{"abstract":"We are adopting a new airworthiness directive (AD) for certain Twin Commander Aircraft LLC Models 690, 690A, and 690B airplanes. This AD requires inspection for cracking of the outer fuselage attachments, the lower wing main spar, the vertical channels, the upper picture window channels, aft cabin pressure web, external wing to fuselage fillets, and fasteners; repair or replacement of damaged parts as necessary; and modification of the structure with reinforced parts. This AD was prompted by cracks found in the upper picture window frame channels, left- and right-hand wing main spar frame support channels, and aft pressure bulkhead web. This condition, if not corrected, could result in structural failure of the airplane. We are issuing this AD to correct the unsafe condition on these products.","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/2013/05/14/2013-10498.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"78 FR 28125","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective May 29, 2013.","disposition_notes":null,"docket_ids":["Docket No. FAA-2013-0393","Directorate Identifier 2012-CE-025-AD","Amendment 39-17446","AD 2013-09-05"],"dockets":[],"document_number":"2013-10498","effective_on":"2013-05-29","end_page":28128,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2013/05/14/2013-10498.xml","html_url":"https://www.federalregister.gov/documents/2013/05/14/2013-10498/airworthiness-directives-twin-commander-aircraft-llc-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2013-10498?publication_date=2013-05-14","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2013-05-14/2013-10498/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":2132,"last_updated":"2026-06-27 02:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2013-05-14/pdf/2013-10498.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2013-10498.pdf?1368449312","publication_date":"2013-05-14","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2013/05/14/2013-10498.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":{"supporting_documents":[{"title":"U.S. DOT/FAA - AD Docket Supporting Information; Comment Disposition","document_id":"FAA-2013-0393-0011"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2013-0393-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2013-0393","supporting_documents_count":2,"docket_id":"FAA-2013-0393","regulation_id_number":"2120-AA64","title":"2012-CE-025-AD Twin Commander 685/690 main wing spar","checked_regulationsdotgov_at":"2013-06-19T05:00:10Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":28125,"subtype":null,"title":"Airworthiness Directives; Twin Commander Aircraft LLC Airplanes","toc_doc":"Twin Commander Aircraft LLC Airplanes","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":78}