fan shafts P/N 2332M81G03 with serial number(s) not listed in paragraph 4., APPENDIX A must be reworked/reidentified to mid fan shaft P/N 2440M91G06. |
| ***The mid fan shafts P/N 2332M81G04 with serial number(s) listed in paragraph 5., APPENDIX B must be reworked/reidentified to mid fan shaft P/N 2440M91G06. |
| Operation Codes RI=Reidentify RM=Remains RW=Rework |
| Change Codes 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| 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) | Remove the old mid fan shaft (1, Figure 1). Refer to the GEnx-1B EM, 72-58-00, DISASSEMBLY 001, CONFIG 01 or CONFIG 02. |
| (2) | Alternative Procedure Available. If necessary, replace the old fan mid shaft (1, Figure 1) with a new fan mid shaft (1) post-GEnx-1B S/B 72-0300. Refer to Other Spare Parts section of paragraph 2.A., Material - Price and Availability. |
| (3) | Alternative Procedure. Rework as follows: |
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| (a) | Rework and reidentify the old mid fan shaft (1, Figure 1). Refer to RD 810-333. |
| (4) | Install the reworked mid fan shaft (1, Figure 1). Refer to the GEnx-1B EM, 72-58-00, ASSEMBLY 001, CONFIG 01 or CONFIG 02. |
| 4. | APPENDIX A - MID FAN SHAFT SERIAL NUMBERS LIST |
| The mid fan shafts P/N 2332M81G03 and/or P/N 2332M81G04 with serial number(s) listed below must be reworked/reidentified to the mid fan shaft P/N 2440M91G05. |
| NOTE: |
|
| Deleted |
|
| 5. | APPENDIX B - MID FAN SHAFT SERIAL NUMBERS LIST |
| The mid fan shaft P/N 2332M81G04 with serial number(s) listed below must be reworked/reidentified to mid fan shaft P/N 2440M91G06. |
|
