 | GEnx-1B SERVICE BULLETIN - 72-0391 R00 | Revised: 12/05/2017 |
| SB 72-0391 R00 ENGINE - HPT Components (72-00-02) - Introduction of New HPT Stage 2 Nozzle Assembly P/N 2305M56G09 with New HPT Stage 1 Shrouds, Hangers, and Attaching Parts | 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 (2017) General Electric Company, U.S.A. |
| 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, -1B76A/P2 |
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
|
| These serial numbers are the best available data. |
| The high pressure turbine (HPT) stage 2 nozzle assemblies P/N 2305M56G03, P/N 2305M56G05, P/N 2305M56G06, and P/N 2305M56G08, HPT stator stage 1
shroud (shroud) P/N 2100M82P05, HPT stator stage
1 hangers (hangers) P/N 2100M84G03 and P/N 2100M84G04, stage 1 seals (seals) P/N 2100M86P02,
P/N 2100M86P03, P/N 2100M86P06,
P/N 2100M86P07, and P/N 2100M86P08 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin releases a new HPT stage 2 nozzle assembly P/N 2305M56G09, shroud P/N 2100M82P06, hangers P/N 2100M84G05 and P/N 2100M84G06, stage 1 seals P/N 2100M86P09, P/N 2100M86P10, P/N 2100M86P11, P/N 2100M86P12, P/N 2100M86P13, P/N 2100M86P14, and P/N 2100M86P15, HPT stator (HPTS) stage 1 L-seals shroud (seals) P/N 2764M37P01 and P/N 2764M37P02, and external pressure seal (seal) P/N 1710M66P03. |
| 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: |
|
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts and improve reliability. |
| (2) | Condition: |
| The current configuration of the shroud has experienced thermal distress in certain operating conditions. |
| (3) | Cause: |
| The current shroud has insufficient cooling margin. |
| (4) | Improvement: |
| The redesign of the shroud sealing allows cooling flows to be retargeted to areas of distress. |
| (5) | Substantiation: |
| Substantiation is by analysis and comparative 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 0.10 lb (0.05 kg). |
| 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) |
| 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) 170-1133 (P1 or higher), High Pressure Turbine Stage 2 Nozzle Assembly - High Pressure Turbine Stage 1 Shroud Hangers - Alteration - Seal Slot, Cooling Hole, Pin Hole, and Rope Seal Alteration |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| Qualified interchangeability. |
| The new shroud P/N 2100M82P06, hanger P/N 2100M84G06, and corresponding new seals must be installed together in full sets. Physical mistake-proofing is built into the new shroud and hanger interface to avoid assembly with old versions of either hardware. |
| 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 |
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| *These HPT stage 2 nozzle assemblies are assembled with the new hanger, shroud, and seals. |
| Operation Codes AD=Add RE=Replace RM=Remains RW=Rework |
| Change Codes 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes A=Old parts will no longer be supplied. B=Old parts will be supplied until all old parts are sold. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| The current hangers P/N 2100M84G03 and P/N 2100M84G04 can be reworked to the hanger P/N 2100M85G06. Refer to paragraph 3., ACCOMPLISHMENT INSTRUCTIONS. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal |
| (1) | Remove the HPT stage 2 nozzle assembly (1, Figure 1) from the combustor diffuser nozzle (CDN) assembly. Removal instructions have not changed. Refer to the GEnx-1B EM, 72-50-00, DISASSEMBLY 001. |
| B. | Disassembly |
| (1) | Disassemble the HPT stage 2 nozzle assembly (1, Figure 1) and remove the old shrouds (2), hangers (3), and seals (4, 5, 6, and 7). Disassembly instructions have not changed. Refer to the GEnx-1B EM, 72-52-00, DISASSEMBLY 001. |
| C. | Rework |
|
|||||||||||||||||||||||||||||||||||||||||||||||||
| (1) | Rework the hangers. Refer to RD 170-1133. |
| D. | Assembly |
| (1) | Assemble the HPT stage 2 nozzle assembly (1, Figure 1) with the new shrouds (2), new or reworked hangers (3), and new seals (4 through 12). Assembly instructions of the HPT stage 2 nozzle assembly (1) have been updated in the GEnx-1B EM to include post-GEnx-1B S/B 72-0391 condition. Refer to the GEnx-1B EM, 72-52-00, ASSEMBLY 001, CONFIG 01 or CONFIG 02. |
| E. | Installation |
| (1) | Install the HPT stage 2 nozzle assembly (1, Figure 1) on the CDN assembly. Installation instructions have not changed. Refer to the GEnx-1B EM, 72-50-00, ASSEMBLY 001. |
