{"abstract":"The FAA is adopting a new airworthiness directive (AD) for Leonardo S.p.a. (Type Certificate previously held by Agusta S.p.A.) Model AB139 and AW139 helicopters and Leonardo S.p.a. (Type Certificate previously held by AgustaWestland S.p.A.) Model AW189 helicopters. This AD was prompted by reports of missing lock wire and loose fasteners. This AD requires a one-time inspection of the main rotor (M/R) slip ring and depending on the outcome, removing the M/R slip ring from service, removing screws and washers from service, applying torque, installing lock wire, and re-identifying the M/R slip ring. This AD also prohibits the installation of certain M/R slip rings. 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/2021/06/29/2021-13711.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"86 FR 34127","comment_url":"https://www.regulations.gov/commenton/FAA-2021-0304-0003","comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective August 3, 2021.","disposition_notes":null,"docket_ids":["Docket No. FAA-2021-0304","Project Identifier 2017-SW-108-AD","Amendment 39-21606","AD 2021-13-01"],"dockets":[{"supporting_documents":[{"title":"Supporting AD Documents","document_id":"FAA-2021-0304-0004"},{"title":"Supporting AD Documents","document_id":"FAA-2021-0304-0002"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2021-06-29","updated_at":"2024-11-06T20:43:04.565-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2021-0304-0003","allow_late_comments":true,"id":"FAA-2021-0304-0003","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2021-0304","title":"2020-NM-XXX-AD"}],"document_number":"2021-13711","effective_on":"2021-08-03","end_page":34130,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2021/06/29/2021-13711.xml","html_url":"https://www.federalregister.gov/documents/2021/06/29/2021-13711/airworthiness-directives-leonardo-spa-type-certificates-previously-held-by-agusta-spa-and","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2021-13711?publication_date=2021-06-29","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2021-06-29/2021-13711/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":278,"last_updated":"2026-08-23 22:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2021-06-29/pdf/2021-13711.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2021-13711.pdf?1624884322","publication_date":"2021-06-29","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2021/06/29/2021-13711.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":"Supporting AD Documents","document_id":"FAA-2021-0304-0004"},{"title":"Supporting AD Documents","document_id":"FAA-2021-0304-0002"}],"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-2021-0304","supporting_documents_count":2,"docket_id":"FAA-2021-0304","document_id":"FAA-2021-0304-0003","regulation_id_number":"2120-AA64","title":"2020-NM-XXX-AD","checked_regulationsdotgov_at":"2024-11-07T23:00:19Z"},"regulations_dot_gov_url":"https://www.regulations.gov/commenton/FAA-2021-0304-0003","significant":false,"signing_date":null,"start_page":34127,"subtype":null,"title":"Airworthiness Directives; Leonardo S.p.a. (Type Certificates Previously Held by Agusta S.p.A. and AgustaWestland S.p.A.) Helicopters","toc_doc":"Leonardo S.p.a. (Type Certificates Previously Held by Agusta S.p.A. and AgustaWestland S.p.A.) Helicopters","toc_subject":"Airworthiness Directives:\n","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":86}