 | GEnx-1B SERVICE BULLETIN - 72-0050 R02 | Revised: 07/31/2013 |
| SB 72-0050 R02 ENGINE - Cowl Support Rings (72-00-02) - Introduction of New Cowl Supports | Issued: 10/24/2011 | |
| GEnx-1B SERVICE BULLETIN - 72-0050 R02 | Revised: 07/31/2013 |
| SB 72-0050 R02 ENGINE - Cowl Support Rings (72-00-02) - Introduction of New Cowl Supports | Issued: 10/24/2011 | |
| 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 (2013) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 2 TO SERVICE BULLETIN 72-0050 |
| Revision 2 is issued to update paragraph 2.A., Material - Price and Availability and 2.C., Configuration Chart . |
| Revision 1 was issued July 26, 2012. The original was issued October 24, 2011. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
|
| This Service Bulletin has been introduced in production to this GEnx-1B engine: |
| • |
|
| These serial numbers are the best available data. |
| The old cowl supports P/N 2360M69G01 and P/N 2360M69G02 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces improved cowl supports P/N 2419M65G01, P/N 2419M65G02, and associated hardware. |
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's option. |
| NOTE: |
|
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To reduce weight. |
| (2) | Condition: |
| Initial cowl support design was not optimized for weight. |
| (3) | Cause: |
| The old cowl support has features that require extensive milling to form. |
| (4) | Improvement: |
| The contours of the cowl support and the bridge brackets are revised to improve RTV sealing between the components and prevent performance losses due to air leakage from the engine to the thrust reverser interface. Structural improvements such as bridge bracket bolt hole embossments reduce the stress on the cowl support. |
| (5) | Substantiation: |
| Substantiation is by analysis and 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 weight by 0.24 lb (0.11 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. All parts listed in this Service Bulletin have to be changed 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. |
| NP = Not Provisioned |
| NOTE: |
|
| (2) | Other Spare Parts: |
| None: |
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes DE=Delete RE=Replace RM=Remains RW=Rework |
| 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 engine locations. |
| D. | Parts Disposition |
| Discard old parts. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal |
| (1) | Removal instructions for the cowl supports (1 and 2, Figure 1) have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 002. |
| B. | Installation |
| (1) | Installation instructions for the cowl supports (1 and 2, Figure 1) have not changed. Refer to the GEnx-1B, 72-00-02 ASSEMBLY 005. |
| (2) | Install the cover plate (30-150, 72-00-02) as follows: |
| (a) | Install the cover plate (30-150, 72-00-02) on the cowl support (1) with four bolts (30-160, 72-00-02). |
| (b) | Torque the bolts in a criss cross pattern to 106-124 lb in. (12.9-14.0 Nm). |
