{"abstract":"We are adopting a new airworthiness directive (AD) for certain Airbus Helicopters Model EC225LP helicopters. This AD adds a new operating limitation that requires increasing the minimum density altitude flight limitation for helicopters without certain Eurocopter modifications installed. This AD is prompted by a report that flights below a certain density altitude create oscillations in the main rotor which can transfer dynamic loads to the structure, the main gearbox (MGB), and the main servo-control inputs, which could result in subsequent loss of control of the helicopter.","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/2014/03/03/2014-04314.html","cfr_references":[{"chapter":null,"citation_url":null,"part":39,"title":14}],"citation":"79 FR 11701","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This AD is effective April 7, 2014.","disposition_notes":null,"docket_ids":["Docket No. FAA-2013-0770","Directorate Identifier 2011-SW-057-AD","Amendment 39-17771","AD 2014-04-12"],"dockets":[],"document_number":"2014-04314","effective_on":"2014-04-07","end_page":11703,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2014/03/03/2014-04314.xml","html_url":"https://www.federalregister.gov/documents/2014/03/03/2014-04314/airworthiness-directives-airbus-helicopters-type-certificate-previously-held-by-eurocopter-france","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2014-04314?publication_date=2014-03-03","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2014-03-03/2014-04314/mods.xml","not_received_for_publication":null,"page_length":3,"page_views":{"count":72,"last_updated":"2026-04-24 06:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2014-03-03/pdf/2014-04314.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2014-04314.pdf?1393595298","publication_date":"2014-03-03","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2014/03/03/2014-04314.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":{"checked_regulationsdotgov_at":"2014-03-23T06:00:10Z"},"regulations_dot_gov_url":null,"significant":false,"signing_date":null,"start_page":11701,"subtype":null,"title":"Airworthiness Directives; Airbus Helicopters (Type Certificate Previously Held by Eurocopter France) (Airbus Helicopters)","toc_doc":"Airbus Helicopters (Type Certificate Previously Held by Eurocopter France) (Airbus Helicopters)","toc_subject":"Airworthiness Directives:","topics":["Air transportation","Aircraft","Aviation safety","Incorporation by reference","Safety"],"type":"Rule","volume":79}