 | GEnx-1B SERVICE BULLETIN - 74-0003 R01 | Revised: 03/12/2015 |
| SB 74-0003 R01 IGNITION - Ignition Exciters (74-11-10) - Release of Exciter Box Base with New Isolators | Issued: 05/02/2014 | |
| GEnx-1B SERVICE BULLETIN - 74-0003 R01 | Revised: 03/12/2015 |
| SB 74-0003 R01 IGNITION - Ignition Exciters (74-11-10) - Release of Exciter Box Base with New Isolators | Issued: 05/02/2014 | |
| 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 (2015) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 1 TO SERVICE BULLETIN 74-0003 |
| Revision 1 is issued to update paragraphs 1.I., References and 2., MATERIAL INFORMATION . |
| The original was issued May 2, 2014. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B54, -1B54/P1, -1B54/P2, -1B58, -1B58/P1, -1B58/P2, -1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/P1, -1B70/P2, -1B70/72/P1, -1B70/72/P2, -1B70/75/P1, -1B70/75/P2, -1B74/75/P1, -1B74/75/P2, -1B75/P1, -1B75/P2, -1B78/P2 |
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
|
| The exciter box base support bracket (exciter bracket) P/N 2343M35G01 and double hexagon head machine bolts (machine bolts) P/N AS3237-26 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces new exciter bracket P/N 2586M20G01 and provides instructions to replace the old part with a new exciter bracket. |
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's convenience. |
| NOTE: |
|
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To improve manufacturing producibility and isolator use standardization. |
| (2) | Condition: |
| The current design requires more manufacturing resources than desired and uses isolators that are not standardized with the other isolators used on the externals hardware. This condition drives up manufacturing time. |
| (3) | Cause: |
| A unique, low volume isolator is used only on the GEnx-1B isolator box. |
| (4) | Improvement: |
| Release design using standard isolator used on other mount locations on the GEnx-1B engine and used on the GEnx-2B isolator base which improves manufacturing producibility of the GEnx-1B exciter base enclosure. |
| (5) | Substantiation: |
| Substantiation is by comparative analysis. |
| 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 0.36 lb (0.2 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 Boeing 787 Aircraft Maintenance Manual (AMM) |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| K. | Interchangeability |
| The new parts introduced by this Service Bulletin, the exciter bracket P/N 2586M20G01 and machine bolts P/N AS3237-22, must be installed as an engine set. Mixing parts of new and old configurations is not allowed. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
|
| *Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase. |
| NP = Not Provisioned |
| NOTE: |
|
| (2) | Other Spare Parts: |
| None. |
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes AD=Add 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. E=Old parts will be supplied and can be used at other locations. |
| D. | Parts Disposition |
| Use serviceable old parts at other engine locations or for engines that have not changed. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | On Wing |
| (1) | Refer to the GEnx-1B Boeing 787 AMM, DMC-B787-A-G73-22-01-00A-520A-A, for removal and DMC-B787-A-G73-22-01-00A-720A-A, for installation. |
| B. | Removal In Shop |
| (1) | Remove the ignition cooling system. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, Subtask 72-00-02-030-401. |
| NOTE: |
|
| (2) | Remove the exciter bracket cover (01-010, 74-11-10) and disconnect the ignition leads from the igniters and ignition exciters. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, Subtask 72-00-02-030-402. |
| (3) | Disconnect the W9 and W10 harnesses from the ignition exciters. Refer to the GEnx-1B EM, 72-00-00, DISASSEMBLY 001, Subtask 72-00-00-030-230 and Subtask 72-00-00-030-231. |
| (4) | Remove the ignition exciters and the old exciter bracket (1, Figure 1). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, Subtask 72-00-02-030-402. |
| C. | Installation in Shop |
| (1) | Install the ignition exciters and the new exciter bracket with new machine bolts (2, Figure 1). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, Subtask 72-00-02-440-157. |
| (2) | Connect back the W9 and W10 harnesses. Refer to the GEnx-1B EM, 72-00-00, ASSEMBLY 001, Subtask 72-00-00-440-012 and Subtask 72-00-00-440-011. |
| (3) | Install the exciter bracket cover (01-010, 74-11-10) and connect the ignition leads to the igniters and the exciter boxes. Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, Subtask 72-00-02-440-157. |
| (4) | Install and connect back the ignition cooling system. Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, Subtask 72-00-02-440-164. |
