{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC- 9-83 (MD-83), and DC-9-87 (MD-87) airplanes; and Model MD-88 airplanes. This AD was prompted by an evaluation by the design approval holder (DAH) indicating that certain center wing lower stringers are subject to widespread fatigue damage (WFD). WFD analysis found that fatigue cracks could grow to a critical length after the structural modification point (SMP) for these center wing lower stringers. This AD requires replacing certain left and right side center wing lower stringers. The FAA is issuing this AD to address the unsafe condition on these products.","action":"Final rule.","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/2023/02/06/2023-02371.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"88 FR 7575","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective March 13, 2023.","disposition_notes":null,"docket_ids":["Docket No. FAA-2022-0874","Project Identifier AD-2022-00337-T","Amendment 39-22307","AD 2023-01-13"],"dockets":[{"supporting_documents":[{"title":"U.S. DOT/FAA - Supplemental AD Document (MD80-57A246 RB)","document_id":"FAA-2022-0874-0004"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2023-02-06","updated_at":"2023-02-25T00:13:28.047-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2022-0874-0007","allow_late_comments":null,"id":"FAA-2022-0874-0007","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2022-0874","title":"AD-2022-00337-T The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 airplanes; center wing lower stringers"}],"document_number":"2023-02371","effective_on":"2023-03-13","end_page":7578,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2023/02/06/2023-02371.xml","html_url":"https://www.federalregister.gov/documents/2023/02/06/2023-02371/airworthiness-directives-the-boeing-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2023-02371?publication_date=2023-02-06","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2023-02-06/2023-02371/mods.xml","not_received_for_publication":null,"page_length":4,"page_views":{"count":292,"last_updated":"2026-04-04 08:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2023-02-06/pdf/2023-02371.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2023-02371.pdf?1675431922","publication_date":"2023-02-06","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2023/02/06/2023-02371.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 - Supplemental AD Document (MD80-57A246 RB)","document_id":"FAA-2022-0874-0004"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2120-AA64/airworthiness-directives","title":"Airworthiness Directives"},"comments_count":0,"agency_id":"FAA","comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=FAA-2022-0874","supporting_documents_count":1,"docket_id":"FAA-2022-0874","document_id":"FAA-2022-0874-0007","regulation_id_number":"2120-AA64","title":"AD-2022-00337-T The Boeing Company Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 airplanes; center wing lower stringers","checked_regulationsdotgov_at":"2023-02-25T05:13:27Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":7575,"subtype":null,"title":"Airworthiness Directives; The Boeing Company Airplanes","toc_doc":"The Boeing Company Airplanes","toc_subject":"Airworthiness Directives:\n","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":88}