{"abstract":"The FAA is adopting a new airworthiness directive (AD) for all DG Aviation GmbH (Type Certificate Previously Held by DG Flugzeugbau GmbH) Model DG-1000M gliders. This AD was prompted by reports of engine mount cracking near the propeller head. This AD requires updating the maintenance manual, inspecting the engine mount for cracks, and taking corrective actions if cracks are found. This AD also requires performing a powerplant belt tension inspection and, depending on the results of the inspection, adjusting the belt tension. This AD also requires balancing the propeller assembly and installing a carbon fiber reinforced plastic (CFRP) bracket. This AD also prohibits accomplishing certain maintenance actions in the maintenance manual. 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/2026/04/03/2026-06534.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 16815","comment_url":"http://www.regulations.gov/commenton/FAA-2026-2727-0001","comments_close_on":"2026-05-18","correction_of":null,"corrections":[],"dates":"This AD is effective April 20, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2026-2727","Project Identifier MCAI-2025-00685-G","Amendment 39-23298","AD 2026-07-03"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2026-2727-0002"}],"agency_name":"FAA","documents":[{"comment_count":1,"comment_start_date":"2026-04-03","updated_at":"2026-04-04T01:56:39.068-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2026-2727-0001","allow_late_comments":false,"id":"FAA-2026-2727-0001","comment_end_date":"2026-05-19","regulations_dot_gov_open_for_comment":true}],"supporting_documents_count":1,"id":"FAA-2026-2727","title":"MCAI-2025-00685-G; DG AVIATION GmbH DG-1000M powered sailplanes; ATA 71 –Engine Support Frame – Inspections / Modification, ATA 61 –Propeller Assembly – Balancing, ATA 73 – Powerplant Controllers Software – Modification"}],"document_number":"2026-06534","effective_on":"2026-04-20","end_page":16818,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/04/03/2026-06534.xml","html_url":"https://www.federalregister.gov/documents/2026/04/03/2026-06534/airworthiness-directives-dg-aviation-gmbh-type-certificate-previously-held-by-dg-flugzeugbau-gmbh","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-06534?publication_date=2026-04-03","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-04-03/2026-06534/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":106,"last_updated":"2026-04-10 22:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-04-03/pdf/2026-06534.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-06534.pdf?1775133915","publication_date":"2026-04-03","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/04/03/2026-06534.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-2026-2727-0002"}],"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-2026-2727","supporting_documents_count":1,"docket_id":"FAA-2026-2727","document_id":"FAA-2026-2727-0001","regulation_id_number":"2120-AA64","title":"MCAI-2025-00685-G; DG AVIATION GmbH DG-1000M powered sailplanes; ATA 71 –Engine Support Frame – Inspections / Modification, ATA 61 –Propeller Assembly – Balancing, ATA 73 – Powerplant Controllers Software – Modification","checked_regulationsdotgov_at":"2026-04-05T08:55:04Z"},"regulations_dot_gov_url":"http://www.regulations.gov/commenton/FAA-2026-2727-0001","significant":false,"signing_date":null,"start_page":16815,"subtype":null,"title":"Airworthiness Directives; DG Aviation GmbH (Type Certificate Previously Held by DG Flugzeugbau GmbH) Gliders","toc_doc":"DG Aviation GmbH (Type Certificate Previously Held by DG Flugzeugbau GmbH) Gliders","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":91}