{"abstract":"The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by significant changes, including new or more restrictive requirements, made to the airworthiness limitations (AWLs) and Critical Design Configuration Control Limitations (CDCCLs) related to fuel tank ignition prevention, the engine fuel suction feed system, and the nitrogen generation system. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. 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/2021/12/28/2021-28133.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"86 FR 73660","comment_url":"https://www.regulations.gov/commenton/FAA-2021-0134-0007","comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective February 1, 2022.","disposition_notes":null,"docket_ids":["Docket No. FAA-2021-0134","Project Identifier AD-2020-01254-T","Amendment 39-21833","AD 2021-24-12"],"dockets":[{"supporting_documents":[{"title":"Supporting AD Documents","document_id":"FAA-2021-0134-0008"}],"agency_name":"FAA","documents":[{"comment_count":0,"comment_start_date":"2021-12-28","updated_at":"2024-11-06T20:42:41.942-05:00","comment_url":"https://www.regulations.gov/commenton/FAA-2021-0134-0007","allow_late_comments":true,"id":"FAA-2021-0134-0007","comment_end_date":null,"regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":1,"id":"FAA-2021-0134","title":"2020-NM-XXX-AD"}],"document_number":"2021-28133","effective_on":"2022-02-01","end_page":73664,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2021/12/28/2021-28133.xml","html_url":"https://www.federalregister.gov/documents/2021/12/28/2021-28133/airworthiness-directives-the-boeing-company-airplanes","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2021-28133?publication_date=2021-12-28","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2021-12-28/2021-28133/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":669,"last_updated":"2026-04-04 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2021-12-28/pdf/2021-28133.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2021-28133.pdf?1640612735","publication_date":"2021-12-28","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2021/12/28/2021-28133.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-2021-0134-0008"}],"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-2021-0134","supporting_documents_count":1,"docket_id":"FAA-2021-0134","document_id":"FAA-2021-0134-0007","regulation_id_number":"2120-AA64","title":"2020-NM-XXX-AD","checked_regulationsdotgov_at":"2024-11-08T00:00:12Z"},"regulations_dot_gov_url":"https://www.regulations.gov/commenton/FAA-2021-0134-0007","significant":false,"signing_date":null,"start_page":73660,"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":86}