{"abstract":"We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737-100, -200, -200C, -300, -400, -500 series airplanes. This proposed AD was prompted by reports of cracking in certain flanges, and the adjacent web, of the wing outboard flap track at certain positions. This proposed AD would require an inspection to determine the part number of the wing outboard flap track assembly; repetitive inspections of each affected wing outboard flap track for discrepancies, and applicable on-condition actions; and repetitive overhaul of each wing outboard flap track. We are 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/2018/02/21/2018-03433.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"83 FR 7425","comment_url":null,"comments_close_on":"2018-04-09","correction_of":null,"corrections":[],"dates":"We must receive comments on this proposed AD by April 9, 2018.","disposition_notes":null,"docket_ids":["Docket No. FAA-2018-0112","Product Identifier 2017-NM-161-AD"],"dockets":[{"supporting_documents":[{"title":"Supporting AD Documents","document_id":"FAA-2018-0112-0002"}],"agency_name":"FAA","documents":[{"comment_count":4,"comment_start_date":"2018-02-21","updated_at":"2023-02-28T21:33:10.253-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2018-0112-0001","allow_late_comments":null,"id":"FAA-2018-0112-0001","comment_end_date":"2018-04-10","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2018-0112","title":"2017-NM-161-AD\nThe Boeing Company Model 737‑100, ‑200, ‑200C, ‑ 300, ‑400, ‑500 series airplanes"}],"document_number":"2018-03433","effective_on":null,"end_page":7428,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2018/02/21/2018-03433.xml","html_url":"https://www.federalregister.gov/documents/2018/02/21/2018-03433/airworthiness-directives-the-boeing-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2018-03433?publication_date=2018-02-21","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2018-02-21/2018-03433/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":1225,"last_updated":"2026-04-04 16:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2018-02-21/pdf/2018-03433.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2018-03433.pdf?1519134336","publication_date":"2018-02-21","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2018/02/21/2018-03433.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":"Supporting AD Documents","document_id":"FAA-2018-0112-0002"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":4,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2018-0112","supporting_documents_count":1,"docket_id":"FAA-2018-0112","document_id":"FAA-2018-0112-0001","regulation_id_number":"2120-AA64","title":"2017-NM-161-AD\nThe Boeing Company Model 737‑100, ‑200, ‑200C, ‑ 300, ‑400, ‑500 series airplanes","checked_regulationsdotgov_at":"2023-03-01T02:33:09Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":7425,"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":83}