{"abstract":"The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP-1A, LEAP-1B, and LEAP-1C engines. This proposed AD was prompted by a manufacturer investigation that revealed a quality escape for low-pressure turbine (LPT) disks made from forgings with nonconforming grain size. This proposed AD would require removal and replacement of the LPT stage 4 and stage 5 disks. 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/2024/11/08/2024-25869.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"89 FR 88681","comment_url":"http://www.regulations.gov/commenton/FAA-2024-2424-0001","comments_close_on":"2024-12-23","correction_of":null,"corrections":[],"dates":"The FAA must receive comments on this proposed AD by December 23, 2024.","disposition_notes":null,"docket_ids":["Docket No. FAA-2024-2424","Project Identifier AD-2024-00416-E"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2024-2424-0005"}],"agency_name":"FAA","documents":[{"comment_count":2,"comment_start_date":"2024-11-08","updated_at":"2024-12-24T00:01:19.166-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2024-2424-0001","allow_late_comments":true,"id":"FAA-2024-2424-0001","comment_end_date":"2024-12-24","regulations_dot_gov_open_for_comment":true}],"supporting_documents_count":1,"id":"FAA-2024-2424","title":"AD-2024-00416-E; CFM International, S.A. Model LEAP-1A, LEAP-1B, and LEAP-1C engines; LPT Disks - Removal"}],"document_number":"2024-25869","effective_on":null,"end_page":88683,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2024/11/08/2024-25869.xml","html_url":"https://www.federalregister.gov/documents/2024/11/08/2024-25869/airworthiness-directives-cfm-international-sa-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2024-25869?publication_date=2024-11-08","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2024-11-08/2024-25869/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":161,"last_updated":"2026-04-04 14:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2024-11-08/pdf/2024-25869.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2024-25869.pdf?1730987200","publication_date":"2024-11-08","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2024/11/08/2024-25869.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202410","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202410&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-2024-2424-0005"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":2,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2024-2424","supporting_documents_count":1,"docket_id":"FAA-2024-2424","document_id":"FAA-2024-2424-0001","regulation_id_number":"2120-AA64","title":"AD-2024-00416-E; CFM International, S.A. Model LEAP-1A, LEAP-1B, and LEAP-1C engines; LPT Disks - Removal","checked_regulationsdotgov_at":"2025-03-08T05:05:55Z"},"regulations_dot_gov_url":"http://www.regulations.gov/commenton/FAA-2024-2424-0001","significant":false,"signing_date":null,"start_page":88681,"subtype":null,"title":"Airworthiness Directives; CFM International, S.A. Engines","toc_doc":"CFM International, S.A. Engines","toc_subject":"Airworthiness Directives","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":89}