# Gulfstream Service Bulletin CB-500-089: No revision named - Rights: © Gulfstream Aerospace Corporation. Filed by the FAA in regulations.gov docket FAA-2024-2021, the docket of AD 2024-25-03. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Gulfstream Service Bulletin CB-500-089](https://openairdocs.org/service-documents/gulfstream/cb500-089.md) - Title as filed: CB-500-089 - Pages: 6 - PDF: https://openairdocs.org/files/sha256/3a/e9/3ae9bc87b41b723fd06f8c50436e90dd1a0b2a610c837e01eb38290d9ff3a36b - Page: https://openairdocs.org/service-documents/gulfstream/cb500-089/file/3ae9bc87b41b ## Text Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 CUSTOMER BULLETIN No. 089 SUBJECT FUEL (ATA 28) SEALANT APPLICATION – OVERWING GROUNDING RECEPTACLE (ASC 064) Initial Issue November 28, 2023 ### Page 2 CUSTOMER BULLETIN November 28, 2023 Customer Bulletin No. 089 Page 1 of 4 Fuel (ATA 28), Sealant Application – Overwing Grounding Receptacle (ASC 064) I. Planning Information: A. Effectivity: Aircraft serial numbers 72001 through 72139 B. Concurrent Requirements: This customer bulletin requires incorporation of GVII -G500 Aircraft Service Change (ASC) 064, Fuel (ATA 28) Overwing Grounding Receptacle Sealant Application. C. Reason: Several instances of cracking/fracturing of the overwing electrical grounding receptacles have been discovered in the GVII fleet. Investigation of the failed receptacles determined that the cracking/fracturing was initiated by the collection of water in the grounding receptacle leading to corrosion and mechanical stresses from water freeze/thaw cycles. Failure of the grounding receptacle presents an unsafe condition during overwing (gravity) refueling operation, and can result in fuel leaking from the receptacles. To address this condition, Gulfstream has developed ASC 064, Fuel (ATA 28) Overwing Grounding Receptacle Sealant Application, which inspects for and corrects any signs of grounding receptacle corrosion or damage , and applies sealant over the top surface to completely remove the grounding receptacle functionality. D. Safety Intent: The safety intent of this CB is to prevent the possibility of a fire or fuel tank explosion during overwing (gravity) refueling as the result of a failed overwing grounding receptacle. NOTE: The Aircraft Maintenance Manual (AMM) refueling procedure has been revised to instruct operators / maintenance personal to use the grounding receptacle located at the Ground Service Control Panel (GSCP) while performing overwing gravity refueling. Use of the G SCP grounding receptacle per GVII -G500 AMM 12 -13-01, Revision 14, eliminates the fire / explosion hazard associated with using a failed overwing grounding receptacle during gravity refueling operations. E. Configuration Description: I ncorporating ASC 064 will result in sealing ov er the top surface of the overwing grounding receptacle to completely remove its functionality and physically prevent its us e during overwing (gravity) refueling operations. F. Description: This customer bulletin is a one -time action to incorporate GVII -G500 ASC 0 64, Fuel (ATA 28) Overwing Grounding Receptacle Sealant Application, initial issue dated November 28, 2023. G. Compliance: Compliance with this customer bulletin is required within 36 months from the initial issue date of November 28, 2023. This CB is part of a managed program. Incorporation must be coordinated through your Gulfstream Regional Sales Manager (RSM) or call Gulfstream Scheduling at 800- 810-GULF (4853) or 912- 965-4178. If not scheduled, down times and associated costs could increase significantly. NOTE: M anagement of programs may be discontinued when constrained scheduling or management of parts are no longer required. ### Page 3 CUSTOMER BULLETIN November 28, 2023 Customer Bulletin No. 089 Page 2 of 4 H. Approval: The engineering aspects of this customer bulletin have been reviewed and approved by the Federal Aviation Administration, and are the subject of pending Airworthiness Directive regulatory action. I. Labor Requirements: Refer to ASC 064 J. Weight and Balance: Refer to ASC 064 K. References: Aircraft Maintenance Manual (AMM), Chapters 20 and 28 GVII-G500 ASC 064, Fuel (ATA 28) Overwing Grounding Receptacle Sealant Application, initial issue dated November 28, 2023 NOTE: A ll references in this document are intended to be inclusive of any amendments or revisions unless otherwise stated. L. Publications Affected: R efer to ASC 064 ### Page 4 CUSTOMER BULLETIN November 28, 2023 Customer Bulletin No. 089 Page 3 of 4 II. Material Information: A. Material - Availability: Refer to ASC 064 B. Warranty Coverage: Labor and material will be at no charge regardless of warranty status if work is accomplished within the recommended compliance time, as stated in this document, at a Gulfstream GVII-G500 Authorized Warranty Facility or Factory Authorized Service Center. Coverage is granted per the terms and conditions of the Gulfstream Aircraft Sales Agreement to the original purchaser or subsequent owner with appropriate Assignment of Warranties on file with Gulfstream. NOTE: A dditional labor hours incurred due to aircraft configuration or mechanical difficulties must be charged as a separate discrepancy and submitted for warranty consideration. C. Material N ecessary for Each Aircraft: 1. Material to be Procured Refer to ASC 064 2. Material Supplied by Operator Refer to ASC 064 D. Re-identified Parts: Refer to ASC 064 E. Special Equipment / Tools Required: Refer to ASC 064 ### Page 5 CUSTOMER BULLETIN November 28, 2023 Customer Bulletin No. 089 Page 4 of 4 III. Accomplishment Instructions: CAUTION: PROTECT WIRE BUNDLES, CONNECTORS AND SURROUNDING STRUCTURE DURING ANY MAINTENANCE PROCEDURE FROM SHAVINGS, DEBRIS AND CONTAMINATION. MAINTAIN A PROPERLY CLEANED WORK AREA THROUGHOUT THE PROCEDURE TO ENSURE THE INTEGRITY OF THE AFFECTED COMPONENT / SYSTEM. VISUALLY INSPECT WORK AREA USING ADDITIONAL LIGHT AS NECESSARY TO VERIFY ABSENCE OF ANY DEBRIS PRIOR TO COMPLETION OF PROCEDURE. FAILURE TO COMPLY MAY RESULT IN DAMAGE TO COMPONENTS AND / OR SYSTEMS. NOTE: This aircraft is certified as Electrical Wiring In terconnection System (EWIS) compliant; as such, deviations from the approved electrical wiring installation(s) must comply with Advisory Circular (AC) 25.1701-1 and be approved by a properly FAA/EASA delegated EWIS engineering representative. NOTE: Some s teps in the accomplishment instructions are identified as Required for Compliance (RC). If this CB is mandated by an airworthiness directive (AD), the steps identified as RC must be done to comply with the AD. Steps not identified with RC are recommended and may be deviated from, done as part of other actions, or done with accepted methods different from those given in the CB, if the RC steps can be done and the aircraft can be returned to a serviceable condition. A. Prepare the aircraft for safe maintenance. Refer to AMM, Safe Ground Maintenance Procedure, Chapter 20. B. (RC) Incorporate GVII-G500 ASC 064, Fuel (ATA 28) Overwing Grounding Receptacle Sealant Application, initial issue dated November 28, 2023. C. Ensure work area is clean and clear of foreign objects (FOD). D. Record compliance with this customer bulletin in the aircraft permanent maintenance records and return aircraft to flight status. E. Report compliance with this customer bul letin to Gulfstream Computerized Maintenance Program (CMP) by uploading the attached service reply card, along with the CMP task card(s) sign- off using MyGulfstream, MyCMP Document Upload, e-mail to fax @campsystems.com or fax to Gulfstream CMP at 800-944-1775 or 912-963-0265. If technical assistance is required, contact your area Gulfstream Field Service Representative or call Gulfstream Customer Support at 800-810-GULF (4853) or 912-965-4178. ### Page 6 CUSTOMER BULLETIN PROPRIETARY NOTICE: These materials include proprietary information and data of Gulfstream Aerospace Corporation. Unauthorized distribution is strictly prohibited. © 2023 Gulfstream Aerospace Corporation. All rights reserved. EAR EXPORT CONTROLLED WARNING: This document contains technical data that is subject to U.S. Export Controls. Release to foreign persons, export transfer or re-export of this technical data requires approval from the Department of Commerce. SERVICE REPLY CARD Please upload this page, along with the CMP task card(s) sign- off using MyGulfstream, MyCMP Document Upload, e-mail to fax@campsystems.com or fax to Gulfstream CMP at 800-944-1775 or 912-963-0265. THE FOLLOWING CUSTOMER BULLETIN HAS BEEN COMPLIED WITH: Aircraft Hours Aircraft Landings This Customer Bulletin is not applicable because: Serial Number not affected Equipment not installed ______Previously complied with (annotate method of compliance below) ______Other (explain reason below) Signature Title/Certificate Number Company Comments / Suggestions: CB NO. CMP CODE ACFT SERIAL NO. COMPLIANCE DATE 089 980890.000 --- 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.