{"abstract":"The FAA is superseding an existing airworthiness directive (AD) for Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines. That action requires replacing certain zinc-plated crankshaft gear retaining bolts. This action retains that requirement, but expands the population of affected engines. In addition, this AD adds five additional kits for replacing the crankshaft gear retaining bolts. This AD results from notification from the Manufacturer of 161 engines not identified in the previous AD. This AD also results from approval of the five additional kits as alternative methods of compliance with AD 2002-23-06. We are issuing this AD to prevent loss of all engine power and possible forced landing.","action":"Final rule; request for comments.","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/2004/03/15/04-5262.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"69 FR 12057","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"Effective March 30, 2004. The Director of the Federal Register approved the incorporation by reference of Lycoming Service Bulletin 554, dated September 30, 2002, on November 19, 2002 (67 FR 68932, November 14, 2002). The Director of the Federal Register approved the incorporation by reference of Lycoming Mandatory Service Bulletin No. 554, Supplement 5, dated August 15, 2003, as of March 30, 2004.","disposition_notes":null,"docket_ids":["Docket No. 2002-NE-31-AD","Amendment 39-13519","AD 2004-05-24"],"dockets":[],"document_number":"04-5262","effective_on":"2004-03-30","end_page":12060,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2004/03/15/04-5262.xml","html_url":"https://www.federalregister.gov/documents/2004/03/15/04-5262/airworthiness-directives-lycoming-engines-formerly-textron-lycoming-aeio-540-io-540-ltio-540-o-540","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/04-5262?publication_date=2004-03-15","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2004-03-15/04-5262/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":743,"last_updated":"2026-08-24 22:15:11 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2004-03-15/pdf/04-5262.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2004-03-15","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2004/03/15/04-5262.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":{"checked_regulationsdotgov_at":"2011-11-12T10:51:15Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":12057,"subtype":null,"title":"Airworthiness Directives; Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines","toc_doc":"Lycoming Engines","toc_subject":"Airworthiness directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":69}