{"abstract":"We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft Company Model 500, 501, 550, 551, S550, 560, and 650 airplanes. This AD was prompted by reports of smoke and/or fire in the tailcone caused by sparking due to excessive wear of the brushes in the air conditioning (A/C) motor. This AD requires inspections to determine if certain A/C compressor motors are installed and to determine the accumulated hours on certain A/C compressor motor assemblies; and repetitive replacement of the brushes in the A/C compressor motor assembly, or, as an option to the brush replacement, deactivation of the A/C system and placard installation; and return of replaced brushes to Cessna. We are issuing this AD to prevent the brushes in the A/C motor from wearing down beyond their limits, which could result in the rivet in the brush contacting the commutator, causing sparks and consequent fire and/or smoke in the tailcone with no means to detect or extinguish the fire and/or smoke.","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/2015/08/25/2015-20692.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"80 FR 51443","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective September 29, 2015.","disposition_notes":null,"docket_ids":["Docket No. FAA-2014-1044","Directorate Identifier 2014-NM-148-AD","Amendment 39-18245","AD 2015-17-12"],"dockets":[],"document_number":"2015-20692","effective_on":"2015-09-29","end_page":51447,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2015/08/25/2015-20692.xml","html_url":"https://www.federalregister.gov/documents/2015/08/25/2015-20692/airworthiness-directives-cessna-aircraft-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2015-20692?publication_date=2015-08-25","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2015-08-25/2015-20692/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":670,"last_updated":"2026-08-24 18:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2015-08-25/pdf/2015-20692.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2015-20692.pdf?1440420325","publication_date":"2015-08-25","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2015/08/25/2015-20692.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 - AMM 550-551,550 Bravo,560 Ch 4","document_id":"FAA-2014-1044-0005"},{"title":"U.S. DOT/FAA - AMM 500-501,S550,650 Ch 4","document_id":"FAA-2014-1044-0004"},{"title":"U.S. DOT/FAA - Various Supplemental AD Documents","document_id":"FAA-2014-1044-0002"}],"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-2014-1044","supporting_documents_count":3,"docket_id":"FAA-2014-1044","regulation_id_number":"2120-AA64","title":"2014-NM-148-AD Airworthiness Directives; Cessna Aircraft Company Airplanes","checked_regulationsdotgov_at":"2015-09-14T06:00:12Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":51443,"subtype":null,"title":"Airworthiness Directives; Cessna Aircraft Company Airplanes","toc_doc":"Cessna Aircraft Company Airplanes","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":80}