{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model AS350B2 helicopters. This AD was prompted by a report of magnetization on the solenoid valves for the three main servo-controls, the regulator block, and the tail servo- control due to a diode not properly installed in the hydraulic circuit. This AD requires performing a cut-off test of the rear rotor actuator valve and, depending on the results of the test, performing corrective actions. 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/2026/08/13/2026-16507.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 52221","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective September 17, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2026-4646","Project Identifier MCAI-2025-01763-R","Amendment 39-23435","AD 2026-16-05"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2026-4646-0004"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2026-4646-0002"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2026-08-13","updated_at":"2026-08-13T09:01:06.260-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2026-4646-0003","allow_late_comments":false,"id":"FAA-2026-4646-0003","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2026-4646","title":"MCAI-2025-01763-R; Airbus Helicopters Model AS350B2 Helicopters; ATA 29 – Hydraulic Power – Single Generation Hydraulic System Wiring Diode – Cut-Off Test"}],"document_number":"2026-16507","effective_on":"2026-09-17","end_page":52223,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/08/13/2026-16507.xml","html_url":"https://www.federalregister.gov/documents/2026/08/13/2026-16507/airworthiness-directives-airbus-helicopters","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-16507?publication_date=2026-08-13","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-08-13/2026-16507/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":208,"last_updated":"2026-09-20 10:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-08-13/pdf/2026-16507.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-16507.pdf?1786538714","publication_date":"2026-08-13","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/08/13/2026-16507.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-2026-4646-0004"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2026-4646-0002"}],"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-2026-4646","supporting_documents_count":2,"docket_id":"FAA-2026-4646","document_id":"FAA-2026-4646-0003","regulation_id_number":"2120-AA64","title":"MCAI-2025-01763-R; Airbus Helicopters Model AS350B2 Helicopters; ATA 29 – Hydraulic Power – Single Generation Hydraulic System Wiring Diode – Cut-Off Test","checked_regulationsdotgov_at":"2026-08-14T15:55:10Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":52221,"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}