{"abstract":"We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Canada Corp. (P&WC) PT6A-114 and PT6A-114A turboprop engines. This AD requires initial and repetitive borescope inspection (BSI) of compressor turbine (CT) blades, and the removal from service of blades that fail inspection. This AD was prompted by several incidents of CT blade failure, causing power loss, and engine failure. We are issuing this AD to prevent failure of CT blades, which could result in damage to the engine and damage to the airplane.","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/2014/09/03/2014-20453.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"79 FR 52172","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD becomes effective October 8, 2014.","disposition_notes":null,"docket_ids":["Docket No. FAA-2013-0766","Directorate Identifier 2013-NE-26-AD","Amendment 39-17961","AD 2014-17-08"],"dockets":[],"document_number":"2014-20453","effective_on":"2014-10-08","end_page":52174,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2014/09/03/2014-20453.xml","html_url":"https://www.federalregister.gov/documents/2014/09/03/2014-20453/airworthiness-directives-pratt-and-whitney-canada-corp-turboprop-engines","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2014-20453?publication_date=2014-09-03","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2014-09-03/2014-20453/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":2668,"last_updated":"2026-10-24 04:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2014-09-03/pdf/2014-20453.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2014-20453.pdf?1409662098","publication_date":"2014-09-03","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2014/09/03/2014-20453.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 - Federal Register Publication (Original)","document_id":"FAA-2013-0766-0023"},{"title":"U.S. DOT/FAA - Federal Register Notice of Proposed Rulemaking (Original)","document_id":"FAA-2013-0766-0018"},{"title":"U.S. DOT/FAA - Various Supplemental AD Documents","document_id":"FAA-2013-0766-0014"},{"title":"U.S. DOT/FAA - Public Comment Response","document_id":"FAA-2013-0766-0013"},{"title":"U.S. DOT/FAA - Various Supplemental AD Documents","document_id":"FAA-2013-0766-0008"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2013-0766-0002"}],"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-2013-0766","supporting_documents_count":6,"docket_id":"FAA-2013-0766","regulation_id_number":"2120-AA64","title":"Pratt & Whitney Canada Corp. Turboprop Engines","checked_regulationsdotgov_at":"2014-09-23T06:00:11Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":52172,"subtype":null,"title":"Airworthiness Directives; Pratt & Whitney Canada Corp. Turboprop Engines","toc_doc":"Pratt and Whitney Canada Corp. Turboprop Engines","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":79}