{"abstract":"We are superseding airworthiness directive (AD) 2014-16-10 for all Rolls-Royce plc (RR) RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines. AD 2014-16-10 required initial and repetitive ultrasonic inspections (UIs) of the affected low-pressure (LP) compressor blades. This AD requires the UIs in AD 2014-16-10 while reducing the inspection threshold. This AD was prompted by revised service information to reduce the inspection threshold for UI of the LP compressor blades. We are issuing this AD to correct the unsafe condition on these products.","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/2017/02/15/2017-02921.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"82 FR 10701","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective March 22, 2017.","disposition_notes":null,"docket_ids":["Docket No. FAA-2012-1327","Directorate Identifier 2012-NE-47-AD","Amendment 39-18793","AD 2017-03-02"],"dockets":[{"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"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2017-02-15","updated_at":"2023-03-01T13:27:22.513-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2012-1327-0013","allow_late_comments":null,"id":"FAA-2012-1327-0013","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":5,"id":"FAA-2012-1327","title":"Rolls-Royce plc Turbofan Engines"}],"document_number":"2017-02921","effective_on":"2017-03-22","end_page":10703,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2017/02/15/2017-02921.xml","html_url":"https://www.federalregister.gov/documents/2017/02/15/2017-02921/airworthiness-directives-rolls-royce-plc-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2017-02921?publication_date=2017-02-15","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2017-02-15/2017-02921/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":232,"last_updated":"2026-10-25 02:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2017-02-15/pdf/2017-02921.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2017-02921.pdf?1487079924","publication_date":"2017-02-15","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2017/02/15/2017-02921.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_count":0,"agency_id":"FAA","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","document_id":"FAA-2012-1327-0013","regulation_id_number":"2120-AA64","title":"Rolls-Royce plc Turbofan Engines","checked_regulationsdotgov_at":"2023-03-01T18:27:21Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":10701,"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":82}