{"abstract":"We propose to adopt a new airworthiness directive (AD) for certain Rolls-Royce plc (RR) RB211 Trent 875-17, 877-17, 884-17, 884B- 17, 892-17, 892B-17, and 895-17 turbofan engines. The proposed AD was prompted by thin-walled low pressure (LP) turbine bearing support and exhaust case assemblies having been delivered into service. This proposed AD would require inspection of the affected LP turbine bearing support and exhaust case assembly and, if necessary, its replacement with a part eligible for installation. We are proposing this AD to prevent failure of the LP turbine bearing support and exhaust case assembly, which could lead to engine separation and damage to the airplane.","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/2014/03/03/2014-04350.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"79 FR 11719","comment_url":null,"comments_close_on":"2014-05-02","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by May 2, 2014.","disposition_notes":null,"docket_ids":["Docket No. FAA-2013-0953","Directorate Identifier 2013-NE-32-AD"],"dockets":[],"document_number":"2014-04350","effective_on":null,"end_page":11721,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2014/03/03/2014-04350.xml","html_url":"https://www.federalregister.gov/documents/2014/03/03/2014-04350/airworthiness-directives-rolls-royce-plc-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2014-04350?publication_date=2014-03-03","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2014-03-03/2014-04350/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":179,"last_updated":"2026-04-24 06:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2014-03-03/pdf/2014-04350.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2014-04350.pdf?1393595327","publication_date":"2014-03-03","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2014/03/03/2014-04350.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":{"checked_regulationsdotgov_at":"2014-03-23T06:00:11Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":11719,"subtype":null,"title":"Airworthiness Directives; Rolls-Royce plc Turbofan Engines","toc_doc":"Rolls-Royce plc Turbofan Engines","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":79}