 | GEnx-1B SERVICE BULLETIN - 72-0379 R01 | Revised: 06/26/2019 |
| SB 72-0379 R01 ENGINE - Compressor Module Assembly to Combustor Diffuser Nozzle Assembly (72-00-02) - Rework of CDN Assembly, Stage 1 Nozzles, and HPT Support Nozzle for PIP 2 Engines | Issued: 01/05/2018 | |
| 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 1 TO SERVICE BULLETIN 72-0379 |
| Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION and 2., MATERIAL INFORMATION. |
| The original was issued January 05 , 2018. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64/P2, -1B67/P2, -1B70/75/P2, -1B70/P2, -1B70C/P2, -1B74/75/P2, -1B76/P2, -1B76A/P2 |
| This Service Bulletin is applicable to all GEnx-1B PIP 2 engines. |
| The parts listed in Table 1 below are affected by this Service Bulletin: |
|
| B. | Description |
| This Service Bulletin provides instructions to rework the stage 1 HPT stator nozzles (stage 1 nozzles) P/N 2482M59G03 into P/N 2009M48G03 and P/N 2482M59G04 into P/N 2009M48G04, HPT support nozzle P/N 2407M46G06 into P/N 2407M46G08, and replacement of bolt cover P/N 2447M11P01 with P/N 2756M11P02. |
| 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 a new configuration of parts by rework/replacement with improved reliability. |
| (2) | Condition: |
| The current configuration of the HPT support nozzle has experienced microcracks on the outside diameter (OD) of the aft flange. This condition has resulted in early part replacement. |
| (3) | Cause: |
| The current HPT support nozzle condition is caused by hot gas ingestion around the OD of the aft flange. |
| (4) | Improvement: |
| The new bolt cover has a forward arm extension to better protect the HPT support nozzle aft flange OD, extended tabs, and ship-lap feature to provide a 360-degree protection to the HPT support nozzle. In addition, to make room for the arm extension, the aft flange OD was reduced and a wider chamfer was added to the HPT support nozzle. An additional grind is added to the stage 1 nozzles aft inner band to interface with the new HPT support nozzle and bolt cover during assembly. |
| (5) | Substantiation: |
| Substantiation is by analysis, comparative analysis, and test. |
| 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 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 72-0380, ENGINE - Compressor Module Assembly to Combustor Diffuser Nozzle Assembly (72-00-02) - Introduction of New CDN Assembly with Improved Stage 1 Nozzles, HPT Support Nozzle, and Bolt Cover for PIP2 Engines |
| GEnx-1B S/B 72-0383, ENGINE - Combustor Diffuser Nozzle Assembly (72-40-00) - Introduction of New Combustor Diffuser Assembly and Subparts |
| GEnx-1B S/B 73-0060, ENGINE FUEL AND CONTROL - General (73-00-00) - Introduction of Redesigned W30 Harness, W31 Harness, and Support Brackets |
| Repair Document (RD) 170-1138 (L1 or higher), High Pressure Turbine Stage 1 Nozzle Assembly - HPT Stage 1 Nozzle Support - Alteration - Aft Flange Machining |
| Repair Document (RD) 172-386 (P1 or higher), High Pressure Turbine Stage 1 Nozzle Assembly - High Pressure Turbine Stator Stage 1 Nozzles - Alteration - Inner Platform Machining |
| NOTE: |
|
| 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 |
| Qualified interchangeability. |
| The HPT support nozzle P/N 2407M46G08 requires the reworked stage 1 nozzles P/N 2009M48G03 and P/N 2009M48G04 or the post-GEnx-1B S/B 72-0380 stage 1 nozzles P/N 2764M24G03 and P/N 2764M24G04, which can be intermixed within the set. The new bolt cover P/N 2756M11P02 is also required. These parts are one-way interchangeable with the parts they replace. |
| The reworked stage 1 nozzles P/N 2009M48G03 and P/N 2009M48G04 cannot be used on engines that contain the post-GEnx-1B S/B 72-0383 combustion chamber assembly P/N 2745M50G01. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
|
| NOTE: |
|
| (2) | Other Spare Parts: |
|
| NOTE: |
|
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| NOTE: |
|
| Operation Codes RE=Replace RM=Remains RW=Rework |
| Change Codes 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes C=Old parts will be supplied until August, 2018. D=Old parts will be supplied for engines that have not been changed by this Service Bulletin. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| Rework. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Disassembly |
| (1) | Disassemble the CDN assembly to get access to the stage 1 nozzle assembly. Disassembly instructions have not changed. Refer to the GEnx-1B EM, 72-40-00, DISASSEMBLY 001. |
| (2) | Disassemble the stage 1 nozzle assembly to get access to the HPT support nozzle (1, Figure 1) and stage 1 nozzles (2 and 3). Disassembly instructions have not changed. Refer to the GEnx-1B EM, 72-51-00, DISASSEMBLY 001. |
| B. | Rework |
| (1) | Rework the HPT support nozzle (1, Figure 1). Refer to RD 170-1138 and do as follows: |
| (a) | Reidentify as specified in RD 170-1138. |
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| (2) | Rework the stage 1 nozzles (2 and 3). Refer to RD 172-386 and do as follows: |
| (a) | Reidentify as specified in RD 172-386. |
| C. | Assembly |
| (1) | Assemble the stage 1 nozzle assembly with the HPT support nozzle (1, Figure 1) and stage 1 nozzles (2 and 3). Assembly instructions have not changed. Refer to the GEnx-1B EM, 72-51-00, ASSEMBLY 001, CONFIG 02. |
| (2) | Assemble the CDN assembly with the stage 1 nozzle assembly and new bolt covers (4, Figure 1). Assembly instructions have not changed. Refer to the GEnx-1B EM, 72-40-00, ASSEMBLY 001, CONFIG 02. |
