 | GEnx-1B SERVICE BULLETIN - 72-0036 R00 | Revised: 08/18/2011 |
| SB 72-0036 R00 ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of New HPT Stage 2 Nozzles and Spline Seals | Issued: 08/18/2011 | |
| GEnx-1B SERVICE BULLETIN - 72-0036 R00 | Revised: 08/18/2011 |
| SB 72-0036 R00 ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of New HPT Stage 2 Nozzles and Spline Seals | Issued: 08/18/2011 | |
| 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 high pressure turbine (HPT) stage 2 nozzle P/N 2305M56G05, HPT stage 2 nozzles P/N 2300M61G03, P/N 2300M61G04, HPT stage 2 nozzle spline seals P/N 2300M64P01, P/N 2300M64P03, P/N 2300M64P05, P/N 2300M64P06, and P/N 2300M64P07 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin releases the new HPT stage 2 nozzle P/N 2305M56G06, and improved HPT stage 2 nozzles P/N 2300M61G07, P/N 2300M61G08, HPT stage 2 nozzle spline seals P/N 2300M64P08, P/N 2300M64P09, P/N 2300M64P10, P/N 2300M64P11, P/N 2300M64P12. The HPT stage 2 nozzles are being released to improve spline seal slot configuration and nozzle thermal barrier coating (TBC). |
| C. | Compliance |
| Category 6 |
| GE recommends that you do this Service Bulletin when the HPT stage 2 nozzles are routed for repair. |
| 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, improve reliability, and reduce cost of ownership. |
| (2) | Condition: |
| Breakout of parts have been observed on HPT stage 2 nozzle spline seals on some of the GEnx development engines. The new HPT stage 2 nozzle TBC provides unnecessary environmental protection. |
| (3) | Cause: |
| Seal slot breakout resulting from the manufacturing process. Enhanced environmental protection not required to meet maintenance specification. |
| (4) | Improvement: |
| The new seal configuration adjusts HPT stage 2 nozzle spline seal locations and sizes to provide more metal between the slot and the flowpath. |
| The coating change from platinum aluminide to a simple aluminide for the HPT stage 2 nozzle provides optimal nozzle protection. |
| Depending on engine operating characteristics and configuration, this Service Bulletin can improve specific fuel consumption (SFC). This design change leads to 0.006 percent SFC increase due to increased leakage around the nozzle bands. |
| (5) | Substantiation: |
| Substantiation is by comparative analysis. |
| F. | Approval |
| This Service Bulletin contains no modification information that revises the approved configuration and therefore does not require FAA approval. |
| 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 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| NOTE: |
|
| J. | Publications Affected |
| GEK 112851, GEnx-1B Engine Manual (EM) |
| GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| All parts listed in this Service Bulletin have to be replaced as a set. HPT stage 2 nozzle P/N 2305M56G06 will be fully interchangeable with older configurations, however, older configurations will not be supported. |
| 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: |
|
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
| Operation Codes AD=Add DE=Delete RE=Replace RM=Remains RW=Rework |
| Change Code 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Code A=Old parts will no longer be supplied. |
| D. | Parts Disposition |
| Use serviceable old parts for engines that have not changed. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal |
| (1) | Removal instructions for the HPT stage 2 nozzle (1, Figure 1) have not changed. Refer to GEnx-1B EM, 72-52-00, DISASSEMBLY 001. |
| B. | Installation |
| (1) | Installation instructions for the HPT stage 2 nozzle (1, Figure 1) have not changed, except new spline seals are used. Refer to GEnx-1B EM, 72-52-00, ASSEMBLY 001 and as follows: |
| (a) | Install spline seals in the HPT stage 2 nozzle (2, 3) as follows. Refer to Figure 1. |
| 1 | Apply a small amount of beeswax (C10-154), utility wax (C10-109), or adhesive (C01-037) to the seal slots on the same end of each HPT stage 2 nozzle (2, 3). |
| CAUTION: |
|
| 2 | Install the outer spline seals (174W2, 174W4) and (4, 9, 10) in the side of each HPT stage 2 nozzle (2, 3) that has beeswax, utility wax, or adhesive. |
| 3 | Install the inner spline seals (6, 7) in the side of each HPT stage 2 nozzle (2, 3) that has beeswax, utility wax, or adhesive. |
| 4 | Install the second set of inner spline seals (174WB, 174WC) in the side of each HPT stage 2 nozzle (2, 3) that has beeswax, utility wax, or adhesive. |
| NOTE: |
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