 | GEnx-1B SERVICE BULLETIN - 72-0380 R01 | Revised: 04/06/2018 |
| SB 72-0380 R01 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 | Issued: 12/05/2017 | |
| 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 1 TO SERVICE BULLETIN 72-0380 |
| Revision 1 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION, and 3., ACCOMPLISHMENT INSTRUCTIONS. |
| The original was issued December 05, 2017. 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, -1B76A/P2 |
| This Service Bulletin is applicable to all GEnx-1B PIP2 engines. |
| 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 parts listed in Table 1 below are affected by this Service Bulletin: |
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| B. | Description |
| This Service Bulletin introduces a new CDN assembly P/N 2376M45G10 with a new stage 1 nozzle assembly P/N 2305M55G08 by releasing a new stage 1 nozzle P/N 2764M24G03, stage 1 nozzle (borescope) P/N 2764M24G04, new or reworked HPT support nozzle P/N 2407M46G08, and a new bolt cover P/N 2756M11P02. |
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's convenience. |
| Impact E |
| This recommendation is to improve the cost of ownership, reduce maintenance requirements or is a product improvement. |
| NOTE: |
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| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new and reworked parts to improve reliability. |
| (2) | Condition: |
| The current configuration of the HPT support nozzle has experienced microcracks on the outside diameter (OD) of the aft flange and the current stage 1 nozzle segments have experienced airfoil distress on the convex surface from burning/oxidation. |
| (3) | Cause: |
| The current HPT support nozzle condition is caused by hot gas ingestion around the OD of the aft flange. The stage 1 nozzle condition is caused by higher operating temperatures and stresses than originally predicted. |
| (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. |
| The stage 1 nozzle aft inner band has also been modified to interface with the new or reworked HPT support nozzle and a new bolt cover during assembly. |
| The stage 1 nozzle cooling holes and pattern are also improved to reduce part temperature. |
| (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 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| Deleted |
| 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 |
| NOTE: |
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| NOTE: |
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| 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 new stage 1 nozzle P/N 2764M24G03 and stage 1 nozzle (borescope) P/N 2764M24G04 require the new or reworked HPT support nozzle P/N 2407M46G08. The new or reworked HPT support nozzle and new stage 1 nozzles require the new bolt cover P/N 2756M11P02. |
| All parts need to be replaced 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: |
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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 RE=Replace RM=Remains RW=Rework |
| Change Codes 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 July 01, 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. |
| Deleted. |
| 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. |
| (a) | Deleted. |
| (2) | Disassemble the stage 1 nozzle assembly to get access to the old 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 and do as follows: |
| (a) | If the old HPT support nozzle (1, Figure 1) is reworked, continue with step 3.B.(1). |
| (b) | If the old HPT support nozzle (1) is replaced, continue with step 3.C.(1). |
| B. | Rework |
| (1) | Rework and reidentify the old HPT support nozzle (1, Figure 1). Refer to RD 170-1138. |
| C. | Assembly |
| (1) | Assemble the new stage 1 nozzle assembly with the new or reworked HPT support nozzle (1, Figure 1) and the new 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 new 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. |
