{"abstract":"The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737 -300, -400, and -500 series airplanes. This proposed AD was prompted by reports of nuisance stick shaker activation while accelerating to cruise speed at the top of a climb due to frozen angle of airflow (AOA) sensor vanes. This proposed AD would require installing new external case heaters (ECHs) on the left and right AOA sensors, performing repetitive functional tests and applicable corrective actions, and accomplishing applicable concurrent actions. The FAA is proposing this AD to address the unsafe condition on these products.","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/2026/08/18/2026-16795.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"91 FR 53391","comment_url":null,"comments_close_on":"2026-10-02","correction_of":null,"corrections":[],"dates":"The FAA must receive comments on this proposed AD by October 2, 2026.","disposition_notes":null,"docket_ids":["Docket No. FAA-2026-7237","Project Identifier AD-2025-01425-T"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Documents","document_id":"FAA-2026-7237-0002"}],"agency_name":"FAA","documents":[{"comment_count":6,"comment_start_date":"2026-08-18","updated_at":"2026-10-03T01:56:39.461-04:00","comment_url":"https://www.regulations.gov/commenton/FAA-2026-7237-0001","allow_late_comments":false,"id":"FAA-2026-7237-0001","comment_end_date":"2026-10-03","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2026-7237","title":"AD-2025-01425-T; The Boeing Company Model 737-300, -400, and -500 series airplanes; angle of airflow sensors"}],"document_number":"2026-16795","effective_on":null,"end_page":53393,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2026/08/18/2026-16795.xml","html_url":"https://www.federalregister.gov/documents/2026/08/18/2026-16795/airworthiness-directives-the-boeing-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2026-16795?publication_date=2026-08-18","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2026-08-18/2026-16795/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":390,"last_updated":"2026-10-23 20:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2026-08-18/pdf/2026-16795.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2026-16795.pdf?1786970721","publication_date":"2026-08-18","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2026/08/18/2026-16795.txt","regulation_id_number_info":{"2120-AA64":{"issue":"202504","html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=202504&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 - Supplemental AD Documents","document_id":"FAA-2026-7237-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":6,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2026-7237","supporting_documents_count":1,"docket_id":"FAA-2026-7237","document_id":"FAA-2026-7237-0001","regulation_id_number":"2120-AA64","title":"AD-2025-01425-T; The Boeing Company Model 737-300, -400, and -500 series airplanes; angle of airflow sensors","checked_regulationsdotgov_at":"2026-10-04T08:55:03Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":53391,"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":91}