 | GEnx-1B SERVICE BULLETIN - 72-0297 R06 | Revised: 12/17/2019 |
| SB 72-0297 R06 ENGINE - Combustor Diffuser Assembly (72-41-00) - Introduction of Combustion Chamber Assembly P/N 2258M80G10 with Improved Durability Combustor Mixer and Outer Retainer | Issued: 05/09/2016 | |
| 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 (2019) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 6 TO SERVICE BULLETIN 72-0297 |
| Revision 6 is issued to update paragraphs 1., PLANNING INFORMATION and 2., MATERIAL INFORMATION. |
| Revision 5 was issued February 08, 2017. Revision 4 was issued November 17, 2016. Revision 3 was issued September 20, 2016. Revision 2 was issued July 27, 2016. Revision 1 was issued May 31, 2016. The original was issued May 09, 2016. Revision bars in the left margin identify changes. |
| NOTE: |
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| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64/P2, -1B67/P2, -1B70/72/P2, -1B70/75/P2, -1B70C/P2, -1B74/75/P2, -1B76/P2, -1B76A/P2 |
| 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. |
| Deleted. |
| The combustion chamber assembly P/N 2258M80G09, radial mixer P/N 2446M95G01, radial mixer P/N 2446M96G01, outer retainer P/N 2258M91P01, and outer retainer P/N 2258M97P01 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin releases new combustion chamber assembly P/N 2258M80G10 and new radial mixers P/N 2647M53G01 and P/N 2647M54G01 for the PIP2 configuration and gives instructions to rework the old combustion chamber assembly to a new part number. |
| Revision 6 of this Service Bulletin replaces the original MAR-M-509 radial mixers with the latest type design. The new radial mixers P/N 2739M50P02 and P/N 2739M51P02 are made of MAR-M-509 material as single piece casting. |
| C. | Compliance |
| Category 4 |
| GE recommends that you do this Service Bulletin when the combustor diffuser nozzle (CDN) module is exposed. |
| 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 operators fleet. |
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts, improve reliability, and reduce significant events. |
| (2) | Condition: |
| The current configuration of the GEnx-1B PIP2 combustor radial mixers and outer retainers does not meet the high cycle fatigue (HCF) capability requirements related to fuel coupled dynamics. In effect, on some engines the radial mixers develop cracks which lead to earlier engine removals. |
| (3) | Cause: |
| The condition is caused by higher than predicted combustion acoustics, combined with limited material capability of the current radial mixer and outer retainer design. |
| (4) | Improvement: |
| This change provides a more durable radial mixer with improved high-cycle fatigue material properties and an outer retainer with improved wear capability. |
| The as cast radial mixers improve durability when exposed to elevated acoustic levels better than the original L605 radial mixers or MAR-M-509 material parts, which are manufactured using an electro-discharge machining (EDM) process. |
| (5) | Substantiation: |
| Substantiation is by comparative analysis and analysis. |
| 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 |
| The complete compliance with this Service Bulletin decreases weight by 0.193 lb (0.088 kg). |
| I. | References (Use the latest version of these documents) |
| GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| Interchangeable as a set. |
| 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: |
| None. |
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes DE=Delete RE=Replace RI=Reidentify RM=Remains RW=Rework |
| Change Codes 1=One-way interchangeable. |
| Support Codes A=Old parts will no longer be supplied. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General |
| (1) | Disassemble the combustion chamber assembly (Figure 1). Refer to the GEnx-1B CIR, 72-00-42, REPAIR 001. |
| (2) | Replace the radial mixers and outer retainers. Refer to the GEnx-1B CIR, 72-00-42, REPAIR 002. |
| (3) | Assemble the combustion chamber assembly. Refer to the GEnx-1B CIR, 72-00-42, REPAIR 002. |
| (4) | Reidentify the combustion chamber assembly (Figure 1). Refer to the GEnx-1B CIR, 72-00-42, REPAIR 002. |
| B. | Deleted |
