# General Electric Service Bulletin GE90-100 72-0926 Copy: Revision 01 ("GE90-100 SB 72-0926 R01"), 9 pages: PDF https://openairdocs.org/files/sha256/93/16/931699f35532320865c90ac76a93c9d2ce9eee604ae4f4d1518d0fa2d1289bec; text https://openairdocs.org/service-documents/ge/ge90-100-72-0926/file/931699f35532.md. Rights: © General Electric Company. Filed by the FAA in regulations.gov docket FAA-2025-1364; AD 2025-25-07 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. ## Details - Manufacturer: [General Electric](https://openairdocs.org/service-documents/ge.md) - Type: Service bulletin (Service Bulletin) - Number: GE90-100 72-0926 - Latest revision known: GE90-100 72-0926, Revision 01, dated December 22, 2023 (OpenAirDocs) - Page: https://openairdocs.org/service-documents/ge/ge90-100-72-0926 ## ADs that cite it (1) (OpenAirDocs) Newest first, with the revision each names, as OpenAirDocs read it from the AD's text. - [AD 2025-25-07](https://openairdocs.org/ad/2025-25-07.md), effective Feb 6, 2026: Revision 01 Also cited in [1 proposed AD](https://openairdocs.org/service-documents/ge/ge90-100-72-0926/proposed.md). ## Text (9 pages) Rights: © General Electric Company. Filed by the FAA in regulations.gov docket FAA-2025-1364; AD 2025-25-07 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service GE Designated: -CONFIDENTIAL- The information contained in this document is GE proprietary information and is disclosed in con- fidence. 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 cre- ation, manufacture, development, or derivation of any repairs, modi fications, 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 part. This technical data is considered subject to the Ex port Administration Regulations (EAR) pursuant to 15 CFR Parts 730-774. Transfer of this data by any means to a Non-U.S. 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 (2023) General Electric Company, U.S.A. October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 1 of 9 ### Page 2 ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service TRANSMITTAL INFORMATION REVISION 1 TO SERVICE BULLETIN 72-0926 Revision 1 is issued to update paragraph 4., A PPENDIX - A. The original was issued October 11, 2023. Revision bars in the left margin identify changes. 1. PLANNING INFORMATION A. Effectivity GE90-110B1 and -115B This Service Bulletin is applicable to these GE90-100 engines: . GE90-100 engines, serial numbers listed in paragraph 4., A PPENDIX - A, T able 1 and T able 2. These serial numbers are the best available data. The high pressure turbine rotor (HPTR) stage 1 disks P/N 1865M13G07 and P/N 1865M13G08 with a serial number listed in paragraph 4., A PPENDIX - A, T able 1 and the HPTR stage 2 disk P/N 1865M14P04 with a serial number listed in paragraph 4., A PPENDIX - A, T able 2 are affected by this Service Bulletin. B. Description This Service Bulletin provides instructions to remove from service the affected HPTR stage 1 disks and HPTR stage 2 disk. C. Compliance Category 2 GE recommends that you do this Service Bulletin as follows: . Remove from service the affected HPTR stage 1 disks before the removal threshold life speci fied in paragraph 4., A PPENDIX - A, T able 1 or at the next piece-part exposure of the affected HPTR stage 1 disk, whichever occurs first. . Remove from service the affected HPTR stage 2 disk before the removal threshold life speci fied in paragraph 4., A PPENDIX - A, T able 2 or at the next piece-part exposure of the affected HPTR stage 2 disk, whichever occurs first. Impact A This recommendation is to address a condition that may affect Flight Safety. NOTE: This Service Bulletin can be done in shop. 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 October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 2 GE Desi gnated: - CONFIDENTIAL Subject to the restrictions on the media ### Page 3 ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service 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 operator’s fleet. D. Concurrent Requirements None. E. Reason (1) Objective: T o remove parts from service. (2) Condition: There are HPTR stage 1 disks and HPTR stage 2 disks that must be removed from service. (3) Cause: Minimization of the risk of a signi ficant event. (4) Improvement: The affected HPTR stage 1 disks and HPTR stage 2 disk will be removed from service. (5) Substantiation: Substantiation is by 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 modi fication(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 109993, GE90-100 Engine Manual (EM) GEK 110005, GE90-100 Illustrated Parts Catalog (IPC) October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 3 GE Desi gnated: - CONFIDENTIAL Subject to the restrictions on the media ### Page 4 ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service J. Publications Affected None. K. Interchangeability Not applicable. L. Software Accomplishment Summary Not applicable. 2. MATERIAL INFORMATION A. Material - Price and Availability (1) Parts necessary to do this Service Bulletin: Part Number Qty/ Eng Part Name Unit ($) Price Pkg Qty Lead Time Days 1865M13G08 (1) Disk, HPTR Stage 1 Quote (-) -- 1865M14P04 (1) Disk, HPTR Stage 2 Quote (-) -- NOTE: Prices are found in the GE Materials Catalog. (2) Other Spare Parts: None. (3) Consumables: None. B. Industry Support Information None. C. Configuration Chart None. D. Parts Disposition Discard the removed affected parts. E. Tooling - Price and Availability None. October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 4 GE Desi gnated: - CONFIDENTIAL Subject to the restrictions on the media ### Page 5 ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service 3. ACCOMPLISHMENT INSTRUCTIONS A. Removal (1) Remove the affected HPTR stage 1 disk (1, Figure 1). Removal instructions have not changed. Refer to the GE90-100 EM, 72-53-00, DISASSEMBLY 001, CONFIG 03. (2) Remove the affected HPTR stage 2 disk (1, Figure 2). Removal instructions have not changed. Refer to the GE90-100 EM, 72-53-00, DISASSEMBLY 001, CONFIG 01, CONFIG 02, or CONFIG 03. B. Installation (1) Install a new or serviceable HPTR stage 1 disk (1, Figure 1). Installation instructions have not changed. Refer to the GE90-100 EM, 72-53-00, ASSEMBLY 001, CONFIG 02 or CONFIG 03. (2) Install a new or serviceable HPTR stage 2 disk (1, Figure 2). Installation instructions have not changed. Refer to the GE90-100 EM, 72-53-00, ASSEMBLY 001, CONFIG 02 or CONFIG 03. October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 5 GE Desi gnated: - CONFIDENTIAL Subject to the restrictions on the media ### Page 6 (OCR) GE O • -100 SERIES GE Aircraft Engines SERVICE BULLETIN ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service LEGEND: 1. HPTR STAGE 1 DISK P/N 1865M13G07 OR P/N 1865M13G08 6042443-00 HPTR Stage 1 Disk Location Figure 1 Revien i, December 2, 0 comer s October 11, 2023 GE90-100 S/B 72-0926 PAGE 6 GE Designated: - CONFIDENTIAL Subject to the restrictions on the media ### Page 7 (OCR) GE 00 - 100 SERIES GE Aircraft Engines SERVICE BULLETIN ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service LEGEND: 1. HPTR STAGE 2 DISK P/N 1865M14P04 6042444-00 HPTR Stage 2 Disk Location Figure 2 October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 7 GE Designated: - CONFIDENTIAL Subject to the restrictions on the media ### Page 8 ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service 4. APPENDIX - A T able 1. Affected HPTR Stage 1 Disk Engine Serial Number HPTR Stage 1 Disk Part Number HPTR Stage 1 Disk Serial Number HPTR Stage 1 Disk Part Cycles Since New (PCSN) Removal Threshold 901-085 1865M13G08 GWN10N9A* 4,650 901-247 1865M13G08 GWN15W47 4,650 901-377 1865M13G08 GWN13ERA 4,650 901-386 1865M13G08 GWN13E74 4,650 901-403 1865M13G08 GWN13JJ7 4,650 901-408 1865M13G08 GWN13E2K 4,650 901-424 1865M13G08 GWN13MLL 4,650 901-489 1865M13G08 GWN148JP 4,650 901-490 1865M13G08 GWN148JA 4,650 901-499 1865M13G08 GWN14EWR 4,650 906-180 1865M13G08 GWN11F3L 4,650 906-246 1865M13G08 GWN11FEW 4,650 906-308 1865M13G08 GWN13KPH 4,650 906-917 1865M13G07 GWN0NJ92* 4,650 906-978 1865M13G07 GWN0NJ94** 4,650 906-991 1865M13G07 GWN0NK87* 4,650 907-035 1865M13G08 GWN13L2F 4,650 907-275 1865M13G08 GWN131HF 4,650 907-357 1865M13G08 GWN131GR 4,650 907-376 1865M13G08 GWN0RJ4G* 4,650 907-378 1865M13G08 GWN0RJ4H 4,650 907-857 1865M13G08 GWN0WNW0 4,650 907-866 1865M13G08 GWN0WPEC* 4,650 These serial numbers are the best available data. NOTE 1: *Affected HPTR stage 1 disk serial numbers are already removed from the engine. **Affected HPTR stage 1 disk ser ial number is already scrapped. October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 8 GE Desi gnated: - CONFIDENTIAL Subject to the restrictions on the media ### Page 9 ENGINE - HP Turbine Rotor Assembly (72-53-00) - Removal of HPTR Stage 1 Disk and HPTR Stage 2 Disk from Service T able 2. Affected HPTR Stage 2 Disk Engine Serial Number HPTR Stage 2 Disk Part Number HPTR Stage 2 Disk Serial Number HPTR Stage 2 Disk PCSN Removal Threshold 901-085 1865M14P04 TMT4RK67* 11,300 901-140 1865M14P04 TMT4RN32 11,300 901-144 1865M14P04 TMT4RK60 11,300 901-623 1865M14P04 TMT1KJTR 11,300 901-624 1865M14P04 TMT1KJTK 11,300 901-625 1865M14P04 TMT1KJTJ 11,300 901-631 1865M14P04 TMT1KUEP 11,300 901-635 1865M14P04 TMT1KUF2 11,300 906-934 1865M14P04 TMT1KUER 11,300 907-163 1865M14P04 TMT5P617 11,300 907-184 1865M14P04 TMT5P618 11,300 907-240 1865M14P04 TMT5P704 11,300 907-389 1865M14P04 TMT5P865 11,300 907-423 1865M14P04 TMT5P914 11,300 907-633 1865M14P04 TMT4RD16 11,300 907-866 1865M14P04 TMT4RG10* 11,300 907-868 1865M14P04 TMT4RG09 11,300 907-869 1865M14P04 TMT4RG11** 11,300 907-913 1865M14P04 TMT4RG14 11,300 These serial numbers are the best available data. NOTE 2: *Affected HPTR stage 2 disk serial number is already removed from the engine. **Affected HPTR stage 2 disk serial number is already scrapped. October 11, 2023 GE90-100 S/B 72-0926 Revision 01, December 22, 2023 PAGE 9 GE Desi gnated: - CONFIDENTIAL Subject to the restrictions on the media --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.