{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-400 series airplanes. This AD was prompted by a report of a certain modification that causes interference with inspections that are intended to detect fatigue cracks. This AD requires repetitive low frequency eddy current (LFEC) inspections of a certain fuselage upper skin lap splice for cracks, repetitive high frequency eddy current (HFEC) inspections of a certain fuselage upper skin lap splice for cracks, and applicable on-condition actions. 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/2020/03/09/2020-04728.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"39","title":14}],"citation":"85 FR 13477","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective April 13, 2020.","disposition_notes":null,"docket_ids":["Docket No. FAA-2019-0875","Product Identifier 2019-NM-143-AD","Amendment 39-19850","AD 2020-04-11"],"dockets":[{"supporting_documents":[{"title":"Supporting AD Documents","document_id":"FAA-2019-0875-0002"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2020-03-09","updated_at":"2023-03-01T14:05:25.211-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2019-0875-0004","allow_late_comments":null,"id":"FAA-2019-0875-0004","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2019-0875","title":"2019‑NM‑143‑AD\nThe Boeing Company Model 747‑400 series airplanes"}],"document_number":"2020-04728","effective_on":"2020-04-13","end_page":13479,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2020/03/09/2020-04728.xml","html_url":"https://www.federalregister.gov/documents/2020/03/09/2020-04728/airworthiness-directives-the-boeing-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2020-04728?publication_date=2020-03-09","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2020-03-09/2020-04728/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":172,"last_updated":"2026-10-23 04:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2020-03-09/pdf/2020-04728.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2020-04728.pdf?1583502328","publication_date":"2020-03-09","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2020/03/09/2020-04728.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":"Supporting AD Documents","document_id":"FAA-2019-0875-0002"}],"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-2019-0875","supporting_documents_count":1,"docket_id":"FAA-2019-0875","document_id":"FAA-2019-0875-0004","regulation_id_number":"2120-AA64","title":"2019‑NM‑143‑AD\nThe Boeing Company Model 747‑400 series airplanes","checked_regulationsdotgov_at":"2023-03-01T19:05:24Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":13477,"subtype":null,"title":"Airworthiness Directives; The Boeing Company Airplanes","toc_doc":null,"toc_subject":null,"topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":85}