{"abstract":"This rule amends the airworthiness standards for fatigue tolerance evaluation (FTE) of transport category rotorcraft metallic structures. This revises the FTE safety requirements to address advances in structural fatigue substantiation technology for metallic structures. This provides an increased level of safety by avoiding or reducing the likelihood of the catastrophic fatigue failure of a metallic structure. These increased safety requirements will help ensure that should serious accidental damage occur during manufacturing or within the operational life of the rotorcraft, the remaining structure could withstand, without failure, any fatigue loads that are likely to occur, until the damage is detected or the part is replaced. Besides improving the safety standards for FTE of all principal structural elements (PSEs), the amendment is harmonized with international standards.","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/2011/12/02/2011-30941.html","cfr_references":[{"chapter":null,"citation_url":null,"part":29,"title":14}],"citation":"76 FR 75435","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"Effective January 31, 2012.","disposition_notes":null,"docket_ids":["Docket No. FAA-2009-0413","Amdt. No. 29-55"],"dockets":[],"document_number":"2011-30941","effective_on":"2012-01-31","end_page":75442,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2011/12/02/2011-30941.xml","html_url":"https://www.federalregister.gov/documents/2011/12/02/2011-30941/fatigue-tolerance-evaluation-of-metallic-structures","images":{"ER02DE11.095":{"large":"https://img.federalregister.gov/ER02DE11.095/ER02DE11.095_large.png","medium":"https://img.federalregister.gov/ER02DE11.095/ER02DE11.095_medium.png","original_size":"https://img.federalregister.gov/ER02DE11.095/ER02DE11.095_original_size.png"}},"images_metadata":{"ER02DE11.095":{"large":{"identifier":"ER02DE11.095","content_type":"image/png","size":100168,"width":823,"sha":"c2050625985b8855ae97634f9c3b44a0","url":"https://img.federalregister.gov/ER02DE11.095/ER02DE11.095_large.png","height":663},"medium":{"identifier":"ER02DE11.095","content_type":"image/png","size":27709,"width":477,"sha":"11d4d667f982c934b2d3ca50d975e1af","url":"https://img.federalregister.gov/ER02DE11.095/ER02DE11.095_medium.png","height":384},"original_size":{"identifier":"ER02DE11.095","content_type":"image/png","size":75376,"width":1801,"sha":"96c66952e8254f69a042655510199965","url":"https://img.federalregister.gov/ER02DE11.095/ER02DE11.095_original_size.png","height":1450}}},"json_url":"https://www.federalregister.gov/api/v1/documents/2011-30941?publication_date=2011-12-02","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2011-12-02/2011-30941/mods.xml","not_received_for_publication":null,"page_length":8,"page_views":{"count":653,"last_updated":"2026-08-26 14:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2011-12-02/pdf/2011-30941.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2011-30941.pdf?1322747404","publication_date":"2011-12-02","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2011/12/02/2011-30941.txt","regulation_id_number_info":{"2120-AJ51":{"issue":"201104","html_url":"https://www.federalregister.gov/regulations/2120-AJ51/fatigue-tolerance-evaluation-of-metallic-structures","title":"Fatigue Tolerance Evaluation of Metallic Structures","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=201104&RIN=2120-AJ51&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["2120-AJ51"],"regulations_dot_gov_info":{"supporting_documents":[{"title":"U.S. DOT/FAA - See Attachment","document_id":"FAA-2009-0413-0008"},{"title":"U.S. DOT/FAA - Related Guidance Material to Advisory Circular","document_id":"FAA-2009-0413-0007"},{"title":"U.S. DOT/FAA - Regulatory Evaluation","document_id":"FAA-2009-0413-0003"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2009-0413-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AJ51/fatigue-tolerance-evaluation-of-metallic-structures","title":"Fatigue Tolerance Evaluation of Metallic Structures"},"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2009-0413","supporting_documents_count":4,"docket_id":"FAA-2009-0413","regulation_id_number":"2120-AJ51","title":"Fatigue Tolerance Evaluation of Metallic Structures ","checked_regulationsdotgov_at":"2011-12-22T09:03:35Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":75435,"subtype":null,"title":"Fatigue Tolerance Evaluation of Metallic Structures","toc_doc":"Fatigue Tolerance Evaluation of Metallic Structures","toc_subject":null,"topics":["Aircraft","Aviation safety"],"type":"Rule","volume":76}