{"abstract":"The FAA proposes to supersede Airworthiness Directive (AD) 2020-15-07, which applies to certain Rolls-Royce Deutschland Ltd & Co KG (RRD) (type certificate previously held by Rolls-Royce plc) Model RB211-524G2-19, RB211-524G2-T-19, RB211-524G3-19, RB211-524G3-T-19, RB211-524H2-19, RB211-524H2-T-19, RB211-524H-36, and RB211-524H-T-36 engines. AD 2020-15-07 requires replacement of the low-pressure turbine (LPT) stage 1 disk with part number (P/N) UL37606, UL37607, UL37608, UL37722 or UL37790, installed. Since the FAA issued AD 2020-15-07, RRD determined that additional LPT stage 1 disks are affected by the unsafe condition, and updated the Aircraft Maintenance Manual (AMM) to add new component life limits. This proposed AD would retain the requirement to replace the LPT stage 1 disk and would include additional LPT stage 1 disks, as specified in a European Union Aviation Safety Agency (EASA) AD, which is proposed for incorporation by reference (IBR). The FAA is 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/2023/07/12/2023-14468.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"88 FR 44235","comment_url":null,"comments_close_on":"2023-08-28","correction_of":null,"corrections":[],"dates":"The FAA must receive comments on this NPRM by August 28, 2023.","disposition_notes":null,"docket_ids":["Docket No. FAA-2023-1399","Project Identifier MCAI-2022-01533-E"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2023-1399-0007"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2023-1399-0002"}],"agency_name":"FAA","documents":[{"comment_count":3,"comment_start_date":"2023-07-12","updated_at":"2023-08-29T01:01:12.921-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2023-1399-0001","allow_late_comments":null,"id":"FAA-2023-1399-0001","comment_end_date":"2023-08-29","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":2,"id":"FAA-2023-1399","title":"MCAI-2022-01533-E; Rolls-Royce Deutschland Ltd & Co. KG Model RB211-524 engines; Low Pressure Turbine Stage 1 Discs – Life Reduction"}],"document_number":"2023-14468","effective_on":null,"end_page":44237,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2023/07/12/2023-14468.xml","html_url":"https://www.federalregister.gov/documents/2023/07/12/2023-14468/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-type-certificate-previously-held-by","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2023-14468?publication_date=2023-07-12","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2023-07-12/2023-14468/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":105,"last_updated":"2026-05-25 12:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2023-07-12/pdf/2023-14468.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2023-14468.pdf?1689079519","publication_date":"2023-07-12","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2023/07/12/2023-14468.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202504","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202504&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 - Supplemental AD Documents","document_id":"FAA-2023-1399-0007"},{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2023-1399-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":3,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2023-1399","supporting_documents_count":2,"docket_id":"FAA-2023-1399","document_id":"FAA-2023-1399-0001","regulation_id_number":"2120-AA64","title":"MCAI-2022-01533-E; Rolls-Royce Deutschland Ltd & Co. KG Model RB211-524 engines; Low Pressure Turbine Stage 1 Discs – Life Reduction","checked_regulationsdotgov_at":"2023-08-30T01:00:08Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":44235,"subtype":null,"title":"Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce plc) Engines","toc_doc":"Rolls-Royce Deutschland Ltd and Co KG (Type Certificate Previously Held by Rolls-Royce plc) Engines","toc_subject":"Airworthiness Directives:\n","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":88}