{"abstract":"The FAA proposes to adopt a new airworthiness directive (AD) for certain Cessna Model 500, 501, 550, S550, 551, and 560 airplanes. This proposed AD would require revising the airplane flight manual (AFM) to prohibit use of the wing fuel boost pumps for defueling under certain conditions; installing a placard; doing other specified investigative and corrective actions as necessary; and modifying the boost pumps. This proposed AD also would require the subsequent removal of the AFM revision and placard. This proposed AD is prompted by a report of a chafed electrical wiring harness, which was arcing inside the fuel tank. We are proposing this AD to prevent potential fuel vapor ignition in a fuel tank, which could result in explosion and loss of the airplane.","action":"Notice of proposed rulemaking (NPRM).","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/2005/04/18/05-7674.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"70 FR 20083","comment_url":null,"comments_close_on":"2005-06-02","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by June 2, 2005.","disposition_notes":null,"docket_ids":["Docket No. FAA-2005-20970","Directorate Identifier 2004-NM-53-AD"],"dockets":[],"document_number":"05-7674","effective_on":null,"end_page":20085,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2005/04/18/05-7674.xml","html_url":"https://www.federalregister.gov/documents/2005/04/18/05-7674/airworthiness-directives-cessna-model-500-501-550-s550-551-and-560-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/05-7674?publication_date=2005-04-18","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2005-04-18/05-7674/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":146,"last_updated":"2026-08-24 02:15:07 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2005-04-18/pdf/05-7674.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2005-04-18","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2005/04/18/05-7674.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":{"checked_regulationsdotgov_at":"2011-11-12T15:53:18Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":20083,"subtype":null,"title":"Airworthiness Directives; Cessna Model 500, 501, 550, S550, 551, and 560 Airplanes","toc_doc":"Cessna","toc_subject":"Airworthiness directives:","topics":["Air transportation","Aircraft","Aviation safety","Safety"],"type":"Proposed Rule","volume":70}