{"abstract":"We are adopting a new airworthiness directive (AD) for all Rolls-Royce plc (RR) model RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines. This AD was prompted by low-pressure (LP) compressor blade partial airfoil release events. This AD requires a one-time ultrasonic inspection of LP compressor blades that had accumulated more than 2,500 flight cycles (FC) since new. We are issuing this AD to prevent LP compressor blade airfoil separations, engine damage, 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/2013/06/24/2013-14922.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"78 FR 37703","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD becomes effective July 29, 2013. The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of July 29, 2013.","disposition_notes":null,"docket_ids":["Docket No. FAA-2012-1327","Directorate Identifier 2012-NE-47-AD","Amendment 39-17478","AD 2013-12-01"],"dockets":[],"document_number":"2013-14922","effective_on":"2013-07-29","end_page":37706,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2013/06/24/2013-14922.xml","html_url":"https://www.federalregister.gov/documents/2013/06/24/2013-14922/airworthiness-directives-rolls-royce-plc-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2013-14922?publication_date=2013-06-24","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2013-06-24/2013-14922/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":99,"last_updated":"2026-09-20 10:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2013-06-24/pdf/2013-14922.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2013-14922.pdf?1371819225","publication_date":"2013-06-24","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2013/06/24/2013-14922.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":"2013-08-04T05:01:06Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":37703,"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":78}