 | GEnx-1B SERVICE BULLETIN - 72-0517 R01 | Revised: 06/19/2023 |
| SB 72-0517 R01 ENGINE - Combustor Diffuser Assembly (72-41-00) - In-Shop Introduction of New Combustor Case Free-Running Key Locked Insert | Issued: 02/28/2023 | |
| GEnx-1B SERVICE BULLETIN - 72-0517 R01 | Revised: 06/19/2023 |
| SB 72-0517 R01 ENGINE - Combustor Diffuser Assembly (72-41-00) - In-Shop Introduction of New Combustor Case Free-Running Key Locked Insert | Issued: 02/28/2023 | |
| GE Designated: -CONFIDENTIAL- | |
| 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 part. | |
| This technical data is considered subject to the Export Administration Regulations (EAR) pursuant to 15 CFR Parts 730-774. Transfer of this data by any means to a Non-U.S. 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 (2023) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 1 TO SERVICE BULLETIN 72-0517 |
| Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS. |
| The original was issued February 28, 2023. 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, -1B76/P2, -1B76A/P2 |
| This Service Bulletin is applicable to these GEnx-1B engines: |
| • |
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| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
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| These serial numbers are the best available data. |
| The combustor case P/N 2303M23G23 with key locked Inconel 718 self-locking screw thread insert (key locked insert) P/N J1466P04 is affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces a new combustor case P/N 2303M23G25 with new free-running key locked inco718 screw thread inserts (free-running key locked insert) P/N J1500P104. |
| This Service Bulletin also allows field rework of the affected combustor cases post-GEnx-1B S/B 72-0366 by the replacement of the old key locked insert with the new type of free-running key locked insert P/N J1500P104. |
| C. | Compliance |
| Category 3 |
| GE recommends that you do this Service Bulletin at the next shop visit of the engine/module. |
| Impact C |
| This recommendation is to address a condition that may result in a Non-Event operational disruption, Unscheduled Engine Removals (UER), Out-Station-Removals or Aircraft on the Ground (AOG). |
| 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 operator’s fleet. |
| D. | Concurrent Requirements |
| Do GEnx-1B S/B 73-0103 when you do this Service Bulletin. |
|
| E. | Reason |
| (1) | Objective: |
| To introduce new parts, rework parts, improve reliability, and improve maintainability. |
| (2) | Condition: |
| The current key locked insert may cause the machine bolt to get seized. The seized machine bolt can be damaged during the removal. |
| (3) | Cause: |
| The current key locked insert failures are caused by a high initial running torque on the assembly and seizure on the disassembly. |
| (4) | Improvement: |
| The new type design free-running key locked insert have no self-locking feature. The new type design improves overall the fuel nozzle and igniter adapter bolted joint capability. The new free-running key locked insert lower the potential of getting the machine bolt seized, damaged, or broken. |
| (5) | Substantiation: |
| Substantiation is by analysis, comparative analysis, test, and fleet experience. |
| F. | Approval |
| The data contained in this Service Bulletin has been reviewed by the FAA or authorized entity representing the FAA 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 9250, Commercial Engine Standard Practices Manual (SPM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| GEnx-1B S/B 72-0366, ENGINE - Combustor Diffuser Assembly (72-41-00) - Introduction of New Combustor Case P/N 2303M23G23 with Improved Inconel 718 Thread Inserts |
| GEnx-1B S/B 73-0103, ENGINE FUEL AND CONTROL - Fuel Injection Nozzles (73-11-30) - In-Shop Fuel Nozzle Machine Bolt Replacement with Safety Cable Installation |
| GEnx-1B Temporary Revision (TR) 05-0115, Static Structures - Life Limits |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| Qualified interchangeability. |
| The new combustor case P/N 2303M23G25 has free-running key locked inco718 screw thread inserts P/N J1500P104 from production and requires installation of machine bolts with safety cable/wire released per GEnx-1B S/B 73-0103. Refer to paragraph 1.D., Concurrent Requirements. |
| The old combustor case P/N 2303M23G23 and the new combustor case P/N 2303M23G25 are two-way interchangeable with mandatory installation of machine bolts with safety cable/wire released per GEnx-1B S/B 73-0103 . Refer to paragraph 1.D., Concurrent Requirements. |
| The old key locked Inconel 718 self-locking screw thread inserts P/N J1466P04 and the new free-running key locked inco 718 screw thread inserts P/N J1500P104 are not interchangeable within combustor case P/N 2303M23G25. |
| The combustor case P/N 2303M23G23 with old key locked Inconel 718 self-locking screw thread inserts P/N J1466P04 can be reworked to the combustor case P/N 2303M23G23 with new free-running key locked inco 718 screw thread inserts P/N J1500P104. As part of field rework, the entire set of old key-locked inserts P/N J1466P04 is replaced with the new free-running key locked insert P/N J1500P104 and combustor case P/N 2303M23G23 remains unchanged. The new free-running key locked inco 718 screw thread inserts P/N J1500P104 require installation of machine bolts with safety cable/wire released per GEnx-1B S/B 73-0103 . Refer to paragraph 1.D., Concurrent Requirements. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
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| NOTE: |
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| (2) | Other Spare Parts: |
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| NOTE: |
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| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
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| Operation Codes AD=Add RE=Replace RM=Remains |
| Change Codes 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes None. |
| D. | Parts Disposition |
| Discard old parts. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Post-GEnx-1B S/B 72-0366 Fuel Nozzle and Igniter Adapter Pads Key Locked Insert Replacement |
| (1) | Remove the fuel nozzles and igniter plug adapters from the combustor diffuser assembly (Figure 1) as necessary. Disassembly instructions have not changed. Refer to the GEnx-1B EM, 72-41-00, DISASSEMBLY 001. |
| (2) | Remove the entire set of old key locked inserts (1, Figure 2) from the combustor case fuel nozzle and igniter adapter pads. Removal instructions have not changed. Refer to the SPM, TASK 70-48-11, INSTALLATION OF KEY-LOCKED INSERTS. |
| (3) | Install the new free-running key locked insert (1, Figure 2) on the combustor case fuel nozzle and igniter adapter pads. Installation instructions have not changed. Refer to the SPM, 70-48-11, INSTALLATION OF KEY-LOCKED INSERTS. |
