{"abstract":"We propose to supersede airworthiness directive (AD) 2008-22- 24 which applies to certain Rolls-Royce plc (RR) RB211-535E4-37, RB211- 535E4-B-37, and RB211-535E4-B-75 model turbofan engines. AD 2008-22-24 requires initial and repetitive ultrasonic inspections of installed low-pressure compressor (LPC) fan blade roots on-wing and during overhaul, and relubrication according to accumulated life cycles. Since we issued AD 2008-22-24, RR determined the need to expand the inspections to engines operating under additional flight profiles and to extend the inspection intervals for certain affected engines. This proposed AD would require initial and repetitive inspections to detect cracks on the installed LPC fan blade roots on-wing or at engine overhaul. We are proposing this AD to address the unsafe condition on these products.","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/2019/05/20/2019-10233.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"84 FR 22738","comment_url":null,"comments_close_on":"2019-07-01","correction_of":null,"corrections":["https://www.federalregister.gov/api/v1/documents/C1-2019-10233"],"dates":"We must receive comments on this proposed AD by July 1, 2019.","disposition_notes":null,"docket_ids":["Docket No. FAA-2018-1034","Product Identifier 2018-NE-38-AD"],"dockets":[{"supporting_documents":[{"title":"Supporting AD Documents","document_id":"FAA-2018-1034-0004"}],"agency_name":"FAA","documents":[{"comment_count":2,"comment_start_date":"2019-05-20","updated_at":"2023-02-28T14:17:42.394-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2018-1034-0001","allow_late_comments":null,"id":"FAA-2018-1034-0001","comment_end_date":"2019-07-02","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2018-1034","title":"Rolls-Royce PLC RB211-535E4 Series Turbofan Engines\t2018-NE-38-AD\n\n"}],"document_number":"2019-10233","effective_on":null,"end_page":22740,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2019/05/20/2019-10233.xml","html_url":"https://www.federalregister.gov/documents/2019/05/20/2019-10233/airworthiness-directives-rolls-royce-plc-turbofan-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2019-10233?publication_date=2019-05-20","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2019-05-20/2019-10233/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":210,"last_updated":"2026-04-03 20:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2019-05-20/pdf/2019-10233.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2019-10233.pdf?1558097118","publication_date":"2019-05-20","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2019/05/20/2019-10233.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":"Supporting AD Documents","document_id":"FAA-2018-1034-0004"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":2,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2018-1034","supporting_documents_count":1,"docket_id":"FAA-2018-1034","document_id":"FAA-2018-1034-0001","regulation_id_number":"2120-AA64","title":"Rolls-Royce PLC RB211-535E4 Series Turbofan Engines\t2018-NE-38-AD\n\n","checked_regulationsdotgov_at":"2023-02-28T19:17:41Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":22738,"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":84}