 | GEnx-1B SERVICE BULLETIN - 72-0052 R01 | Revised: 10/04/2023 |
| SB 72-0052 R01 ENGINE - High Pressure Compressor Stator Assembly (72-32-00) - Introduction of New VSV Lever Arm System | Issued: 01/17/2012 | |
| GEnx-1B SERVICE BULLETIN - 72-0052 R01 | Revised: 10/04/2023 |
| SB 72-0052 R01 ENGINE - High Pressure Compressor Stator Assembly (72-32-00) - Introduction of New VSV Lever Arm System | Issued: 01/17/2012 | |
| 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 72-0052 |
| Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS. |
| The original was issued January 17, 2012. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
|
| 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. |
| B. | Description |
| This Service Bulletin provides assembly procedures and releases new HPC stage 1 to 4 variable stator vanes (VSV) P/Ns D431P02, D432P02, D433P02, and D434P02, new sleeves P/Ns 2373M20P01 (stage 1 to 3), 2373M20P02 (stage 4), ring lever arms P/Ns 2373M22G01 (stage 1), 2373M22G02 (stage 2), 2373M22G03 (stage 3), and 2373M22G04 (stage 4), bridge lever arms P/N 2322M22G05 (stage 1 to 4), ring segments P/Ns 2327M11G04, 2321M91G04 (stage 1), 2321M92G04 (stage 2), 2321M93G04 (stage 3), and 2321M94G04, 2327M12G04 (stage 4), and bridges P/Ns 2322M11P02, 2327M14P02 (stage 1), 2322M12P02 (stage 2), 2322M13P02 (stage 3), and 2322M14P02 , 2327M15P02 (stage 4). |
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's option. |
| Impact E |
| This recommendation is to improve the cost of ownership, reduce maintenance requirements or is a product improvement. |
| NOTE: |
|
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts, improve maintainability, and reduce weight. |
| (2) | Condition: |
| The current lever arm system uses three different lever arm designs for the four stages of the VSV system. The shape of these designs was found to make these arms heavier than necessary. In addition, the current actuation ring designs have a thin extension feature on both ends (at the horizontal split flange) which made tooling access to one of the split line bolts difficult. |
| (3) | Cause: |
| The current configuration lever arms and actuation rings had not been evaluated for possible part design simplification. |
| (4) | Improvement: |
| The new lever arm design has been simplified so that the lever arm shape is consistent for all four stages and it is lighter than the current lever arm designs. The new actuation rings remove the thin extension feature on both ends to allow tool access to split line bolt and reduce weight. |
| (5) | Substantiation: |
| Substantiation is by analysis, comparative analysis, and test. |
| F. | Approval |
| This Service Bulletin has been reviewed by the FAA and the repair(s) and modification(s) herein comply with the applicable Federal Aviation Regulations and are FAA 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 4.0 lb (1.8 kg). |
| I. | References (Use the latest version of these documents) |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| Deleted |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| NOTE: |
|
| J. | Publications Affected |
| Deleted |
| Deleted |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| The entire set of hardware for each stage must be changed at the same time. Vanes, lever arms, actuation rings, spacers, and bridges for an entire stage must be changed at the same time. |
| Complete stage sets of the old and new vanes, lever arms, actuation rings, spacers, and bridges can be installed on the same HPC forward case assembly. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
|
| NOTE: |
|
| NOTE: |
|
| (2) | Other Spare Parts: |
|
| NOTE: |
|
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes AD=Add DE=Delete RE=Replace RM=Remains |
| Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes B=Old parts will be supplied until all old parts are sold. C=Old parts will be supplied until 2017. E=Old parts will be supplied, and can be used at other engine locations. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| E. | Tooling - Price and Availability |
| Deleted. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | VSV Lever Arm System Disassembly |
| (1) | Disassembly instructions for the VSV lever arm system (Figure 1) have not changed. Refer to the GEnx-1B EM, 72-32-00, DISASSEMBLY 001. |
| B. | New VSV Lever Arm System Assembly |
| (1) | Assembly instructions for the VSV lever arm system (Figure 1) have not changed. Refer to the GEnx-1B EM, 72-32-00, ASSEMBLY 001, CONFIG 01. |
