{"abstract":"The FAA is superseding an existing airworthiness directive (AD) for certain GE CT7-8A turboshaft engines. That AD currently requires initial and repetitive inspections of the electrical chip detectors for the No. 3 bearing. This AD requires removing from service certain GE CT7-8A turboshaft engines within 6,200 cycles-since-new. This AD results from investigation for the root causes of two failures of the No. 3 bearing. We are issuing this AD to prevent failure of the No. 3 bearing due to contamination by aluminum oxide, which could result in a possible in-flight shutdown of the engines and loss of control or forced landing of the aircraft.","action":"Final rule.","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/2008/12/22/E8-29722.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"73 FR 78175","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD becomes effective January 26, 2009.","disposition_notes":null,"docket_ids":["Docket No. FAA-2006-24261","Directorate Identifier 2006-NE-12-AD","Amendment 39-15768","AD 2008-26-02"],"dockets":[],"document_number":"E8-29722","effective_on":"2009-01-26","end_page":78178,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2008/12/22/E8-29722.xml","html_url":"https://www.federalregister.gov/documents/2008/12/22/E8-29722/airworthiness-directives-general-electric-company-ge-ct7-8a-turboshaft-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/E8-29722?publication_date=2008-12-22","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2008-12-22/E8-29722/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":360,"last_updated":"2026-04-04 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2008-12-22/pdf/E8-29722.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2008-12-22","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2008/12/22/E8-29722.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":"2011-11-15T07:09:59Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":78175,"subtype":null,"title":"Airworthiness Directives; General Electric Company (GE) CT7-8A Turboshaft Engines","toc_doc":"General Electric Company (GE) CT7-8A Turboshaft Engines","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Safety"],"type":"Rule","volume":73}