{"abstract":"The FAA is superseding Airworthiness Directive (AD) 2025-06- 51, which applied to certain Bell Textron Canada Limited (Bell) Model 505 helicopters. AD 2025-06-51 required removing all ballast weights from the aft movable ballast box assembly and prohibited the use of ballast weights within the aft movable ballast box assembly. Since the FAA issued AD 2025-06-51, Bell has developed a modification to the ballast box door assembly and the FAA has determined that the new actions would terminate the requirements of AD 2025-06-51. This AD requires installing the modification to the aft movable ballast box door assembly. The FAA is issuing this AD to address the unsafe condition on these products.","action":"Final rule; request for comments.","agencies":[{"raw_name":"DEPARTMENT OF TRANSPORTATION","name":"Transportation Department","id":492,"url":"https://www.federalregister.gov/agencies/transportation-department","json_url":"https://www.federalregister.gov/api/v1/agencies/492","parent_id":null,"slug":"transportation-department"},{"raw_name":"Federal Aviation Administration","name":"Federal Aviation Administration","id":159,"url":"https://www.federalregister.gov/agencies/federal-aviation-administration","json_url":"https://www.federalregister.gov/api/v1/agencies/159","parent_id":492,"slug":"federal-aviation-administration"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2025/11/05/2025-19785.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"90 FR 49248","comment_url":null,"comments_close_on":"2025-12-22","correction_of":null,"corrections":[],"dates":"This AD is effective November 20, 2025.","disposition_notes":null,"docket_ids":["Docket No. FAA-2025-3996","Project Identifier MCAI-2025-01201-R","Amendment 39-23181","AD 2025-22-03"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-3996-0002"}],"agency_name":"FAA","documents":[{"comment_count":1,"comment_start_date":"2025-11-05","updated_at":"2025-12-23T00:05:59.767-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2025-3996-0001","allow_late_comments":false,"id":"FAA-2025-3996-0001","comment_end_date":"2025-12-23","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2025-3996","title":"MCAI-2025-01201-R; Bell Textron Canada Limited 505 Levelling and Weighing – Aft Moveable Ballast Box Assembly Door Hinge Failure"}],"document_number":"2025-19785","effective_on":"2025-11-20","end_page":49251,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2025/11/05/2025-19785.xml","html_url":"https://www.federalregister.gov/documents/2025/11/05/2025-19785/airworthiness-directives-bell-textron-canada-limited-helicopters","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2025-19785?publication_date=2025-11-05","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2025-11-05/2025-19785/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":978,"last_updated":"2026-07-25 20:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2025-11-05/pdf/2025-19785.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2025-19785.pdf?1762177508","publication_date":"2025-11-05","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2025/11/05/2025-19785.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202504","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202504&RIN=2120-AA64&operation=OPERATION_EXPORT_XML","priority_category":"Routine and Frequent"}},"regulation_id_numbers":["2120-AA64"],"regulations_dot_gov_info":{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-3996-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":1,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2025-3996","supporting_documents_count":1,"docket_id":"FAA-2025-3996","document_id":"FAA-2025-3996-0001","regulation_id_number":"2120-AA64","title":"MCAI-2025-01201-R; Bell Textron Canada Limited 505 Levelling and Weighing – Aft Moveable Ballast Box Assembly Door Hinge Failure","checked_regulationsdotgov_at":"2025-12-23T05:05:58Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":49248,"subtype":null,"title":"Airworthiness Directives; Bell Textron Canada Limited Helicopters","toc_doc":"Bell Textron Canada Limited Helicopters","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":90}