{"abstract":"We are revising an earlier proposed airworthiness directive (AD) for certain Cessna Aircraft Company (Cessna) Model 525 airplanes equipped with certain part number (P/N) air conditioning (A/C) compressor motors. That NPRM proposed to require inspection of the number of hours on the A/C compressor hour meter, inspection of the logbook, and replacement of the brushes on certain P/N A/C compressor motors or deactivation of the A/C system until replacement of the brushes and also require reporting of aircraft information related to the replacement of the brushes. That NPRM was prompted by reports of smoke and/or fire in the tailcone caused by brushes wearing beyond their limits on the A/C motor. This action revises that NPRM by providing correct steps for deactivation of the A/C compressor motor. We are proposing this supplemental NPRM to correct the unsafe condition on these products. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.","action":"Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.","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/2012/12/06/2012-29398.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"77 FR 72778","comment_url":null,"comments_close_on":"2013-01-22","correction_of":null,"corrections":[],"dates":"We must receive comments on this supplemental NPRM by January 22, 2013.","disposition_notes":null,"docket_ids":["Docket No. FAA-2012-0880","Directorate Identifier 2012-CE-004-AD"],"dockets":[],"document_number":"2012-29398","effective_on":null,"end_page":72780,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2012/12/06/2012-29398.xml","html_url":"https://www.federalregister.gov/documents/2012/12/06/2012-29398/airworthiness-directives-cessna-aircraft-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2012-29398?publication_date=2012-12-06","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2012-12-06/2012-29398/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":128,"last_updated":"2026-08-24 18:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2012-12-06/pdf/2012-29398.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2012-29398.pdf?1354742591","publication_date":"2012-12-06","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2012/12/06/2012-29398.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 Attachments","document_id":"FAA-2012-0880-0009"},{"title":"U.S. DOT/FAA - See Attachment","document_id":"FAA-2012-0880-0005"},{"title":"U.S. DOT/FAA - See Attachments","document_id":"FAA-2012-0880-0002"}],"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2012-0880","supporting_documents_count":3,"docket_id":"FAA-2012-0880","regulation_id_number":null,"title":"2012-CE-004-AD","checked_regulationsdotgov_at":"2012-12-26T06:00:09Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":72778,"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":"Proposed Rule","volume":77}