{"abstract":"This final rule amends the airworthiness standards for both normal and transport category rotorcraft. This amendment defines critical parts. This document also requires a critical parts list with procedures to control the design, substantiation, manufacture, maintenance, and modification of critical parts. The benefits of the rule will be the formalization of the current critical parts procedures and the harmonization of the Joint Aviation Authorities and the U.S. requirements.","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/1999/08/24/99-21647.html","cfr_references":[{"chapter":null,"citation_url":null,"part":"27","title":14},{"chapter":null,"citation_url":null,"part":"29","title":14}],"citation":"64 FR 46230","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"October 25, 1999.","disposition_notes":null,"docket_ids":["Docket No. 29311","Amdt. Nos. 27-38 and 29-45"],"dockets":[],"document_number":"99-21647","effective_on":"1999-10-25","end_page":46232,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":null,"html_url":"https://www.federalregister.gov/documents/1999/08/24/99-21647/harmonization-of-critical-parts-rotorcraft-regulations","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/99-21647?publication_date=1999-08-24","mods_url":"https://www.govinfo.gov/metadata/granule/FR-1999-08-24/99-21647/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":108,"last_updated":"2026-07-28 12:15:07 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-1999-08-24/pdf/99-21647.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"1999-08-24","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/1999/08/24/99-21647.txt","regulation_id_number_info":{"2120-AG60":{"issue":"199904","html_url":"https://www.federalregister.gov/regulations/2120-AG60/harmonization-of-critical-parts-rotorcraft-regulations","title":"Harmonization of Critical Parts Rotorcraft Regulations","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=199904&RIN=2120-AG60&operation=OPERATION_EXPORT_XML","priority_category":"Substantive, Nonsignificant"}},"regulation_id_numbers":["2120-AG60"],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2011-09-21T08:44:35Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":46230,"subtype":null,"title":"Harmonization of Critical Parts Rotorcraft Regulations","toc_doc":null,"toc_subject":null,"topics":[],"type":"Rule","volume":64}