{"abstract":"We propose to supersede airworthiness directive (AD) 2001-13- 51 for Bell Model 206L-4, 407, and 427 helicopters. AD 2001-13-51 currently requires inspecting certain driveshafts for a crack, a loose bolt or nut, or red powder residue and replacing a driveshaft if there is a crack, a loose bolt or nut, or red powder residue. AD 2001-13-51 also requires notifying the FAA within 10 days if a crack is found in the driveshaft. Since we issued AD 2001-13-51, the Model 429 helicopter has been certificated, and the reporting requirement is no longer necessary. This proposed AD would retain the inspection requirement of AD 2001-13-51, expand the applicability to include the Model 429 helicopter, and remove the reporting requirement. These proposed actions are intended to prevent failure of a driveshaft, loss of drive to the main rotor system, and a subsequent emergency landing.","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/2014/09/15/2014-21919.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"79 FR 54922","comment_url":null,"comments_close_on":"2014-11-14","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by November 14, 2014.","disposition_notes":null,"docket_ids":["Docket No. FAA-2014-0643","Directorate Identifier 2013-SW-059-AD"],"dockets":[],"document_number":"2014-21919","effective_on":null,"end_page":54925,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2014/09/15/2014-21919.xml","html_url":"https://www.federalregister.gov/documents/2014/09/15/2014-21919/airworthiness-directives-bell-helicopter-textron-canada-bell-helicopters","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2014-21919?publication_date=2014-09-15","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2014-09-15/2014-21919/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":99,"last_updated":"2026-08-27 00:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2014-09-15/pdf/2014-21919.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2014-21919.pdf?1410525815","publication_date":"2014-09-15","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2014/09/15/2014-21919.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":{"checked_regulationsdotgov_at":"2015-01-10T12:05:31Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":54922,"subtype":null,"title":"Airworthiness Directives; Bell Helicopter Textron Canada (Bell) Helicopters","toc_doc":"Bell Helicopter Textron Canada (Bell) Helicopters","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":79}