 | GEnx-1B SERVICE BULLETIN - 72-0056 R00 | Revised: 12/19/2011 |
| SB 72-0056 R00 ENGINE - Fan Stator Module Assembly (72-00-01) - Introduction of EMU Support Brackets | Issued: 12/19/2011 | |
| GEnx-1B SERVICE BULLETIN - 72-0056 R00 | Revised: 12/19/2011 |
| SB 72-0056 R00 ENGINE - Fan Stator Module Assembly (72-00-01) - Introduction of EMU Support Brackets | Issued: 12/19/2011 | |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
|
| This Service Bulletin is applicable to these GEnx-1B engines: |
| • |
|
| These serial numbers are the best available data. |
| The engine monitoring unit (EMU) support brackets P/N 2377M34G01, P/N 2318M70G01, P/N 2377M35G01, P/N 2351M54G01, and P/N 2377M38G01 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces new EMU support brackets P/N 2447M81P01, P/N 2447M76P01, P/N 2438M06G01, P/N 2447M77G01, P/N 2438M38G01, and P/N 2447M78G01. |
| C. | Compliance |
| Category 9 |
| Information only. |
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To introduce new parts and improve maintainability. |
| (2) | Condition: |
| The current EMU support brackets can be used only with the EMU P/N 2122M32P06. |
| (3) | Cause: |
| Fan blade out analysis showed that the 4 bolts holding the EMU P/N 2122M32P06 feet to the extruded chasis were not strong enough to withstand the EMU load. |
| (4) | Improvement: |
| The new EMU support brackets configuration allows the installation of the one piece cast chasis for the EMU P/N 2122M32P08. All the interfaces and stack ups are not affected and there is also a weight reduction in the engine. |
| (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 deceases weight by 0.97 lb ( 0.44 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) |
| GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM) |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| GEnx-1B Boeing 787 Aircraft Maintenance Manual (AMM) |
| K. | Interchangeability |
| The old EMU support brackets are not interchangeable with the new EMU support brackets. The new EMU support brackets can be used with the EMUs P/N 2122M32P06 and P/N 2122M32P08. Previously produced engines will have to be retrofitted to match the introduction of the EMU P/N 2122M32P08. |
| 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 AD=Add DE=Delete RE=Replace RM=Remains RW=Rework QTC=Quantity Change |
| Change Code 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 |
| None. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General. |
| (1) | Removal and installation instructions for the EMU support brackets (1 and 2, Figure 1) from the fan case mid ring have not changed. Refer to the GEnx-1B EM, 72-00-01, DISASSEMBLY 001 and ASSEMBLY 001. |
| (2) | Removal and installation instructions for the EMU support brackets (3 and 4, Figure 2) from the fan case forward ring flange have not changed. Refer to the GEnx-1B EM, 72-21-00, DISASSEMBLY 001 and ASSEMBLY 001. |
| (3) | Install the EMU support bracket (bracket) (5, 6) as follows: |
| (a) | Attach the bracket (5) to the bracket (3) with bolts (7). |
| (b) | Attach the bracket (6) to the bracket (4) with bolts (7). |
| (c) | Torque the bolts (7) to 106-124 lb in. (12.0-14.0 N.m). |
