 | GEnx-1B SERVICE BULLETIN - 72-0343 R02 | Revised: 02/06/2018 |
| SB 72-0343 R02 ENGINE - LPT Rotor/Stator Assembly Stages 5-7 (72-56-00) - Stage 6 and Stage 7 Blades Shank Pocket Redesign | Issued: 01/09/2017 | |
| GEnx-1B SERVICE BULLETIN - 72-0343 R02 | Revised: 02/06/2018 |
| SB 72-0343 R02 ENGINE - LPT Rotor/Stator Assembly Stages 5-7 (72-56-00) - Stage 6 and Stage 7 Blades Shank Pocket Redesign | Issued: 01/09/2017 | |
| 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 2 TO SERVICE BULLETIN 72-0343 |
| Revision 2 is issued to update paragraphs 1.A., Effectivity and 2.A., Material - Price and Availability. |
| Revision 1 was issued October 25, 2017. The original was issued January 09, 2017. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64/P1, -1B64/P2, -1B67/P1, -1B67/P2, -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 stage 6 low pressure turbine (LPT) blade (stage 6 blade) P/N 2430M46P02 and stage 7 LPT blade (stage 7 blade) P/N 2430M47P02 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces new stage 6 blade P/N 2430M46P03 and stage 7 blade P/N 2430M47P03 with shank pocket redesign and provides replacement instructions. |
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's convenience or 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 increase the production of parts. |
| (2) | Condition: |
| The old part configuration requires long machining operation to obtain the shank pocket below the platform blades. This is negatively impacting manufacturing lead time and part production process. |
| (3) | Cause: |
| The shank pocket design in old parts is beneficial for the weight of the stage 6 and stage 7 blades but requires consistent machining time and tooling usage, with significant impact on the production of the parts. |
| (4) | Improvement: |
| The new design for a shallower shank pocket will result in more producible stage 6 stage 7 blades, with shorter machining lead time and less tooling usage. |
| (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 increases weight by 6.577 lb (2.983 kg). |
| The stage 6 blade weight increase will be by 3.048 lb (1.383 kg). The stage 7 blade weight increase will be by 3.529 lb (1.600 kg). |
| 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) |
| 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. |
| Old and new configurations of the stage 6 blades are two-way interchangeable, but the minimum number of different stage 6 blade part numbers on the same stage 6 must be two. |
| Old and new configurations of the stage 7 blades are two-way interchangeable, but the minimum number of different stage 7 blade part numbers on the same stage 7 must be two. |
| 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 |
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| Operation Codes RE=Replace RM=Remains |
| Change Codes 2=Two-way interchangeable. 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes B=Old parts will be supplied until all old parts are sold. Deleted |
| D. | Parts Disposition |
| The old parts will be supplied until all parts are sold. |
| Deleted |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal of Stage 6 Blades and Stage 7 Blades |
| (1) | Remove the old stage 6 blades and stage 7 blades (Figure 1). Removal/disassembly instructions have not changed. Refer to the GEnx-1B EM, 72-56-00, DISASSEMBLY 001 - CONFIGURATION 02, 72-00-04, REMOVAL 001, and 72-00-00, SPECIAL PROCEDURE 002 and SPECIAL PROCEDURE 012. |
| B. | Installation of Stage 6 Blades and Stage 7 Blades |
| (1) | Install the new stage 6 blades and stage 7 blades (Figure 1). Installation/assembly instructions have not changed. Refer to the GEnx-1B EM, 72-00-04, ASSEMBLY 001 - CONFIGURATION 01 and CONFIGURATION 02, 72-56-00, ASSEMBLY 001 - CONFIGURATION 02, 72-00-00, SPECIAL PROCEDURE 010 - CONFIGURATION 01 and CONFIGURATION 02, and 72-00-04, INSTALLATION 001. |
