{"abstract":"The FAA is superseding Airworthiness Directive (AD) 2023-01-04 for all Airbus Helicopters Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, AS355E, AS355F, AS355F1, AS355F2, AS355N, and AS355NP helicopters. AD 2023-01-04 required, for helicopters with certain part- numbered tail rotor head (TRH) spider pitch change units installed, inspecting the pitch change spider nut (nut) for correct installation; marking a 2 to 5 mm wide black paint index mark and repetitively inspecting the alignment of the marking; and performing additional inspections and corrective actions if necessary. Since the FAA issued AD 2023-01-04, new or more restrictive airworthiness limitations were issued, which terminated the requirement for the repetitive inspections of the black paint index marking. This AD requires the same actions as AD 2023-01-04, except for the repetitive black paint index marking inspections and prohibits installing certain parts unless certain requirements are met. The FAA is issuing this AD to address the unsafe condition on these products.","action":"Final rule.","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/2026/06/16/2026-12048.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 36083","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective July 21, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2025-5387","Project Identifier MCAI-2024-00399-R","Amendment 39-23337","AD 2026-09-15"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-5387-0005"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-5387-0003"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2026-06-16","updated_at":"2026-06-16T08:58:11.659-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2025-5387-0004","allow_late_comments":false,"id":"FAA-2025-5387-0004","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2025-5387","title":"MCAI-2024-00399-R; Airbus Helicopters AS350 Tail Rotor Head Pitch Change Unit Bearing Spacer"}],"document_number":"2026-12048","effective_on":"2026-07-21","end_page":36085,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/06/16/2026-12048.xml","html_url":"https://www.federalregister.gov/documents/2026/06/16/2026-12048/airworthiness-directives-airbus-helicopters","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-12048?publication_date=2026-06-16","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-06-16/2026-12048/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":106,"last_updated":"2026-06-18 20:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-06-16/pdf/2026-12048.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-12048.pdf?1781527511","publication_date":"2026-06-16","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/06/16/2026-12048.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-2025-5387-0005"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-5387-0003"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":0,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2025-5387","supporting_documents_count":2,"docket_id":"FAA-2025-5387","document_id":"FAA-2025-5387-0004","regulation_id_number":"2120-AA64","title":"MCAI-2024-00399-R; Airbus Helicopters AS350 Tail Rotor Head Pitch Change Unit Bearing Spacer","checked_regulationsdotgov_at":"2026-06-17T15:55:04Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":36083,"subtype":null,"title":"Airworthiness Directives; Airbus Helicopters","toc_doc":"Airbus Helicopters","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":91}