{"abstract":"The FAA is adopting a new airworthiness directive (AD) for all Airbus Helicopters Deutschland GmbH (AHD) Helicopters Model MBB-BK 117 D-3 helicopters. The FAA previously sent this AD as an emergency AD to all known U.S. owners and operators of these helicopters. This AD was prompted by a report of a crack on the affected part, which was detected after the crew reported increased vibration of the helicopter. This AD requires inspecting the rotor hub-shaft for a crack and depending on the inspection results, replacing any rotor hub-shaft that has any cracks and reporting information after accomplishment of the replacement. This AD also prohibits installing any affected rotor hub- shaft on any helicopter, unless certain requirements are met. The FAA is issuing this AD to address the unsafe condition on these products.","action":"Final rule; request for comments.","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/2026/04/29/2026-08324.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 22995","comment_url":"http://www.regulations.gov/commenton/FAA-2026-3867-0001","comments_close_on":"2026-06-15","correction_of":null,"corrections":[],"dates":"This AD is effective May 14, 2026. Emergency AD 2026-08-51, issued on April 16, 2026, which contained the requirements of this amendment, was effective with actual notice.","disposition_notes":null,"docket_ids":["Docket No. FAA-2026-3867","Project Identifier MCAI-2026-00403-R","Amendment 39-23249","AD 2026-08-51"],"dockets":[{"supporting_documents":[],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2026-04-29","updated_at":"2026-04-29T09:58:40.771-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2026-3867-0001","allow_late_comments":false,"id":"FAA-2026-3867-0001","comment_end_date":"2026-06-16","regulations_dot_gov_open_for_comment":true}],"supporting_documents_count":0,"id":"FAA-2026-3867","title":"MCAI-2026-00403-R; Airbus Helicopters Deutschland GmbH Model MBB-BK 117 D-3 Helicopters; ATA 63 – Main Rotor Drive – Rotor Hub-Shaft – Inspection"}],"document_number":"2026-08324","effective_on":"2026-05-14","end_page":22998,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/29/2026-08324.xml","html_url":"https://www.federalregister.gov/documents/2026/04/29/2026-08324/airworthiness-directives-airbus-helicopters-deutschland-gmbh-ahd-helicopters","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-08324?publication_date=2026-04-29","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-29/2026-08324/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":180,"last_updated":"2026-06-12 20:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-29/pdf/2026-08324.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-08324.pdf?1777380319","publication_date":"2026-04-29","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/29/2026-08324.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":0,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2026-3867","supporting_documents_count":0,"docket_id":"FAA-2026-3867","document_id":"FAA-2026-3867-0001","regulation_id_number":"2120-AA64","title":"MCAI-2026-00403-R; Airbus Helicopters Deutschland GmbH Model MBB-BK 117 D-3 Helicopters; ATA 63 – Main Rotor Drive – Rotor Hub-Shaft – Inspection","checked_regulationsdotgov_at":"2026-04-30T11:55:07Z"},"regulations_dot_gov_url":"http://www.regulations.gov/commenton/FAA-2026-3867-0001","significant":false,"signing_date":null,"start_page":22995,"subtype":null,"title":"Airworthiness Directives; Airbus Helicopters Deutschland GmbH (AHD) Helicopters","toc_doc":"Airbus Helicopters Deutschland GmbH (AHD) Helicopters","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":91}