 | GEnx-1B SERVICE BULLETIN - 77-0014 R01 | Revised: 10/28/2019 |
| SB 77-0014 R01 ENGINE INDICATING - EGT Harness (77-21-10) - Introduction of New EGT Harnesses | Issued: 07/02/2019 | |
| GEnx-1B SERVICE BULLETIN - 77-0014 R01 | Revised: 10/28/2019 |
| SB 77-0014 R01 ENGINE INDICATING - EGT Harness (77-21-10) - Introduction of New EGT Harnesses | Issued: 07/02/2019 | |
| 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 77-0014 |
| Revision 1 is issued to update paragraph 3., ACCOMPLISHMENT INSTRUCTIONS. |
| The original was issued July 02, 2019. Revision bars in the left margin identify changes. |
| 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, -1B76/P2, -1B76A/P2 |
| 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 exhaust gas temperature (EGT) harnesses VIN 504948-5 (P/N 2121M95P02) and VIN 504949-5 (P/N 2121M96P02) are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces new EGT-A harness VIN 504948-6 (P/N 2737M44P01) and EGT-B harness VIN 504949-6 (P/N 2737M45P01) with durability improvements. |
| C. | Compliance |
| Category 6 |
| GE recommends that you do this Service Bulletin when the EGT harnesses are routed for repair. |
| Impact E |
| This recommendation is to improve the cost of ownership, reduce maintenance requirements or is a product improvement. |
| NOTE: |
|
| This Service Bulletin is offered to improve the reliability or performance of your GE product, or to help prevent the occurrence of the event or condition described in this Service Bulletin. If the operator elects not to participate in the bulletin, that decision will be taken into consideration by GE in evaluating future product performance issues that may arise in the operators fleet. |
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts and improve reliability. |
| (2) | Condition: |
| The EGT harnesses experience damage in the terminal lugs and metal braid of the pigtails. |
| (3) | Cause: |
| The current EGT harnesses include thin terminal lugs that are easily damaged during operation or maintenance and harness pigtails with excess slack that are damaged due to chafing or flexing. |
| (4) | Improvement: |
| The new EGT-A harness and EGT-B harness include improved routing, reinforced EGT terminal lugs with improved crimping, and back braiding of the harness pigtail breakouts. |
| (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 |
| After you get access to the EGT harnesses, you will need approximately 2 man-hours for each engine or component. |
| H. | Weight and Balance |
| Weight and balance are not changed. |
| I. | References (Use the latest version of these documents) |
| GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM) |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| GEK 114047, Component Maintenance Manual (CMM), 73-31-01 |
| NOTE: |
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| J. | Publications Affected |
| GEnx-1B, Boeing 787 Aircraft Maintenance Manual (AMM) |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| GEK 114047, GEnx-1B Component Maintenance Manual (CMM), 73-31-01 |
| K. | Interchangeability |
| Two-way interchangeable. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
|
| NP = Not Provisioned |
| NOTE: |
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| *Part not supplied by GE Engine Services Distribution L.L.C. To procure parts, contact the following: |
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| (2) | Other Spare Parts: |
| None. |
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| GE-Unison is pleased to provide industry support for compliance, outlined as follows: |
| (1) | Material Support: |
| (a) | GE-Unison is pleased to extend a special discounted pricing for the spare kit P/N K530179. The spare kit consists of one EGT-A harness and one EGT-B harness. |
| Please contact Unison or Unison's authorized distributor for quote and details on discounted pricing and delivery. This pricing program will expire 36 months after the original release date of this Service Bulletin. |
| Unison regional sales director contact information: |
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| Authorized aviation distribution contact information: |
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| C. | Configuration Chart |
|
| Operation Codes RE=Replace RM=Remains |
| Change Codes 2=Two-way interchangeable. |
| Support Codes B=Old parts will be supplied until all old parts are sold. |
| D. | Parts Disposition |
| Discard old parts. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General |
| (1) | Remove the old EGT harnesses as specified in the GEnx-1B EM or GEnx-1B, Boeing 787 AMM. The installation instructions have some modifications to clarify the orientation of the terminals attached to the EGT probes. These details are specified in the updated installation instructions in the GEnx-1B EM and GEnx-1B, Boeing 787 AMM. |
| B. | In-Shop Instructions |
| (1) | Remove the old EGT harnesses (1 and 2, Figure 1). Removal instructions have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002, CONFIG 01 or CONFIG 02. |
| (2) | Install the new EGT-A harness (1, Figure 1) and EGT-B harness (2). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 005, CONFIG 01 or CONFIG 02 (Post-GEnx-1B S/B 77-0014 configuration). |
| NOTE: |
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| C. | On-Wing Instructions |
| (1) | Remove the old EGT harness (1, Figure 1). Removal instructions have not changed. Refer to the GEnx-1B, Boeing 787 AMM, 77-21-04, TASK B787-A-G77-21-04-00A-520A-A. |
| (2) | Remove the old EGT harness (2, Figure 1). Removal instructions have not changed. Refer to the GEnx-1B, Boeing 787 AMM, 77-21-05, TASK B787-A-G77-21-05-00A-520A-A. |
| (3) | Install the new EGT-A harness (1, Figure 1). Refer to the GEnx-1B, Boeing 787 AMM, 77-21-04, TASK B787-A-G77-21-04-00A-720A-A (Post-GEnx-1B S/B 77-0014 configuration). |
| NOTE: |
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| (4) | Install the new EGT-B harness (2, Figure 1). Refer to the GEnx-1B, Boeing 787 AMM, 77-21-05, TASK B787-A-G77-21-05-00A-720A-A (Post-GEnx-1B S/B 77-0014 configuration). |
| NOTE: |
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