{"abstract":"The FAA proposes to adopt a new airworthiness directive (AD) for all Columbia Helicopters, Inc. Model 234 helicopters and all Restricted Category Model CH-47D helicopters. This proposed AD was prompted by reports of corrosion detected on certain flight control rigid connecting links (connecting link). This proposed AD would require repetitive borescope inspections of the connecting links for corrosion and, depending on the results of the inspection, repair of the corrosion or replacement of the connecting link with a serviceable part. This proposed AD would also require reporting the results of these inspections and would prohibit installing a certain part-numbered connecting link or a connecting link with an unknown part number on a helicopter unless certain requirements are met. The FAA is proposing this AD to address the unsafe condition on these products.","action":"Notice of proposed rulemaking (NPRM).","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/2026/04/14/2026-07218.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 19087","comment_url":"http://www.regulations.gov/commenton/FAA-2026-3483-0001","comments_close_on":"2026-05-29","correction_of":null,"corrections":[],"dates":"The FAA must receive comments on this proposed AD by May 29, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2026-3483","Project Identifier AD-2024-00454-R"],"dockets":[{"supporting_documents":[],"agency_name":"FAA","documents":[{"comment_count":1,"comment_start_date":"2026-04-14","updated_at":"2026-05-01T01:57:08.376-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2026-3483-0001","allow_late_comments":false,"id":"FAA-2026-3483-0001","comment_end_date":"2026-05-30","regulations_dot_gov_open_for_comment":true}],"supporting_documents_count":0,"id":"FAA-2026-3483","title":"AD-2024-00454-R; Columbia Helicopters, Inc. and Restricted Category Model CH-47D Helicopters; Connecting links - Corrorsion Inspection, repair/replacement"}],"document_number":"2026-07218","effective_on":null,"end_page":19089,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/14/2026-07218.xml","html_url":"https://www.federalregister.gov/documents/2026/04/14/2026-07218/airworthiness-directives-columbia-helicopters-inc-and-restricted-category-model-ch-47d-helicopters","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-07218?publication_date=2026-04-14","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-14/2026-07218/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":109,"last_updated":"2026-05-25 12:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-14/pdf/2026-07218.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-07218.pdf?1776084322","publication_date":"2026-04-14","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/14/2026-07218.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":[],"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-2026-3483","supporting_documents_count":0,"docket_id":"FAA-2026-3483","document_id":"FAA-2026-3483-0001","regulation_id_number":"2120-AA64","title":"AD-2024-00454-R; Columbia Helicopters, Inc. and Restricted Category Model CH-47D Helicopters; Connecting links - Corrorsion Inspection, repair/replacement","checked_regulationsdotgov_at":"2026-05-02T04:55:03Z"},"regulations_dot_gov_url":"http://www.regulations.gov/commenton/FAA-2026-3483-0001","significant":false,"signing_date":null,"start_page":19087,"subtype":null,"title":"Airworthiness Directives; Columbia Helicopters, Inc. and Restricted Category Model CH-47D Helicopters","toc_doc":"Columbia Helicopters, Inc. and Restricted Category Model CH47D Helicopters","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":91}