{"abstract":"The FAA proposes to adopt a new airworthiness directive (AD) for all Stemme GmbH (Stemme) Model Stemme S 12 gliders. This proposed AD was prompted by reports of fuel leaking around certain copper sealing rings within the fuel system. This proposed AD would require repetitive visual checks of the fuel system for fuel leakage, and replacement of the affected copper sealing ring. This proposed AD would also prohibit the installation of affected parts. 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/2026/05/15/2026-09801.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 27876","comment_url":null,"comments_close_on":"2026-06-29","correction_of":null,"corrections":[],"dates":"The FAA must receive comments on this NPRM by June 29, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2026-4637","Project Identifier MCAI-2025-01226-G"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2026-4637-0004"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2026-4637-0002"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2026-05-15","updated_at":"2026-06-30T00:07:56.054-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2026-4637-0001","allow_late_comments":false,"id":"FAA-2026-4637-0001","comment_end_date":"2026-06-30","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2026-4637","title":"MCAI-2025-01226-G; Stemme GmbH Model S 12 Gliders; ATA 28 – Fuel – Fuel Pump Set and Drainer Assembly / Copper Sealing – Replacement"}],"document_number":"2026-09801","effective_on":null,"end_page":27878,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/05/15/2026-09801.xml","html_url":"https://www.federalregister.gov/documents/2026/05/15/2026-09801/airworthiness-directives-stemme-gmbh-gliders","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-09801?publication_date=2026-05-15","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-05-15/2026-09801/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":119,"last_updated":"2026-08-26 06:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-05-15/pdf/2026-09801.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-09801.pdf?1778762725","publication_date":"2026-05-15","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/05/15/2026-09801.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-2026-4637-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2126-AA64/certification-of-safety-auditors-safety-investigators-and-safety-inspectors","title":"Certification of Safety Auditors, Safety Investigators, and Safety Inspectors"},"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-2026-4637","supporting_documents_count":1,"docket_id":"FAA-2026-4637","document_id":"FAA-2026-4637-0001","regulation_id_number":"2126-AA64","title":"MCAI-2025-01226-G; Stemme GmbH Model S 12 Gliders; ATA 28 – Fuel – Fuel Pump Set and Drainer Assembly / Copper Sealing – Replacement","checked_regulationsdotgov_at":"2026-06-30T04:07:55Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":27876,"subtype":null,"title":"Airworthiness Directives; Stemme GmbH Gliders","toc_doc":"Stemme GmbH Gliders","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":91}