{"abstract":"We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-400 series airplanes, as modified by a certain supplemental type certificate. This proposed AD was prompted by the discovery of a design drawing error regarding placards that identified incorrect squibs and pressure switches for certain fire extinguisher bottles. This proposed AD would require a detailed inspection of certain cargo placards to determine if they are the correct placards and in the correct location, a detailed inspection of the harnesses to verify that they are marked and installed correctly, and corrective action if necessary. We are proposing this AD to detect and correct incorrectly installed harnesses for the cargo fire suppression system bottles, which could result in an incorrect activation sequence of the bottles, the inability to suppress a cargo fire quickly, and a possible uncontrollable fire.","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/2015/07/02/2015-16155.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"80 FR 38033","comment_url":null,"comments_close_on":"2015-08-17","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by August 17, 2015.","disposition_notes":null,"docket_ids":["Docket No. FAA-2015-1990","Directorate Identifier 2015-NM-027-AD"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Various Supplemental AD Documents","document_id":"FAA-2015-1990-0003"}],"agency_name":null,"documents":[{"comment_count":2,"comment_start_date":"2015-07-02","updated_at":"2023-03-01T00:06:56.917-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2015-1990-0001","allow_late_comments":null,"id":"FAA-2015-1990-0001","comment_end_date":"2015-08-18","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2015-1990","title":"2015-NM-027-AD The Boeing Company Model 737?400 series airplanes"}],"document_number":"2015-16155","effective_on":null,"end_page":38036,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2015/07/02/2015-16155.xml","html_url":"https://www.federalregister.gov/documents/2015/07/02/2015-16155/airworthiness-directives-the-boeing-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2015-16155?publication_date=2015-07-02","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2015-07-02/2015-16155/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":144,"last_updated":"2026-04-04 12:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2015-07-02/pdf/2015-16155.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2015-16155.pdf?1435754732","publication_date":"2015-07-02","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2015/07/02/2015-16155.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 - Various Supplemental AD Documents","document_id":"FAA-2015-1990-0003"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":2,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2015-1990","supporting_documents_count":1,"docket_id":"FAA-2015-1990","document_id":"FAA-2015-1990-0001","regulation_id_number":"2120-AA64","title":"2015-NM-027-AD The Boeing Company Model 737?400 series airplanes","checked_regulationsdotgov_at":"2023-03-01T05:06:56Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":38033,"subtype":null,"title":"Airworthiness Directives; The Boeing Company Airplanes","toc_doc":"The Boeing Company Airplanes","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Proposed Rule","volume":80}