{"abstract":"We are superseding an existing airworthiness directive (AD) for all Piper Aircraft, Inc. Models PA-31, PA-31-325, and PA-31-350 airplanes. That AD currently requires a detailed repetitive inspection of the exhaust system downstream of the turbochargers and repair or replacement of parts as necessary. This new AD requires visual repetitive inspections, expanding the inspection scope to include the entirety of each airplane exhaust system. This AD was prompted by reports of exhaust system failures upstream of aircraft turbochargers and between recurring detailed inspections. We are issuing this AD to correct the unsafe condition on these products.","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/2013/06/12/2013-13666.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"78 FR 35110","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective July 17, 2013.","disposition_notes":null,"docket_ids":["Docket No. FAA-2012-0983","Directorate Identifier 2012-CE-001-AD","Amendment 39-17457","AD 2013-10-04"],"dockets":[],"document_number":"2013-13666","effective_on":"2013-07-17","end_page":35114,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2013/06/12/2013-13666.xml","html_url":"https://www.federalregister.gov/documents/2013/06/12/2013-13666/airworthiness-directives-piper-aircraft-inc-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2013-13666?publication_date=2013-06-12","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2013-06-12/2013-13666/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":2183,"last_updated":"2026-09-21 00:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2013-06-12/pdf/2013-13666.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2013-13666.pdf?1370955474","publication_date":"2013-06-12","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2013/06/12/2013-13666.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 - See Attachment","document_id":"FAA-2012-0983-0013"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2012-0983-0011"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2012-0983-0002"}],"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2012-0983","supporting_documents_count":3,"docket_id":"FAA-2012-0983","regulation_id_number":null,"title":"2012-CE-001-AD","checked_regulationsdotgov_at":"2013-07-02T08:23:42Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":35110,"subtype":null,"title":"Airworthiness Directives; Piper Aircraft, Inc. Airplanes","toc_doc":"Piper Aircraft, Inc. Airplanes","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":78}