{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain Airbus Canada Limited Partnership Model BD-500-1A10 and BD-500- 1A11 airplanes. This AD was prompted by the discovery that titanium fasteners had been incorrectly installed in the butt strap at the outer wing box lower skin to center wing box interface in lieu of the correct nickel alloy fasteners. This AD requires the identification of fasteners installed in the butt strap at the outer wing box lower skin to center wing box interface, and applicable on-condition 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/2026/05/27/2026-10486.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 31341","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective July 1, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2025-2543","Project Identifier MCAI-2025-00215-T","Amendment 39-23347","AD 2026-10-07"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-2543-0007"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-2543-0002"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2026-05-27","updated_at":"2026-05-27T08:58:56.221-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2025-2543-0006","allow_late_comments":false,"id":"FAA-2025-2543-0006","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2025-2543","title":"MCAI-2025-00215-T; Airbus Canada Limited Partnership Model BD-500-1A10; BD-500-1A11 series airplanes; butt strap fasteners at the outer wing box lower skin to center wing box interface"}],"document_number":"2026-10486","effective_on":"2026-07-01","end_page":31345,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/05/27/2026-10486.xml","html_url":"https://www.federalregister.gov/documents/2026/05/27/2026-10486/airworthiness-directives-airbus-canada-limited-partnership-type-certificate-previously-held-by-c","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-10486?publication_date=2026-05-27","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-05-27/2026-10486/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":129,"last_updated":"2026-07-26 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-05-27/pdf/2026-10486.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-10486.pdf?1779799513","publication_date":"2026-05-27","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/05/27/2026-10486.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-2025-2543-0007"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-2543-0002"}],"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-2025-2543","supporting_documents_count":2,"docket_id":"FAA-2025-2543","document_id":"FAA-2025-2543-0006","regulation_id_number":"2120-AA64","title":"MCAI-2025-00215-T; Airbus Canada Limited Partnership Model BD-500-1A10; BD-500-1A11 series airplanes; butt strap fasteners at the outer wing box lower skin to center wing box interface","checked_regulationsdotgov_at":"2026-06-09T16:07:25Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":31341,"subtype":null,"title":"Airworthiness Directives; Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes","toc_doc":"Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":91}