{"abstract":"We propose to supersede an existing airworthiness directive (AD) that applies to the products listed above. The existing AD currently requires replacing certain crankshafts. Since we issued that AD, Lycoming Engines discovered that the start date of affected engine models in Mandatory Service Bulletin (MSB) No. 569A, is incorrect. This proposed AD would correct that start date. We are proposing this AD to prevent failure of the crankshaft, which will result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.","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/2011/08/12/2011-20519.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"76 FR 50152","comment_url":null,"comments_close_on":"2011-09-26","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by September 26, 2011.","disposition_notes":null,"docket_ids":["Docket No. FAA-2006-24785","Directorate Identifier 2006-NE-20-AD"],"dockets":[],"document_number":"2011-20519","effective_on":null,"end_page":50156,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2011/08/12/2011-20519.xml","html_url":"https://www.federalregister.gov/documents/2011/08/12/2011-20519/airworthiness-directives-lycoming-engines-lo-360-lio-360-aeio-360-o-540-io-540-aeio-540-ltio-540","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2011-20519?publication_date=2011-08-12","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2011-08-12/2011-20519/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":5911,"last_updated":"2026-08-25 08:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2011-08-12/pdf/2011-20519.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2011-08-12","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2011/08/12/2011-20519.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 - See Attachments","document_id":"FAA-2006-24785-0026"},{"title":"U.S. DOT.FAA - See Attachments","document_id":"FAA-2006-24785-0023"},{"title":"U.S. DOT/FAA - Airworthiness Directive Grid","document_id":"FAA-2006-24785-0019"},{"title":"U.S. DOT/FAA - Economic & Regulatory Evaluation","document_id":"FAA-2006-24785-0009"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2006-24785","supporting_documents_count":4,"docket_id":"FAA-2006-24785","regulation_id_number":"2120-AA64","title":"2006-NE-20-AD","checked_regulationsdotgov_at":"2011-09-01T08:07:36Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":50152,"subtype":null,"title":"Airworthiness Directives; Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 Series Reciprocating Engines","toc_doc":"Lycoming Engines (L)O360, (L)IO360, AEIO360, O540, IO540, AEIO540, (L)TIO540, IO580, and IO720 Series Reciprocating Engines","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":76}