{"abstract":"This notice announces the planned revocation of all Technical Standard Order authorizations (TSOA) issued for the production of Underwater Locating Devices (Acoustic) (Self-Powered) manufactured to the TSO-C121 and TSO-C121a specifications. These actions are necessary because the planned issuance of TSO-C121b, Underwater Locating Devices (Acoustic) (Self-Powered), with a minimum performance standard (MPS) that will increase the minimum operating life of Underwater Locating Devices from 30 days to 90 days.","action":"Notice of the planned revocation of the Technical Standard Order (TSO) authorizations (TSOA) for TSO-C121 and C121a, Underwater Locating Devices (ULD), and request for public comment.","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/2011/08/23/2011-21536.html","cfr_references":[],"citation":"76 FR 52734","comment_url":null,"comments_close_on":"2011-11-21","correction_of":null,"corrections":[],"dates":"Comments must be received on or before November 21, 2011.","disposition_notes":null,"docket_ids":[],"dockets":[],"document_number":"2011-21536","effective_on":null,"end_page":52734,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2011/08/23/2011-21536.xml","html_url":"https://www.federalregister.gov/documents/2011/08/23/2011-21536/underwater-locating-devices-acoustic-self-powered","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2011-21536?publication_date=2011-08-23","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2011-08-23/2011-21536/mods.xml","not_received_for_publication":null,"page_length":1,"page_views":{"count":1432,"last_updated":"2026-04-04 16:15:04 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2011-08-23/pdf/2011-21536.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":null,"publication_date":"2011-08-23","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2011/08/23/2011-21536.txt","regulation_id_number_info":{},"regulation_id_numbers":[],"regulations_dot_gov_info":{"checked_regulationsdotgov_at":"2011-09-10T08:07:10Z"},"regulations_dot_gov_url":null,"significant":null,"signing_date":null,"start_page":52734,"subtype":null,"title":"Underwater Locating Devices (Acoustic) (Self-Powered)","toc_doc":"Underwater Locating Devices (Acoustic) (SelfPowered)","toc_subject":null,"topics":[],"type":"Notice","volume":76}