{"abstract":"We are adopting a new airworthiness directive (AD) for certain Honeywell International Inc. models TFE731-4, -4R, -5, -5R, -5AR, and - 5BR series turbofan engines. This AD was prompted by a report of a rim/ web separation of a first stage low-pressure turbine (LPT1) rotor assembly. This AD requires replacing affected LPT1 rotor assemblies with assemblies eligible for installation. We are issuing this AD to prevent uncontained disk separation, engine failure, and damage to the airplane.","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/2012/08/28/2012-21010.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"77 FR 51892","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective October 2, 2012.","disposition_notes":null,"docket_ids":["Docket No. FAA-2011-1045","Directorate Identifier 2011-NE-32-AD","Amendment 39-17168","AD 2012-17-05"],"dockets":[],"document_number":"2012-21010","effective_on":"2012-10-02","end_page":51894,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2012/08/28/2012-21010.xml","html_url":"https://www.federalregister.gov/documents/2012/08/28/2012-21010/airworthiness-directives-honeywell-international-inc-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2012-21010?publication_date=2012-08-28","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2012-08-28/2012-21010/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":601,"last_updated":"2026-08-26 04:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2012-08-28/pdf/2012-21010.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2012-21010.pdf?1346071767","publication_date":"2012-08-28","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2012/08/28/2012-21010.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 - See Attachments","document_id":"FAA-2011-1045-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2011-1045","supporting_documents_count":1,"docket_id":"FAA-2011-1045","regulation_id_number":"2120-AA64","title":"Honeywell International Inc. Models TFE731-4, -4R, -5R, -5AR, and -5BR Turbofan Engines","checked_regulationsdotgov_at":"2012-11-18T05:00:56Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":51892,"subtype":null,"title":"Airworthiness Directives; Honeywell International Inc. Turbofan Engines","toc_doc":"Honeywell International Inc. Turbofan Engines","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":77}