{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain Bell Textron Canada Limited (Bell) Model 429 helicopters. This AD was prompted by reports of tail rotor gearbox assemblies found loose on the gearbox support. This AD requires repetitive torque checks of the tail rotor gearbox attachment hardware, and corrective action if necessary. 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/2021/09/27/2021-20829.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"86 FR 53203","comment_url":"https://www.regulations.gov/commenton/FAA-2021-0513-0003","comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective November 1, 2021.","disposition_notes":null,"docket_ids":["Docket No. FAA-2021-0513","Project Identifier 2018-SW-116-AD","Amendment 39-21717","AD 2021-18-16"],"dockets":[{"supporting_documents":[{"title":"Supporting AD Document","document_id":"FAA-2021-0513-0004"},{"title":"Supporting AD Documents","document_id":"FAA-2021-0513-0002"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2021-09-27","updated_at":"2024-11-06T20:47:00.061-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2021-0513-0003","allow_late_comments":true,"id":"FAA-2021-0513-0003","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2021-0513","title":"Bell Textron Canada Limited (Bell) Model 429 helicopters; TRGB support inspection"}],"document_number":"2021-20829","effective_on":"2021-11-01","end_page":53205,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2021/09/27/2021-20829.xml","html_url":"https://www.federalregister.gov/documents/2021/09/27/2021-20829/airworthiness-directives-bell-textron-canada-limited-type-certificate-previously-held-by-bell","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2021-20829?publication_date=2021-09-27","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2021-09-27/2021-20829/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":356,"last_updated":"2026-09-22 10:15:08 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2021-09-27/pdf/2021-20829.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2021-20829.pdf?1632487528","publication_date":"2021-09-27","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2021/09/27/2021-20829.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 Document","document_id":"FAA-2021-0513-0004"},{"title":"Supporting AD Documents","document_id":"FAA-2021-0513-0002"}],"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-2021-0513","supporting_documents_count":2,"docket_id":"FAA-2021-0513","document_id":"FAA-2021-0513-0003","regulation_id_number":"2120-AA64","title":"Bell Textron Canada Limited (Bell) Model 429 helicopters; TRGB support inspection","checked_regulationsdotgov_at":"2024-11-07T23:55:14Z"},"regulations_dot_gov_url":"https://www.regulations.gov/commenton/FAA-2021-0513-0003","significant":false,"signing_date":null,"start_page":53203,"subtype":null,"title":"Airworthiness Directives; Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited) Helicopters","toc_doc":"Bell Textron Canada Limited (Type Certificate Previously Held by Bell Helicopter Textron Canada Limited) Helicopters","toc_subject":"Airworthiness Directives:\n","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":86}