{"abstract":"We are superseding airworthiness directive (AD) 2013-12-01 for all Rolls-Royce plc (RR) model RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines. AD 2013-12-01 required a one-time ultrasonic inspection (UI) of low-pressure (LP) compressor blades with more than 2,500 flight cycles since new or last inspection. This AD requires initial and repetitive UIs of the affected LP compressor blades. This AD was prompted by LP compressor blade partial airfoil release events. We are issuing this AD to prevent LP compressor blade airfoil separations, damage to the engine, 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/2014/08/19/2014-19017.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"79 FR 48961","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective September 23, 2014.","disposition_notes":null,"docket_ids":["Docket No. FAA-2012-1327","Directorate Identifier 2012-NE-47-AD","Amendment 39-17934","AD 2014-16-10"],"dockets":[],"document_number":"2014-19017","effective_on":"2014-09-23","end_page":48962,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2014/08/19/2014-19017.xml","html_url":"https://www.federalregister.gov/documents/2014/08/19/2014-19017/airworthiness-directives-rolls-royce-plc-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2014-19017?publication_date=2014-08-19","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2014-08-19/2014-19017/mods.xml","not_received_for_publication":null,"page_length":2,"page_views":{"count":91,"last_updated":"2026-10-22 14:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2014-08-19/pdf/2014-19017.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2014-19017.pdf?1408366123","publication_date":"2014-08-19","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2014/08/19/2014-19017.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 - Supporting AD Documents","document_id":"FAA-2012-1327-0014"},{"title":"U.S. DOT/FAA - Various Supporting AD Documents","document_id":"FAA-2012-1327-0008"},{"title":"U.S. DOT/FAA - Foreign Airworthiness Directive - Mandatory Continuing Airworthiness Information (MCAI)","document_id":"FAA-2012-1327-0007"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2012-1327-0005"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2012-1327-0003"}],"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-2012-1327","supporting_documents_count":5,"docket_id":"FAA-2012-1327","regulation_id_number":"2120-AA64","title":"Rolls-Royce plc Turbofan Engines","checked_regulationsdotgov_at":"2014-09-08T06:00:13Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":48961,"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":"Rule","volume":79}