 | GEnx-1B SERVICE BULLETIN - 72-0087 R01 | Revised: 09/27/2013 |
| SB 72-0087 R01 ENGINE - Outlet Guide Vanes and Fairings (72-21-00) - OGV Bolts and Washers Change | Issued: 04/03/2012 | |
| GEnx-1B SERVICE BULLETIN - 72-0087 R01 | Revised: 09/27/2013 |
| SB 72-0087 R01 ENGINE - Outlet Guide Vanes and Fairings (72-21-00) - OGV Bolts and Washers Change | Issued: 04/03/2012 | |
| 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 1 TO SERVICE BULLETIN 72-0087 |
| Revision 1 is issued to update paragraphs 1.E., Reason , 2.A., Material - Price and Availability , and 3., ACCOMPLISHMENT INSTRUCTIONS . |
| The original was issued April 03, 2012. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
|
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| • |
|
| These serial numbers are the best available data. |
| The flat washers P/N 133A1624P108 and bolts P/N AS3239-19 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin releases new flat washers P/N 2062M95P01 and bolts P/N AS3239-20 for the type 5 outlet guide vanes (OGV). |
| C. | Compliance |
| Category 4 |
| GE recommends that you do this Service Bulletin when the fan stator is exposed, consistent with the instructions in the interchangeability statement. |
| 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: |
| The GE90 aft fan case has experienced high cycle fatigue cracking due to high bolted joint mean stress and alternating stress. The high mean stress is due to thin washers that do not effectively distribute the bolt preload. The GEnx-1B has the same washer, similar case geometry and material, and type 5 fan OGV's which are subject to vibratory excitation at cruise, so it is at risk of similar high cycle fatigue cracking. |
| (3) | Cause: |
| High stress because of bolt preload and washers that do not effectively distribute the preload. |
| (4) | Improvement: |
| The new flat washers are thicker with rounded edges that reduce the stress by effectively spreading the bolt preload, and help to reduce the edge of contact effect. The new bolts are longer and accommodate the thicker washers. |
| (5) | Substantiation: |
| Substantiation is by 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 increases weight by 0.372 lb (0.17 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. |
| The thicker washer requires a longer bolt that creates a qualified interchangeability condition within the P/N 2447M18 and P/N 2305M18G07 assemblies. This change does not create any higher level interchangeability condition. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
|
| NP = Not provisioned |
| *Part not supplied by GE Engine Services Distribution L.L.C. Procure through local purchase. |
| NOTE: |
|
| (2) | Other Spare Parts: |
| None. |
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes AD=Add RM=Remains QTC=Quantity Change |
| Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Code E=Old parts will be supplied, and can be used at other engine locations. |
| D. | Parts Disposition |
| None. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal |
| (1) | Removal instructions for all OGVs have not changed. Refer to the GEnx-1B EM, 72-21-00, DISASSEMBLY 001. |
| B. | Installation |
| (1) | Install all OGVs with exceptions as follows. Refer to the GEnx-1B EM, 72-21-00, ASSEMBLY 001. |
| (a) | Install the OGV 24 (10-270, 72-21-00, Figure 1) to the aft fan case (01-020) as follows: |
| 1 | Prepare the OGV 24 for installation. Refer to GEnx-1B EM, 72-21-00, ASSEMBLY 001, Subtask 72-21-00-440-441. |
| 2 | Attach the OGV 24 to the aft fan case as follows: |
| a | Install the bolts (1), flat washers (10-390), flat washers (2), shims, and self locking nuts (10-420) on the OGV 24 as follows: |
| (1) | Install the flat washers (10-390) under the head of the bolts (1). |
| (2) | Install the shims between the OGV 24 and the aft fan case. |
| (3) | Install the flat washers (2) under the self locking nuts (10-420). |
| 3 | Make sure that the OGV 48 has the shims installed. |
| 4 | Torque the self locking nuts (10-420) at OGV 24 to 368-432 lb in. (41.6-48.8 N.m). |
| (b) | Install the OGVs 22 and 23 (10-270, 72-21-00) to the aft fan case (01-020) as follows: |
| 1 | Prepare the OGVs 22 and 23 for installation. Refer to GEnx-1B EM, 72-21-00, ASSEMBLY 001, Subtask 72-21-00-440-441. |
| 2 | Attach the OGVs 22 and 23 to the aft fan case as follows: |
| a | Install the bolts (1), flat washers (10-390), flat washers (2), shims, and self locking nuts (10-420) on the OGVs 22 and 23 as follows: |
| (1) | Install the flat washers (10-390) under the head of the bolts (1). |
| (2) | Install the shims between the OGV 22 and 23 and the aft fan case. |
| (3) | Install the flat washers (2) under the self locking nuts (10-420). |
| 3 | Make sure that the OGVs 46 and 47 have the shims installed. |
| 4 | Torque the self locking nuts (10-420) at OGVs 22 and 23 to 368-432 lb in. (41.6-48.8 N.m). |
| (c) | Install the OGVs 40 and 41 (10-270, 72-21-00) to the aft fan case (01-020) as follows: |
| 1 | Prepare the OGVs 40 and 41 for installation. Refer to GEnx-1B EM, 72-21-00, ASSEMBLY 001, Subtask 72-21-00-440-441. |
| 2 | Attach the OGVs 40 and 41 to the aft fan case as follows: |
| a | Install the bolts (1), flat washers (10-390), flat washers (2), shims, and self locking nuts (10-420) on the OGVs 40 and 41 as follows: |
| (1) | Install the flat washers (10-390) under the head of the bolts (1). |
| (2) | Install the shims between the OGVs 40 and 41 and the aft fan case. |
| (3) | Install the flat washers (2) under the self locking nuts (10-420). |
| 3 | Make sure that the OGVs 19-23 have the shims installed. |
| 4 | Torque the self locking nuts (10-420) at OGVs 40 and 41 to 368-432 lb in. (41.6-48.8 N.m). |
| (d) | Install the OGV 39 (10-270) to the aft fan case (01-020) as follows: |
| 1 | Prepare the OGV 39 for installation. Refer to GEnx-1B EM, 72-21-00, ASSEMBLY 001, Subtask 72-21-00-440-441. |
| 2 | Attach the OGV 39 (10-270, 72-21-00, Figure 1) to the aft fan case (01-020) as follows: |
| a | Attach the FADEC support bracket (05-080) to the OGV 39 (10-270) on the forward boltholes at two locations as follows: |
| (1) | Install the flat washer (10-390) below the head of the bolts (10-380) with the shims between the OGV 39 (10-270) and the aft fan case (01-020). |
| (2) | Install the FADEC support bracket (05-080) below the self-locking nuts (10-420) hand tight. |
| b | Install the OGV 39 (10-270) on the aft boltholes of the aft fan case (01-020) at two locations as follows: |
| (1) | Install the two flat washers (10-390) below the head of the bolts (1, Figure 1) with the shims between the OGV 39 (10-270) and the aft fan case (01-020). |
| (2) | Install the flat washers (2, Figure 1) below the two self-locking nuts (10-420) hand tight. |
| 3 | Make sure that the OGV 39 (10-270) has shims installed. |
| 4 | Torque the self-locking nuts (10-420) at OGV 39 (10-270) to 368-432 lb in. (41.6-48.8 N.m). |
