{"abstract":"We propose to supersede airworthiness directive (AD) 2014-16- 10 that applies to all Rolls-Royce plc (RR) RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines. AD 2014-16-10 requires initial and repetitive ultrasonic inspections (UIs) of the affected low-pressure (LP) compressor blades. Since we issued AD 2014-16-10, RR issued revised service information to reduce the inspection threshold. This proposed AD would retain the UIs in AD 2014-16-10 while applying the revised inspection threshold. We are proposing this AD to prevent LP compressor blade airfoil separations, damage to the engine, 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/2016/11/01/2016-26334.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"81 FR 75762","comment_url":null,"comments_close_on":"2016-12-16","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by December 16, 2016.","disposition_notes":null,"docket_ids":["Docket No. FAA-2012-1327","Directorate Identifier 2012-NE-47-AD"],"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":1,"comment_start_date":"2016-11-01","updated_at":"2023-02-28T15:54:27.368-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2012-1327-0011","allow_late_comments":null,"id":"FAA-2012-1327-0011","comment_end_date":"2016-12-17","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":5,"id":"FAA-2012-1327","title":"Rolls-Royce plc Turbofan Engines"}],"document_number":"2016-26334","effective_on":null,"end_page":75764,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2016/11/01/2016-26334.xml","html_url":"https://www.federalregister.gov/documents/2016/11/01/2016-26334/airworthiness-directives-rolls-royce-plc-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2016-26334?publication_date=2016-11-01","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2016-11-01/2016-26334/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":124,"last_updated":"2026-10-23 18:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2016-11-01/pdf/2016-26334.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2016-26334.pdf?1477917971","publication_date":"2016-11-01","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2016/11/01/2016-26334.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":1,"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-2012-1327-0011","regulation_id_number":"2120-AA64","title":"Rolls-Royce plc Turbofan Engines","checked_regulationsdotgov_at":"2023-02-28T20:54:26Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":75762,"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":81}