{"abstract":"We are adopting a new airworthiness directive (AD) for all CFM International S.A. (CFM) LEAP-1B21, -1B23, -1B25, -1B27, -1B28, - 1B28B1, -1B28B2, -1B28B2C, -1B28B3, -1B28BBJ1, and -1B28BBJ2 turbofan engines. This AD requires removing certain electronic engine control (EEC) system operation (OPS) and engine health monitoring (EHM) software and installing versions eligible for installation. This AD was prompted by six aborted takeoffs on the similarly designed CFM LEAP-1A model turbofan engine after those engines did not advance to the desired takeoff fan speed due to icing in the pressure sensor line. We are 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/2018/12/11/2018-26611.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"83 FR 63559","comment_url":"https://www.regulations.gov/commenton/FAA-2018-1023-0001","comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective December 26, 2018.","disposition_notes":null,"docket_ids":["Docket No. FAA-2018-1023","Product Identifier 2018-NE-37-AD","Amendment 39-19520","AD 2018-25-09"],"dockets":[{"supporting_documents":[{"title":"FAA Response FRC comments to 2018-NE-37-AD","document_id":"FAA-2018-1023-0004"},{"title":"Supporting AD Documents","document_id":"FAA-2018-1023-0002"}],"agency_name":"FAA","documents":[{"comment_count":1,"comment_start_date":"2018-12-11","updated_at":"2024-11-13T13:12:49.870-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2018-1023-0001","allow_late_comments":true,"id":"FAA-2018-1023-0001","comment_end_date":"2019-01-26","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2018-1023","title":"CFM International Turbofan Engines\t2018-NE-37-AD\n\n"}],"document_number":"2018-26611","effective_on":"2018-12-26","end_page":63561,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2018/12/11/2018-26611.xml","html_url":"https://www.federalregister.gov/documents/2018/12/11/2018-26611/airworthiness-directives-cfm-international-sa-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2018-26611?publication_date=2018-12-11","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2018-12-11/2018-26611/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":371,"last_updated":"2026-04-04 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2018-12-11/pdf/2018-26611.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2018-26611.pdf?1544449517","publication_date":"2018-12-11","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2018/12/11/2018-26611.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":"FAA Response FRC comments to 2018-NE-37-AD","document_id":"FAA-2018-1023-0004"},{"title":"Supporting AD Documents","document_id":"FAA-2018-1023-0002"}],"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-2018-1023","supporting_documents_count":2,"docket_id":"FAA-2018-1023","document_id":"FAA-2018-1023-0001","regulation_id_number":"2120-AA64","title":"CFM International Turbofan Engines\t2018-NE-37-AD\n\n","checked_regulationsdotgov_at":"2024-11-13T22:00:10Z"},"regulations_dot_gov_url":"https://www.regulations.gov/commenton/FAA-2018-1023-0001","significant":false,"signing_date":null,"start_page":63559,"subtype":null,"title":"Airworthiness Directives; CFM International S.A. Turbofan Engines","toc_doc":"CFM International S.A. Turbofan Engines","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":83}