 | GEnx-1B SERVICE BULLETIN - 72-0285 R00 | Revised: 01/06/2016 |
| SB 72-0285 R00 ENGINE - Combustor Diffuser Nozzle Assembly (72-40-00) - Introduction of New FINS Nut Shield P/N 2303M28P02 | Issued: 01/06/2016 | |
| GEnx-1B SERVICE BULLETIN - 72-0285 R00 | Revised: 01/06/2016 |
| SB 72-0285 R00 ENGINE - Combustor Diffuser Nozzle Assembly (72-40-00) - Introduction of New FINS Nut Shield P/N 2303M28P02 | Issued: 01/06/2016 | |
| 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 (2016) 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 |
| The following engine serial numbers (ESNs) were originally built with the forward inner nozzle support (FINS) nut shields P/N 2303M28P01 and P/N 2303M28P02, and should be replaced for serviceability issues only: |
| • |
|
| The current FINS nut shields P/N 2445M58P01 and P/N 2445M58P02 that must be replaced, were used in the following engines: |
| • |
|
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
|
| These serial numbers are the best available data. |
| The FINS nut shields P/N 2445M58P01 and P/N 2445M58P02 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces new FINS nut shield P/N 2303M28P02 and alternate FINS nut shield P/N 2303M28P01. |
| C. | Compliance |
| Category 5 |
| GE recommends that you do this Service Bulletin as soon as the FINS nut shield is removed from the engine. |
| 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. |
| (2) | Condition: |
| The current FINS nut shield geometry may result in erosion on the FINS. |
| (3) | Cause: |
| Intermittent scallop features on the outer diameter of the FINS nut shield have caused the erosion on the FINS. |
| (4) | Improvement: |
| The new FINS nut shield removes the scallop geometry feature in order to take care of the erosion issue and in addition, a pre-performance improvement plan (PIP) configuration part is reintroduced. |
| (5) | Substantiation: |
| Substantiation is by comparative analysis. |
| F. | Approval |
| The data contained in this Service Bulletin has been reviewed by the appropriate governmental authority 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 0.13 lb (0.06 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) |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| Qualified interchangeability. |
| All four parts must be replaced with the new configuration concurrently. Mixing of the proposed and superseded configuration in the same engine is not permitted. However, both the proposed prime FINS nut shield P/N 2303M28P02 configuration and alternate FINS nut shield P/N 2303M28P01 configuration can be mixed, depending on what is available. |
| 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: |
| None. |
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes RE=Replace RM=Remains |
| Change Codes 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes A=Old parts will no longer be supplied. |
| D. | Parts Disposition |
| Discard old parts. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General |
| (1) | Removal and installation instructions of FINS nut shields (1, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-40-00, DISASSEMBLY 001 and ASSEMBLY 001, CONFIG 01 or CONFIG 02. |
