{"abstract":"The FAA is adopting a new airworthiness directive (AD) for all CFM International, S.A. (CFM) CFM56-5B and CFM56-7B model turbofan engines with a certain high-pressure turbine (HPT) inner stationary seal installed. This AD was prompted by cracks found in the rotating air HPT front seal. This AD requires removal, inspection, and replacement of the affected HPT inner stationary seal and, depending on the findings, replacement of the rotating air HPT front seal, HPT rotor blades, and No. 3 ball bearing. 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/2021/05/20/2021-10607.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"86 FR 27264","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective June 24, 2021.","disposition_notes":null,"docket_ids":["Docket No. FAA-2019-0568","Project Identifier 2019-NE-20-AD","Amendment 39-21542","AD 2021-10-09"],"dockets":[],"document_number":"2021-10607","effective_on":"2021-06-24","end_page":27268,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2021/05/20/2021-10607.xml","html_url":"https://www.federalregister.gov/documents/2021/05/20/2021-10607/airworthiness-directives-cfm-international-sa-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2021-10607?publication_date=2021-05-20","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2021-05-20/2021-10607/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":1908,"last_updated":"2026-04-04 04:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2021-05-20/pdf/2021-10607.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2021-10607.pdf?1621428327","publication_date":"2021-05-20","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2021/05/20/2021-10607.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":"Supporting AD Documents","document_id":"FAA-2019-0568-0015"},{"title":"Supporting AD Documents","document_id":"FAA-2019-0568-0014"},{"title":"Supporting AD Documents","document_id":"FAA-2019-0568-0002"}],"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-2019-0568","supporting_documents_count":3,"docket_id":"FAA-2019-0568","document_id":"FAA-2019-0568-0013","regulation_id_number":"2120-AA64","title":"CFM International S.A. Turbofan Engines\t2019-NE-20-AD\n\n","checked_regulationsdotgov_at":"2021-06-05T03:30:09Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":27264,"subtype":null,"title":"Airworthiness Directives; CFM International, S.A. Turbofan Engines","toc_doc":"CFM International, S.A. Turbofan Engines","toc_subject":"Airworthiness Directives:\n","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":86}