 | GEnx-1B SERVICE BULLETIN - 73-0074 R00 | Revised: 12/20/2018 |
| SB 73-0074 R00 ENGINE FUEL AND CONTROL - General (73-00-00) - Electrical Clip Insert Elimination and Introduction of New Harnesses Support Parts | Issued: 12/20/2018 | |
| GEnx-1B SERVICE BULLETIN - 73-0074 R00 | Revised: 12/20/2018 |
| SB 73-0074 R00 ENGINE FUEL AND CONTROL - General (73-00-00) - Electrical Clip Insert Elimination and Introduction of New Harnesses Support Parts | Issued: 12/20/2018 | |
| 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. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64/P2, -1B67/P2, -1B70/75/P2, -1B70/P2, -1B70C/P2, -1B74/75/P2, -1B76/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 electrical clip inserts (clip inserts) P/N 1793M46P03, P/N 1793M46P05, and P/N 1793M46P06, aft skirt segment heat shields (heat shields) P/N 2403M48G01 and P/N 2403M49G01, drain support bracket P/N 2654M16G01, support bracket P/N 2654M22G01, cushioned loop clamp (loop clamp) P/N J1432P11, and accessory gearbox module assembly P/N 2305M70G09 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin eliminates 10 clip inserts from the harness support spring clip locations and releases new harness support hardware to improve the routing and integration. |
| 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 |
| Do GEnx-1B S/B 73-0073 when you do this Service Bulletin. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts and remove parts from service. |
| (2) | Condition: |
| The clip inserts were introduced as a response to customer concerns on poor routing experience for legacy sustaining programs. |
| (3) | Cause: |
| Successful field harness experience across engine programs has demonstrated that the harness peek overbraid at the spring clips performs its chafe guard purpose when properly integrated with spring clips. |
| (4) | Improvement: |
| The clip insert elimination leads to assembly process simplification through reduced parts count, improves field shop operations, eliminates potential foreign object damage (FOD) concerns, and resolves special considerations to abate clip insert damage and proliferation by error-proofing maintenance activity. |
| To enable the clip insert elimination, two harness bracket supports are being updated to downsize nine spring clips, and two loop clamps are released at the heat shield to improve support integration for the W32 and W33 harnesses. |
| (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 |
| 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) |
| GEnx-1B S/B 73-0073, ENGINE FUEL AND CONTROL - General (73-00-00) - Electrical Clip Insert Elimination |
| 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 configuration hardware must be introduced 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: |
|
| *Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase. |
| NP = Not Provisioned |
| NOTE: |
|
| (2) | Other Spare Parts: |
|
| NOTE: |
|
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
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| Operation Codes AD=Add DE=Delete RE=Replace QTC=Quantity Change 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. D=Old parts will be supplied for engines that have not been changed by this Service Bulletin. E=Old parts will be supplied, and can be used at other engine locations. |
| D. | Parts Disposition |
| Discard old parts. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General |
| (1) | Refer to the GEnx-1B EM, 72-00-00, ASSEMBLY 001. |