 | GEnx-1B SERVICE BULLETIN - 72-0067 R00 | Revised: 12/02/2011 |
| SB 72-0067 R00 ENGINE - Combustor Diffuser Nozzle Assembly (72-40-00) - Introduction of New Combustion Chamber | Issued: 12/02/2011 | |
| GEnx-1B SERVICE BULLETIN - 72-0067 R00 | Revised: 12/02/2011 |
| SB 72-0067 R00 ENGINE - Combustor Diffuser Nozzle Assembly (72-40-00) - Introduction of New Combustion Chamber | Issued: 12/02/2011 | |
| 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 combustion chamber assembly P/N 2258M80G01 is affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin provides a new combustion chamber assembly P/N 2258M80G06 with a new improved inner liner P/N 2255M82G06. |
| 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 introduce a new part and improve reliability. |
| (2) | Condition: |
| The current configuration of the inner liner P/N 2255M82G05 has a wider range of cooling airflow. |
| (3) | Cause: |
| There is a need to improve the combustion chamber assembly exit temperature profile control to improve the turbine hardware durability. |
| (4) | Improvement: |
| The new inner liner P/N 2255M82G06 has reduced airflow tolerance and sets the flow to the high side to improve the exit temperature profile. This will improve the turbine module durability. |
| (5) | Substantiation: |
| Substantiation is by 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 |
| 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) |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112862, Cleaning, Inspection, and Repair Manual (CIR) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| The old combustion chamber assembly P/N 2258M80G01 and the new combustion assembly P/N 2258M80G06 are two-way interchangeable for the entry into service (EIS) combustor diffuser assembly P/N 2376M54G01 and P/N 2376M54G02. The old combustion chamber assembly P/N 2258M80G01 and the new combustion assembly P/N 2258M80G06 are not interchangeable in the performance improvement plan (PIP) 1 combustor diffuser assembly P/N 2376M54G06, where only the new combustion assembly P/N 2258M80G06 can be used. |
| 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 RE=Replace RM=Remains |
| Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Code B=Old parts will be supplied until all old parts are sold. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General |
| (1) | Removal and Installation instructions for the combustion chamber assembly have not changed. Refer to GEnx-1B EM, 72-41-00, DISASSEMBLY 001 and 72-41-00, ASSEMBLY 001. |