 | GEnx-1B SERVICE BULLETIN - 72-0364 R01 | Revised: 03/28/2018 |
| SB 72-0364 R01 ENGINE - HPT Stage 2 Nozzle Assembly (72-52-00) - Introduction of New HPT Stage 2 Nozzles, Air Tube, and Internal Retainer Ring | Issued: 05/18/2017 | |
| GEnx-1B SERVICE BULLETIN - 72-0364 R01 | Revised: 03/28/2018 |
| SB 72-0364 R01 ENGINE - HPT Stage 2 Nozzle Assembly (72-52-00) - Introduction of New HPT Stage 2 Nozzles, Air Tube, and Internal Retainer Ring | Issued: 05/18/2017 | |
| 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 (2018) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 1 TO SERVICE BULLETIN 72-0364 |
| Revision 1 is issued to update paragraphs 1.I., References and 3., ACCOMPLISHMENT INSTRUCTIONS. |
| The original was issued May 18, 2017. Revision bars in the left margin identify changes. |
| 1. | PLANNING INFORMATION |
| A. | Effectivity |
| * * * FOR GEnx-1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1B70C/P1, -1B70C/P2, -1B74/75/P1, -1B74/75/P2, -1B76A/P2 |
| This Service Bulletin is applicable to these GEnx-1B engines: |
| GEnx-1B engines, serial numbers 956-102 through 956-915. |
| This Service Bulletin has been introduced in production to these GEnx-1B engines: |
| GEnx-1B engines, serial numbers 956-916 and up. |
| These serial numbers are the best available data. |
| The high pressure turbine (HPT) stage 2 nozzles P/N 2300M61G07, P/N 2300M61G08, P/N 2300M61G11, P/N 2300M61G12, P/N 2300M61G13, and P/N 2300M61G14, HPT nozzle stage 2 air tube (air tube) P/N 2327M88P01, and retaining ring P/N 9631M84P18 are affected by this Service Bulletin. |
| B. | Description |
| This Service Bulletin introduces new HPT stage 2 nozzles P/N 2300M61G15, P/N 2300M61G16, P/N 2733M11G01, P/N 2733M11G02, P/N 2733M11G03, and P/N 2733M11G04, air tube P/N 2327M88P02, and internal retainer ring P/N 2557M06P02. |
| C. | Compliance |
| Category 6 |
| GE recommends that you do this Service Bulletin when the HPT stage 2 nozzle is routed for repair. |
| 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 introduce new parts, rework parts, and improve maintainability. |
| (2) | Condition: |
| The current air tubes and the mating portion of the HPT stage 2 nozzles have been found with significant wear in the field. The current retaining rings have been observed to lose hardness in operation. |
| (3) | Cause: |
| Loose air tubes spin, causing wear on the mating portion of the HPT stage 2 nozzles. |
| (4) | Improvement: |
| Dimensional changes have been made to the air tube and the mating portion of the HPT stage 2 nozzle to improve fit and reduce operational wear. The internal retainer ring has a different geometry which will improve retention in operation. |
| (5) | Substantiation: |
| Substantiation is by analysis and comparative 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 increases weight by 0.12 lb (0.054 kg). |
| 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) |
| GEnx-1B S/B 72-0036, ENGINE - Propulsor Module Assembly (72-00-00) - Introduction of New HPT Stage 2 Nozzles and Spline Seals |
| Repair Document (RD) 174-200 (P1 or higher), High Pressure Turbine Stage 2 Nozzle Assembly - High Pressure Turbine Stator Stage 2 Nozzles - Alteration - Vane Sleeve Replacement |
| Repair Document (RD) 174-205 (L1 or higher), High Pressure Turbine Stage 2 Nozzle Assembly - High Pressure Turbine Stator Stage 2 Nozzles - Alteration - Vane Sleeve Replacement for Quick-Turn Continued Time Shop Visit |
| NOTE: |
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| NOTE: |
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| 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 |
| Qualified interchangeability. |
| In the field during engine overhaul, the new HPT stage 2 nozzles P/N 2300M61G15 and P/N 2300M61G16 can be mixed within HPT stage 2 nozzle assemblies P/N 2305M56G06 or P/N 2305M56G08 with old HPT stage 2 nozzles P/Ns 2300M61G07/G08/G11/G12/G13/G14 or with reworked HPT stage 2 nozzles P/Ns 2733M11G01/G02/G03/G04. The HPT stage 2 nozzles P/Ns 2300M61G07/G08/G11/G12/G13/G14 require the old air tube P/N 2327M88P01, while the HPT stage 2 nozzles P/Ns 2300M61G15/G16 and P/Ns 2733M11G01/G02/G03/G04 require the new air tube P/N 2327M88P02. |
| In the field during engine overhaul, the new HPT stage 2 nozzles P/N 2300M61G15 and P/N 2300M61G16 may not be mixed within HPT stage 2 nozzle assemblies P/N 2305M56G03, P/N 2305M56G04, or P/N 2305M56G05. The new HPT stage 2 nozzles P/N 2300M61G15 and P/N 2300M61G16 require post-GEnx-1B S/B 72-0036 spline seals. |
| Any current retaining ring P/N 9631M84P18 removed during the engine overhaul must be replaced with the new internal retainer ring P/N 2557M06P02. The serviceable retaining ring P/N 9631M84P18 may be left installed during the HPT stage 2 nozzle assembly overhaul at a quick-turn shop visit. |
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
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| NOTE: |
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| (2) | Other Spare Parts: |
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| NOTE: |
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| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
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| Operation Codes AD=Add DE=Delete QTC=Quantity Change RE=Replace RM=Remains RW=Rework |
| Change Codes 1=One-way interchangeable. 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| Support Codes A=Old parts will no longer be supplied. C=Old parts will be supplied until April 2020. |
| D. | Parts Disposition |
| Rework. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | Removal/Disassembly |
| (1) | Removal/disassembly instructions of the old HPT stage 2 nozzle assembly have not changed. Refer to the GEnx-1B EM, 72-52-00, DISASSEMBLY 001. |
| B. | Configuration Upgrade Procedure |
| (1) | For HPT stage 2 nozzle rework during the HPT stage 2 nozzle full repair, do as follows: |
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| (a) | Rework the old HPT stage 2 nozzles P/Ns 2300M61G07/G11/G13 (SIN 174A0) and P/Ns 2300M61G08/G12/G14 (SIN 174A1). Refer to RD 174-200. |
| (2) | For HPT stage 2 nozzle rework during a quick-turn or continued-time shop visit as specified in the GEnx-1B CIR, 72-00-00, INSPECTION 001, do as follows: |
| (a) | Rework the old HPT stage 2 nozzles P/Ns 2300M61G07/G11/G13 (SIN 174A0) and P/Ns 2300M61G08/G12/G14 (SIN 174A1). Refer to RD 174-205. |
| C. | Assembly/Installation |
| (1) | Assembly/installation instructions of the new HPT stage 2 nozzle assembly have not changed. Refer to the GEnx-1B EM, 72-52-00, ASSEMBLY 001, CONFIG 01 and CONFIG 02. |
| NOTE: |
|
