{"abstract":"This notice announces the availability of Technical Standard Order (TSO) C77b. This TSO prescribes the minimum performance standards that gas turbine auxiliary power units (APUs), commonly used in commercial aircraft, must meet in order to be identified with the TSO marking.","action":"Notice of availability of technical standard order.","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/2001/01/22/01-1858.html","cfr_references":[],"citation":"66 FR 6753","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"January 22, 2001.","disposition_notes":null,"docket_ids":[],"dockets":[],"document_number":"01-1858","effective_on":null,"end_page":6753,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2001/01/22/01-1858.xml","html_url":"https://www.federalregister.gov/documents/2001/01/22/01-1858/tso-c77b-gas-turbine-auxiliary-power-units","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/01-1858?publication_date=2001-01-22","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2001-01-22/01-1858/mods.xml","not_received_for_publication":null,"page_length":1,"page_views":{"count":3751,"last_updated":"2026-04-04 18:15:03 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2001-01-22/pdf/01-1858.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2001-01-22","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2001/01/22/01-1858.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2011-02-27T17:25:53Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":6753,"subtype":null,"title":"TSO-C77b, Gas Turbine Auxiliary Power Units","toc_doc":"Gas turbine auxiliary power units","toc_subject":"Technical standard orders:","topics":[],"type":"Notice","volume":66}