 | GEnx-1B SERVICE BULLETIN - 72-0110 R03 | Revised: 09/21/2018 |
| SB 72-0110 R03 ENGINE - Combustion Chamber Assembly (72-42-00) - Introduction of Reworked Inner and Outer Liners with T800 Coated Aft Seal Leg | Issued: 11/05/2012 | |
| GEnx-1B SERVICE BULLETIN - 72-0110 R03 | Revised: 09/21/2018 |
| SB 72-0110 R03 ENGINE - Combustion Chamber Assembly (72-42-00) - Introduction of Reworked Inner and Outer Liners with T800 Coated Aft Seal Leg | Issued: 11/05/2012 | |
| 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 (2018) General Electric Company, U.S.A. |
| TRANSMITTAL INFORMATION |
| REVISION 3 TO SERVICE BULLETIN 72-0110 |
| Revision 3 is issued to update paragraphs 1., PLANNING INFORMATION, 2., MATERIAL INFORMATION and 3., ACCOMPLISHMENT INSTRUCTIONS. |
| Revision 2 was issued February 16, 2017. Revision 1 was issued March 04, 2016. The original was issued November 05, 2012. 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 all GEnx-1B engines. |
| B. | Description |
| This Service Bulletin releases new inner liners P/N 2541M22G01, P/N 2541M22G02, and P/N 2541M22G03 and new outer liners P/N 2541M17G01, P/N 2541M17G02, P/N 2541M17G04, P/N 2541M17G05, and P/N 2541M17G06 to the Engine Illustrated Parts Catalog (EIPC) to be used in fielded combustion chamber assemblies P/Ns 2258M80G01/G06/G08/G09/G10/G13 and P/N 2745M50G01. |
| Also, this Service Bulletin provides a reference to Repair Document (RD) 124-1201 to rework the old outer liners P/N 2257M50G01, P/N 2255M81G08, and P/N 2255M81G10 to the new P/N 2541M17G02, P/N 2541M17G04, and P/N 2541M17G05 configurations respectively, to be used in fielded combustion chamber assemblies P/Ns 2258M80G08/G09/G10/G13. The RD 124-1201 also allows rework of the old outer liner P/N 2753M63G01 to the new P/N 2541M17G06 configuration, to be used in the fielded combustion chamber assembly P/N 2745M50G01. |
| In addition, this Service Bulletin provides a reference to RD 124-1199 to rework the old inner liners P/N 2255M82G06 and P/N 2255M82G09 to the new P/N 2541M22G01 and P/N 2541M22G02 configurations respectively, to be used in fielded combustion chamber assemblies P/Ns 2258M80G06/G08/G09/G10/G13. RD 124-1199 also allows rework of the old inner liner P/N 2753M64G01 to the new P/N 2541M22G03 configuration, to be used in the fielded combustion chamber assembly P/N 2745M50G01. |
| These new inner and outer liner part numbers released herein allow the rework of the inner and outer liner aft seal legs to apply the T800 coating to build up recover parts that have been returned from service with wear on the aft seal leg surface. |
| NOTE: |
|
| C. | Compliance |
| Category 7 |
| GE recommends that you do this Service Bulletin at customer's convenience. |
| Impact F |
| Implement as deemed necessary per the Service Bulletin Category. |
| NOTE: |
|
| D. | Concurrent Requirements |
| None. |
| E. | Reason |
| (1) | Objective: |
| To rework parts (to apply T800 coating to restore the aft seal leg to the original dimensional height). |
| (2) | Condition: |
| The potential for wear of the inner liner P/N 2255M82G06, P/N 2255M82G09, or P/N 2753M64G01 and outer liner P/N 2255M81G05, P/N 2255M81G06, P/N 2255M81G08, P/N 2255M81G10, or P/N 2753M63G01 aft seal leg supports has led to repair programs to restore field returned parts to new drawing limits. The repairs offered by RD 124-1201 (for inner liners) and RD 124-1199 (for outer liners) apply a T800 coating to restore the aft seal leg support dimensions, which is a different material from the production definition and requires a separate part number for reuse. |
| (3) | Cause: |
| The wear of the aft seal leg is the result of normal contact loading with the stage 1 HPT nozzle leaf seals. If this condition is not repaired and restored to the original dimensions, a leakage at the interface can occur, resulting in a detrimental effect on engine performance. Recovery of the aft seal leg support height is required at shop visits to restore the interface and reduce leakage levels. |
| (4) | Improvement: |
| The rework procedures of the applicable RD 124-1201 and RD 124-1199 allow recovery of the inner liners P/N 2255M82G06, P/N 2255M82G09, and P/N 2753M64G01 and outer liners P/N 2255M81G05, P/N 2255M81G06, P/N 2255M81G08, P/N 2255M81G10, and P/N 2753M63G01 with excessive wear as a result of normal operation. The application of coating restores the part to new drawing dimensional limits. |
| (5) | Substantiation: |
| Substantiation is by 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 |
| Weight and balance are not changed. |
| I. | References (Use the latest version of these documents) |
| GEK 112862, GEnx-1B Cleaning, Inspection, and Repair Manual (CIR) |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| Deleted |
| Repair Document (RD) 124-1199 (L1 or higher), Combustion Chamber Assembly - Combustion Chamber Inner Liner - Alteration - Application of the T800 Wear Coating to the Leaf Seal Flange |
| Repair Document (RD) 124-1201 (L1 or higher), Combustion Chamber Assembly - Combustion Chamber Outer Liner - Alteration - Application of the T800 Wear Coating to the Leaf Seal Flange |
|
| NOTE: |
|
| J. | Publications Affected |
| GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) |
| K. | Interchangeability |
| Qualified interchangeability. |
| The outer liners P/N 2541M17G01 and P/N 2541M17G02 have a thin aft support material and are only permitted on the fielded combustion chamber assemblies P/Ns 2258M80G01/G06/G08. |
| The outer liners P/N 2541M17G04 and P/N 2541M17G05 have a thick aft support material and are permitted on all fielded combustion chamber assemblies P/Ns 2258M80G01/G06/G08/G09/G10/G13. The outer liner P/N 2541M17G06 has a thick aft support material and a unique shaped multi-hole cooling pattern and is permitted on the fielded combustion chamber assembly P/N 2745M50G01. |
| The inner liner P/N 2541M22G01 has round multi-hole cooling pattern and is restricted to the fielded combustion chamber assemblies P/Ns 2258M80G01/G06/G08/G09/G10, whereas the inner liner P/N 2541M22G02 has shaped multi-hole cooling pattern, no combustion chamber assembly restriction, and is permitted on fielded combustion chamber assemblies, P/Ns 2258M80G01/G06/G08/G09/G10/G13. The Inner liner P/N 2541M22G03 has a unique shaped multi-hole cooling pattern and is permitted on the fielded combustion chamber assembly P/N 2745M50G01. |
| NOTE: |
|
| L. | Software Accomplishment Summary |
| Not applicable. |
| 2. | MATERIAL INFORMATION |
| A. | Material - Price and Availability |
| (1) | Parts necessary to do this Service Bulletin: |
| None. |
| (2) | Other Spare Parts: |
| None. |
| (3) | Consumables: |
| None. |
| B. | Industry Support Information |
| None. |
| C. | Configuration Chart |
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operation Codes RI=Reidentify RM=Remains RW=Rework |
| Change Codes 2=Two-way interchangeable. 5=Qualified interchangeability. Refer to paragraph 1.K., Interchangeability. |
| D. | Parts Disposition |
| Rework. |
| E. | Tooling - Price and Availability |
| None. |
| 3. | ACCOMPLISHMENT INSTRUCTIONS |
| A. | General |
| (1) | The disassembly instructions for the combustion chamber assembly (Figure 1) have not changed. Refer to the GEnx-1B CIR, 72-00-42, REPAIR 001. |
| (2) | Do a dimensional inspection of the outer liner (Figure 1) dimension SH at piece-part level for aft seal leg wear. Refer to the GEnx-1B CIR, 72-42-04, INSPECTION 001, Subtask 72-42-04-220-048 and as follows: |
| (a) | If dimension SH is under minimum limits, the part is not serviceable. |
| (b) | Rework the outer liner (Figure 1) and apply T800 coating to build up the seal surface. Refer to RD 124-1201 and do as follows: |
| 1 | After the application of T800 coating is complete, reidentify the outer liner(s). Refer to RD 124-1201 (Configuration Chart). |
| (3) | Do a dimensional inspection of the inner liner (Figure 1) dimension TH at piece-part level for aft seal leg wear. Refer to the GEnx-1B CIR, 72-42-05, INSPECTION 001, Subtask 72-42-05-220-026 and as follows: |
| (a) | If dimension TH is under minimum limits, the part is not serviceable. |
| (b) | Rework the inner liner (Figure 1) and apply T800 coating to build up the seal surface. Refer to RD 124-1199 and do as follows: |
| 1 | After the application of T800 coating is complete, reidentify the affected inner liner(s). Refer to RD 124-1199 (Configuration Chart). |
| (4) | The assembly instructions for the combustion chamber assembly (Figure 1) have not changed. Refer to the GEnx-1B CIR, 72-00-42, REPAIR 002. |
