 | GEnx-1B SERVICE BULLETIN - 75-0030 R00 | Revised: 04/18/2018 |
| SB 75-0030 R00 AIR - Transient Bleed Manifold (75-31-21) - Introduction of New Transient Bleed Air Duct and CDP Port Cover Machine Bolt | Issued: 04/18/2018 | |
| GEnx-1B SERVICE BULLETIN - 75-0030 R00 | Revised: 04/18/2018 |
| SB 75-0030 R00 AIR - Transient Bleed Manifold (75-31-21) - Introduction of New Transient Bleed Air Duct and CDP Port Cover Machine Bolt | Issued: 04/18/2018 | |
| 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, -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, -1B76A/P2 |
| This Service Bulletin is applicable to all GEnx-1B engines. |
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
|
| These serial numbers are the best available data. |
| The machine bolts (bolts) P/N AS3239-10, P/N AS3580-6-16, and P/N J1496P13A are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces new longer bolts P/N AS3239-14, P/N AS3580-6-20, and P/N J1496P17A, used to attach the transient bleed air duct and compressor discharge pressure (CDP) port cover to the compressor diffuser nozzle (CDN) case. |
| C. | Compliance |
| Category 3 |
| GE recommends that you do this Service Bulletin at the next shop visit of the engine/module. |
| Impact D |
| This recommendation is to address a condition that may result in a Delay or Cancellation (D&C). |
| 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: |
| One engine has been found with a missing bolt from one of the CDN case pads. |
| (3) | Cause: |
| The current bolt length is insufficient to supply an adequate margin of proper thread engagement with the secondary retention feature of the threaded inserts. |
| (4) | Improvement: |
| Longer bolts are introduced at two locations, eight bolts in total. The locations are the two transient bleed air manifold for ports pre-GEnx-1B S/B 72-0065 engines, and the transient bleed air duct port and CDP port cover port for post-GEnx-1B S/B 72-0065 engines. |
| (5) | Substantiation: |
| Substantiation is by 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 CDN, you will need approximately 1 man-hour for each engine or component. |
| 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 72-0065, ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of One-Port TBV Duct |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| Qualified interchangeability. |
| The old bolts must be replaced with new bolts P/N J1496P17A, P/N AS3239-14, or P/N AS3580-6-20. |
| 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 |
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| Operation Codes AD=Add DE=Delete RE=Replace RM=Remains |
| Change Codes 2=Two-way interchangeable. 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes A=Old parts will no longer be supplied. 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 |
| Use serviceable old parts at other engine locations. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal |
| (1) | Remove the old bolts (1, Figure 1). Removal instructions have not changed. Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003. |
| B. | Installation |
| (1) | Install the new bolts (1, Figure 1). Installation instructions have not changed. Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004, CONFIG 01 or CONFIG 02. |
