# General Electric Service Bulletin GEnx-1B 73-0116: No revision named - Rights: © General Electric Company. Filed by the FAA in regulations.gov docket FAA-2026-2717; AD 2026-14-03 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication. - Document: [General Electric Service Bulletin GEnx-1B 73-0116](https://openairdocs.org/service-documents/ge/genx1b-73-0116.md) - Title as filed: GEnx-1B Service Bulletin 73-0116-R00_2025-11-04 - Pages: 7 - PDF: https://openairdocs.org/files/sha256/6f/8a/6f8a39b0e4fafbc83981a077b38d244d176718a32999a56705afbaaae765bb1c - Page: https://openairdocs.org/service-documents/ge/genx1b-73-0116/file/6f8a39b0e4fa ## Text 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 GEnx-1B (LR) Service Bulletins (SBs) SB 73-0116 R00 ENGINE FUEL AND CONTROL - Fuel Tubes (73-11-41) - FCOC Fuel Return Hose Manifold and FCOC Fuel Cooling Inlet Tube Hose Inspection and Replacement Date Printed: 2025 /11/05 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 1 of 7 GEnx-1B SERVICE BULLETIN - 73-0116 R00 Revised: 11/04 /2025 SB 73-0116 R00 ENGINE FUEL AND CONTROL - FUEL TUBES (73-11-41) - FCOC FUEL RETURN HOSE MANIFOLD AND FCOC FUEL COOLING INLET TUBE HOSE INSPECTION AND REPLACEMENT Issued: 11/04 /2025 GE Designated: -CONFIDENTIAL- 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 part. This technical data is considered Export Administration Regulations (EAR) 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 (2025) General Electric Company, U.S.A. 1. PLANNING INFORMATION A. Effectivity * * * GEnx-1B64, -1B64/P1, -1B64/P2, -1B67, -1B67/P1, -1B67/P2, -1B70, -1B70/75/P1, -1B70/75/P2, -1B70/P1, -1B70/P2, -1 B70C/P1, -1B70C/P2, -1B74/75/P1, -1B74/75/P2, -1B76/P2, -1B76A/P2 This Service Bulletin is applicable to all GEnx-1B engines. The fuel cooled oil cooler (FCOC) fuel return hose manifold P/N and FCOC fuel cooling inlet tube 2426M07P01 hose P/N , with lot numbers 684141 and/or 677536 markings, are affected by this Service Bulletin.2426M08P01 B. Description This Service Bulletin provides instructions to identify the supplier marking of the suspect FCOC fuel return hose manifold and FCOC fuel cooling inlet tube hose and replace them if confirmed within suspect population. C. Compliance Category 3 GE recommends that you do this Service Bulletin at the next shop visit of the engine/module. 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 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: To remove parts from service. (2) Condition: Hose preform lot numbers 684141 and 677536 are suspect for quality investigation. ### Page 2 GEnx-1B (LR) Service Bulletins (SBs) SB 73-0116 R00 ENGINE FUEL AND CONTROL - Fuel Tubes (73-11-41) - FCOC Fuel Return Hose Manifold and FCOC Fuel Cooling Inlet Tube Hose Inspection and Replacement Date Printed: 2025 /11/05 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 2 of 7 (3) Cause: A FCOC fuel cooling inlet tube hose with hose preform lot numbers 684141 and 677536, was found with a leak. (4) Inspection: This Service Bulletin is addressing the identification and removal of the FCOC fuel return hose manifold and FCOC fuel cooling inlet tube hose with hose preform lot numbers 684141 and 677536. (5) Substantiation: Substantiation is by fleet experience. 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 9250, Commercial Engine Standard Practices Manual (SPM) GEK 112851, GEnx-1B Engine Manual (EM) GEK 112864, GEnx-1B Engine Illustrated Parts Catalog (EIPC) NOTE: The reference documents listed below are for the engine manufacturer's internal use only: BPP/EPEX No.: 114764 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: None. (2) Other Spare Parts: Part Number Qty/ Eng Part Name Unit ($) Price Pkg Qty Lead Time Days 2426M07P01 (1) Manifold, FCOC Fuel Return Hose Quote (-) -- 2426M08P01 (1) Tube Hose, FCOC Fuel Cooling Inlet Quote (-) -- NOTE: Prices are found in the GE Materials Catalog. (3) Consumables: None. B. Industry Support Information GE is pleased to provide industry support for compliance with this Service Bulletin as outlined below: (1) Customer is eligible to submit a claim for a one-time back-end spare parts credit per each eligible FCOC fuel cooling inlet tube hose and FCOC fuel return hose manifold (as defined in paragraph 3.B., ) in the Identification amount of 50 percent of the actual price paid (up to the GE catalog list price) for parts identified in preform lot number 684141 and/or 677536. (2) To submit a warranty claim, refer to paragraph 4., .APPENDIX - A C. Configuration Chart None. D. Parts Disposition ### Page 3 GEnx-1B (LR) Service Bulletins (SBs) SB 73-0116 R00 ENGINE FUEL AND CONTROL - Fuel Tubes (73-11-41) - FCOC Fuel Return Hose Manifold and FCOC Fuel Cooling Inlet Tube Hose Inspection and Replacement Date Printed: 2025 /11/05 GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced without the express written consent of GE. Technical data is considered ITAR and/or EAR controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly prohibited. Page 3 of 7 If the FCOC fuel return hose manifold P/N and/or FCOC fuel cooling inlet tube hose P/N 2426M07P01 2426M08P01 has hose preform lot number 684141 and/or 677536, refer to paragraph 3.B., and do as follows:Identification (1) For engine installed parts: (a) Replace the part as specified in paragraphs 3.C., Removal of FCOC Fuel Cooling Inlet Tube Hose and and 3.D., FCOC Fuel Return Hose Manifold Installation of FCOC Fuel Cooling Inlet Tube Hose and .FCOC Fuel Return Hose Manifold (2) For shelf stock parts: (a) For new, uninstalled parts, remove from inventory. The identified suspect part can be locally scrapped. E. Tooling - Price and Availability None. 3. ACCOMPLISHMENT INSTRUCTIONS A. General (1) For engine installed parts, do as follows: (a) Read the assembly and disassembly techniques section. Refer to the SPM, 70-10-00, ASSEMBLY AND DISASSEMBLY TECHNIQUES. (2) For shelf stock parts, do as follows: (a) Refer to step 3.B.(2). B. Identification (1) Identify the FCOC fuel cooling inlet tube hose (1, and FCOC fuel return hose manifold (2).Figure 1) (2) Locate the supplier marking on the FCOC fuel cooling inlet tube hose (1, and FCOC fuel return hose Figure 1) manifold (2) and do as follows: (a) If you find the supplier marking hose preform lot number 684141 and/or 677536, do as follows: 1 For engine installed parts: a Record the engine serial number (ESN) and contact GE through GE Aviation Fleet Support to report the part identification (part number, lot number, and manufacturing date) and ESN. Make reference to GEnx-1B S/B 73-0116 when you send this information. b Remove the affected FCOC fuel cooling inlet tube hose (1, and/or FCOC fuel return Figure 1) hose manifold (2) as specified in paragraph 3.C., Removal of FCOC Fuel Cooling Inlet Tube .Hose and FCOC Fuel Return Hose Manifold 2 For shelf stock parts: a Contact GE through GE Aviation Fleet Support to report the part identification (part number, lot number, and manufacturing date). Make reference to GEnx-1B S/B 73-0116 when you send this information. (b) If you do not find the supplier marking hose preform lot number 684141 and/or 677536, no action is necessary. C. Removal of FCOC Fuel Cooling Inlet Tube Hose and FCOC Fuel Return Hose Manifold (1) Remove the affected FCOC fuel cooling inlet tube hose (1, and/or FCOC fuel return hose manifold Figure 1) (2). Refer to the GEnx-1B EM, 72-00-02, DISASSEMBLY 003. D. Installation of FCOC Fuel Cooling Inlet Tube Hose and FCOC Fuel Return Hose Manifold (1) Install a new or serviceable FCOC fuel cooling inlet tube hose (1, and/or FCOC fuel return hose Figure 1) manifold (2). Refer to the GEnx-1B EM, 72-00-02, ASSEMBLY 004, CONFIG 01 or CONFIG 02 and 72-00- 05, INSTALLATION 001. ### Page 4 (OCR) GEnx-1B (LR) Service Bulletins (SBS) SB 73-0116 ROO ENGINE FUEL AND CONTROL - Fuel Tubes (73-11-41) - FCOC Fuel Return Hose Manifold and FCOC Fuel Cooling Inlet Tube Hose Inspection and Replacement SUPPLIER MARKING LOCATION SUPPLIER MARKING LOCATION TOP VIEW LEGEND: 1. FCOC FUEL COOLING INLET TUBE HOSE P/N 2426M08P01 2. FCOC FUEL RETURN HOSE MANIFOLD P/N 2426M07P01 6056963-00 FCOC Fuel Cooling Inlet Tube Hose and FCOC Fuel Return Hose Manifold Supplier Marking Location Figure 1 (Sheet 1) GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced Date Printed: 2025 without the express written consent of GE. Technical data is considered ITAR and/or EAR Page controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly 4 of 7 prohibited. ### Page 5 (OCR) GEnx-1B (LR) Service Bulletins (SBS) SB 73-0116 ROO ENGINE FUEL AND CONTROL - Fuel Tubes (73-11-41) - FCOC Fuel Return Hose Manifold and FCOC Fuel Cooling Inlet Tube Hose Inspection and Replacement SUPPLIER MARKING LOCATION 2 (REF) SUPPLIER MARKING LOCATION 1 (REF) FWD FWD RIGHT-SIDE VIEW LEFT-SIDE VIEW 6056964-00 FCOC Fuel Cooling Inlet Tube Hose and FCOC Fuel Return Hose Manifold Supplier Marking Location Figure 1 (Sheet 2) GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced Date Printed: 2025 without the express written consent of GE. Technical data is considered ITAR and/or EAR Page controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly 5 of7 prohibited. ### Page 6 (OCR) GEnx-1B (LR) Service Bulletins (SBS) SB 73-0116 ROO ENGINE FUEL AND CONTROL - Fuel Tubes (73-11-41) - FCOC Fuel Return Hose Manifold and FCOC Fuel Cooling Inlet Tube Hose Inspection and Replacement 1 (REF) SUPPLIER MARKING 0748250N2426M0 7P01 98441-A35302 L FUEL 12/8/5C8414) 677536 PT/A/55815 LOT NUMBER 6056965-00 FCOC Fuel Cooling Inlet Tube Hose and FCOC Fuel Return Hose Manifold Supplier Marking Location Figure 1 (Sheet 3) 4. APPENDIX - A GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced Date Printed: 2025 without the express written consent of GE. Technical data is considered ITAR and/or EAR Page controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly 60f7 prohibited. ### Page 7 (OCR) GEnx-1B (LR) Service Bulletins (SBS) SB 73-0116 ROO ENGINE FUEL AND CONTROL - Fuel Tubes (73-11-41) - FCOC Fuel Return Hose Manifold and FCOC Fuel Cooling Inlet Tube Hose Inspection and Replacement All GE warranty claims must have complete information includng: Date of compliance with this Service Bulletin Proof of replacement of affected part number(s), preform lotnumber identified Reference to GEnx-1B S/B 73-0116 GE reference D-3433-5HT This support is available until December 31, 2029. All clains must be submitted within 12 months of work completion and by December 31, 2030. The Industry Support offered in this Service Bulletin is cotingent on the customer having an active general terms agreement (GTA) for the applicable GE engine rodel. This offer may not be assigned or otherwise transferred to any other party without the writen consent of GE. The offer is extended to the customer based on unique facts and circumstances, whichthe customer hereby acknowledges to be non-precedent setting between the customer and GE. GE's comnitments in this Service Bulletin are subject to the terms and conditions of the current GTA betwen the customer and GE for the applicable GE engine model. By signing below, the customer agrees thatthe Industry Support offering provides an equitable resolution as it pertains to this Service Bulletin and the customer and its officers, agents, partners, subsidiaries, affiliates, successors and assignsforever release, waive and discharge GE, its officers, directors, parents, partners, affiliates, subsidiaies, employees, successors and assigns, from any and all liability solely with respect to subject matterf this Service Bulletin. This Service Bulletin shall not be construed by either party as an admission of lability nor a precedent for resolution for any potential disputes or claims other than subject matter of this Service Bulletin. If compensation becomes available to the customer under guarantees, warranty, Servie Bulletins, or other engine program consideration, the customer will not receive duplicate compmsation, but will receive the compensation most beneficial to customer through the single guarantee, waranty. Service Bulletin, or other engine program consideration. The terms and conditions of the custoners GTA are applicable and remain By signing below, the customer accepts the terms and conditins of this GEnx-1B S/B 73-0116. Please submit a signed copy with your warranty claim. Claimswill not be processed without signature. Duly accepted and agreed: Customer Name Signature Date Signed Printed Name and Title General Electric Company /s/ Brian A. Goller Signature November 04, 2025 Brian A. Goller, GEnx Fleet Program Manager Date Signed Printed Name and Title 6057957-00 Form Figure 2 GE Designated: - CONFIDENTIAL Subject to the restrictions on the media GE PROPRIETARY INFORMATION - Not to be used, disclosed to others or reproduced Date Printed: 2025 without the express written consent of GE. Technical data is considered ITAR and/or EAR Page /11/05 controlled; transfer of this data to a Non-US Person, without USG authorization, is strictly 7 of7 prohibited. --- 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.