{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and - 402 airplanes. This AD was prompted by multiple in-service reports of cracks in elevator power control unit (PCU) brackets (fittings) and the elevator front spar. This AD requires replacing bushings and installing new washers on the elevator PCU arm fitting assembly, installing doublers at the front spar of the elevator structure assembly, replacing horizontal stabilizer rear spar elevator PCU fittings, and applicable on-conditions 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/2026/04/29/2026-08303.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 23009","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective June 3, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2025-5402","Project Identifier MCAI-2025-00425-T","Amendment 39-23315","AD 2026-08-07"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-5402-0005"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2025-5402-0002"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2026-04-29","updated_at":"2026-04-29T10:02:25.766-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2025-5402-0004","allow_late_comments":false,"id":"FAA-2025-5402-0004","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2025-5402","title":"MCAI-2025-00425-T; DeHavilland Aircraft of Canada Limited DHC-8-401 and DHC-8-402 airplanes; Stabilizers – Elevator Power Control Unit (PCU) Bracket and Elevator Front Spar Cracks"}],"document_number":"2026-08303","effective_on":"2026-06-03","end_page":23011,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/29/2026-08303.xml","html_url":"https://www.federalregister.gov/documents/2026/04/29/2026-08303/airworthiness-directives-de-havilland-aircraft-of-canada-limited-type-certificate-previously-held-by","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-08303?publication_date=2026-04-29","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-29/2026-08303/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":73,"last_updated":"2026-05-04 10:15:06 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-29/pdf/2026-08303.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-08303.pdf?1777380316","publication_date":"2026-04-29","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/29/2026-08303.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-2025-5402-0002"}],"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-2025-5402","supporting_documents_count":1,"docket_id":"FAA-2025-5402","document_id":"FAA-2025-5402-0004","regulation_id_number":"2120-AA64","title":"MCAI-2025-00425-T; DeHavilland Aircraft of Canada Limited DHC-8-401 and DHC-8-402 airplanes; Stabilizers – Elevator Power Control Unit (PCU) Bracket and Elevator Front Spar Cracks","checked_regulationsdotgov_at":"2026-04-30T11:55:07Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":23009,"subtype":null,"title":"Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes","toc_doc":"De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":91}