{"abstract":"This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Company (GE) CJ610 series turbojet and CF700 series turbofan engines. This action requires removal from service of possibly defective turbine torque rings and compressor drive shafts which may have been manufactured from contaminated material; and replacement with serviceable parts. This amendment is prompted by a report of a cooling plate removed from a GE CT58 series engine that was found to have an iron-rich inclusion that came from a contaminated heat lot. Parts on GE CJ610 series and CF700 series engines which were manufactured from the same and similar heat lots may also be contaminated. The actions specified in this AD are intended to prevent turbine torque ring or compressor drive shaft failure due to a manufacturing defect, which could result in an uncontained engine failure.","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/1997/12/08/97-31862.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"62 FR 64513","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"Effective January 2, 1998. The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of January 2, 1998.","disposition_notes":null,"docket_ids":["Docket No. 97-ANE-21-AD","Amendment 39-10232","AD 97-25-08"],"dockets":[],"document_number":"97-31862","effective_on":"1998-01-02","end_page":64514,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":null,"html_url":"https://www.federalregister.gov/documents/1997/12/08/97-31862/airworthiness-directives-general-electric-company-cj610-series-turbojet-and-cf700-series-turbofan","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/97-31862?publication_date=1997-12-08","mods_url":"https://www.govinfo.gov/metadata/granule/FR-1997-12-08/97-31862/mods.xml","not_received_for_publication":null,"page_length":2,"page_views":{"count":52,"last_updated":"2026-04-04 12:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-1997-12-08/pdf/97-31862.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"1997-12-08","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/1997/12/08/97-31862.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":{},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":64513,"subtype":null,"title":"Airworthiness Directives; General Electric Company CJ610 Series Turbojet and CF700 Series Turbofan Engines","toc_doc":null,"toc_subject":null,"topics":[],"type":"Rule","volume":62}