{"abstract":"The FAA is supplementing the Notice of Proposed Rulemaking (NPRM) on Reduced Vertical Separation Minimum in Domestic United States Airspace (DRVSM) that was published in the Federal Register on May 10, 2002 (67 FR 31920). The FAA is adding a proposal to implement Reduced Vertical Separation Minimum (RVSM) between flight levels (FL) 290-410 in Atlantic High and Gulf of Mexico High Offshore airspace and in the San Juan Flight Information Region (FIR). This addition to the proposal better defines RVSM airspace off the eastern and southern coasts of the United States (U.S.) and harmonizes RVSM operations off the east coast of the U.S. between adjoining airspaces in the domestic U.S., Atlantic High Offshore, and the New York Oceanic FIR. The FAA also proposes to remove the proposed option that would have permitted part 91 turbo- propeller aircraft to operate in DRVSM airspace with a single RVSM compliant altimeter.","action":"Supplemental notice of proposed rulemaking (SNPRM).","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/2003/02/28/03-4765.html","cfr_references":[{"chapter":null,"citation_url":null,"part":91,"title":14}],"citation":"68 FR 9818","comment_url":null,"comments_close_on":"2003-04-14","correction_of":null,"corrections":[],"dates":"Comments must be submitted on or before April 14, 2003.","disposition_notes":null,"docket_ids":["Docket No. FAA-2002-12261","Notice No. 03-04"],"dockets":[],"document_number":"03-4765","effective_on":null,"end_page":9822,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2003/02/28/03-4765.xml","html_url":"https://www.federalregister.gov/documents/2003/02/28/03-4765/reduced-vertical-separation-minimum-in-domestic-united-states-airspace","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/03-4765?publication_date=2003-02-28","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2003-02-28/03-4765/mods.xml","not_received_for_publication":null,"page_length":5,"page_views":{"count":124,"last_updated":"2026-09-21 10:15:07 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2003-02-28/pdf/03-4765.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2003-02-28","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2003/02/28/03-4765.txt","regulation_id_number_info":{"2120-AH68":{"issue":"200304","html_url":"https://www.federalregister.gov/regulations/2120-AH68/reduced-vertical-separation-minimum-in-domestic-united-states-airspace","title":"Reduced Vertical Separation Minimum in Domestic United States Airspace","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=200304&RIN=2120-AH68&operation=OPERATION_EXPORT_XML","priority_category":"Other Significant"}},"regulation_id_numbers":["2120-AH68"],"regulations_dot_gov_info":{},"regulations_dot_gov_url":null,"significant":true,"signing_date":null,"start_page":9818,"subtype":null,"title":"Reduced Vertical Separation Minimum in Domestic United States Airspace","toc_doc":"Reduced vertical separation minimum in domestic U.S. airspace","toc_subject":"Air traffic operating and flight rules, etc.:","topics":["Air traffic control","Aircraft","Airmen","Airports","Aviation safety","Reporting and recordkeeping requirements"],"type":"Proposed Rule","volume":68}