{"airworthiness_class":"","airworthiness_date":"","airworthiness_ops":"","category":"conventional","cert_issue_date":"2025-08-26","city":"BOULDER","country_code":"US","county_code":"013","cruise_speed_mph":null,"data_date":"2026-09-25","documents":[],"eng_mfr_mdl":"","engine_horsepower":null,"engine_maker":"","engine_model":"","engine_thrust_lb":null,"expiration_date":"2032-08-31","fractional_owner":0,"is_company":1,"is_electric":0,"is_unmanned_cert":0,"kit_mfr":"","kit_model":"","last_action_date":"2025-08-26","maker":"Stemme Gmbh & Co","maker_country":null,"maker_raw":"STEMME GMBH & CO","maker_segment":null,"mfr_mdl_code":"1130872","mode_s_code":"51465530","mode_s_hex":"A66B58","model":"S10-VT","n_number":"N5121","name":"MOUNTAIN STEMME LLC","num_engines":1,"other_names":"","plain_english":"N5121 is a Stemme Gmbh & Co S10-VT, a glider with a four-stroke engine. It has 2 seats. It is registered to Mountain Stemme LLC, an LLC in Boulder, Colorado. The registration is valid: it was issued on August 26, 2025 and expires on August 31, 2032. No airworthiness certificate is on file, which is normal for drones and for aircraft still being built or tested.","region":"Northwest Mountain","region_code":"S","registrant_type":"LLC","registrant_type_code":"7","seats":2,"serial_number":"11-023","source":"FAA Civil Aviation Registry, Releasable Aircraft Database","state":"CO","status":"Valid registration","status_code":"V","status_short":"Valid","street":"PO BOX 17088","street2":"","type_aircraft":"Glider","type_aircraft_code":"1","type_engine":"Four-cycle piston","type_engine_code":"8","unique_id":"00085752","url":"https://staging.data.eflight.com/aircraft/N5121","watchlist_group":null,"watchlist_note":null,"weight_class":"","year_mfr":null,"zip":"803080088"}