 | GEnx-1B SERVICE BULLETIN - 72-0402 R02 | Revised: 03/30/2020 |
| SB 72-0402 R02 ENGINE - P2 HPC Rotor Assembly (72-31-00) - Removal of Wire Seals from the HPC Rotor Assembly for GEnx-1B/P2 Engines | Issued: 02/20/2018 | |
| GEnx-1B SERVICE BULLETIN - 72-0402 R02 | Revised: 03/30/2020 |
| SB 72-0402 R02 ENGINE - P2 HPC Rotor Assembly (72-31-00) - Removal of Wire Seals from the HPC Rotor Assembly for GEnx-1B/P2 Engines | Issued: 02/20/2018 | |
| 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 (2020) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 2 TO SERVICE BULLETIN 72-0402 |
| Revision 2 is issued to update paragraph 1., PLANNING INFORMATION. |
| Revision 1 was issued March 28, 2018. The original was issued February 20, 2018. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64/P2, -1B67/P2, -1B70/75/P2, -1B70/P2, -1B70C/P2, -1B74/75/P2, -1B76A/P2 |
| This Service Bulletin is applicable to these 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 high pressure compressor (HPC) rotor assembly P/N 2305M51G08 and wire seal P/N 2454M03P01 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin provides instructions to remove the affected wire seals from the forward and aft wire seal grooves of the stages 6-10 compressor rotor spool (stages 6-10 spool) on the GEnx-1B/P2 engines. |
| C. | Compliance |
| Category 4 |
| GE recommends that you do this Service Bulletin when the stages 6-10 spool is exposed. |
| 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 reduce cost of ownership. |
| (2) | Condition: |
| The stages 6-10 spool uses wire seals between the blades and the spool rail. During operation, the wire seals can cause wear on the stages 6-10 spool. The wire seals can also wear and thus provide a minimal air sealing. |
| (3) | Cause: |
| The current wire seals can move within the wire seal grooves of the stages 6-10 spool. The movement causes wear to both the wire seal and wire seal groove. |
| (4) | Improvement: |
| The proposed design eliminates the use of wire seals in the grooves on the stages 6-10 spool. The wire seals are a source of wear which can result in an unserviceable condition of the stages 6-10 spool. Elimination of the wire seals also eliminates the source of the wear and thus improves the cost of ownership. |
| (5) | Substantiation: |
| Substantiation is by 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 |
| The complete compliance with this Service Bulletin decreases weight by 0.5 lb (0.2 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 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| Qualified interchangeability - Parts deleted. |
| For production, remove all the wire seals. |
| For field, it is acceptable to remove the wire seals from a single stage or a few stages of the stage 6 through stage 10 spool, if the workscope does not allow for removal of the wire seals from all the stages. Both sets of the wire seals (forward and aft) must be removed from an individual stage. The remaining wire seals must be removed on the next opportunity, when the wire seals are exposed. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
| None. |
| (2) | Other Spare Parts: |
|
| NOTE: |
|
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
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| Operation Codes 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. 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 Instructions |
| (1) | Disassemble the HPC rotor assembly and remove the wire seals (Figure 1) from the stages 6-10 spool. Removal instructions have not changed. Refer to the GEnx-1B EM, 72-31-00, DISASSEMBLY 001. |
| B. | Installation Instructions |
| (1) | Install the blades in the stages 6-10 spool. Refer to the GEnx-1B EM, 72-31-00, ASSEMBLY 001, CONFIGURATION 002 and do as follows: |
| (a) | Install the stage 6 blades without the wire seals (Figure 1). Do not do Subtask 72-31-00-440-229, step 3.B.(10), Subtask 72-31-00-160-017, and Subtask 72-31-00-440-230. |
| (b) | Install the stage 7 blades without the wire seals (Figure 1). Do not do Subtask 72-31-00-440-235, Subtask 72-31-00-160-018, and Subtask 72-31-00-440-236. |
| (c) | Install the stage 8 blades without the wire seals (Figure 1). Do not do Subtask 72-31-00-440-241. |
| (d) | Install the stage 9 blades without the wire seals (Figure 1). Do not do Subtask 72-31-00-440-246. |
| (e) | Install the stage 10 blades without the wire seals (Figure 1). Do not do Subtask 72-31-00-440-251. |
