{"airworthiness_class":"Experimental","airworthiness_date":"2021-06-17","airworthiness_ops":"Amateur built","category":"conventional","cert_issue_date":"2020-05-12","city":"NEENAH","country_code":"US","county_code":"139","cruise_speed_mph":null,"data_date":"2026-10-02","documents":[],"eng_mfr_mdl":"01401","engine_horsepower":80,"engine_maker":"AEROCONVER","engine_model":"AEROVEE","engine_thrust_lb":0,"expiration_date":"2027-05-31","fractional_owner":0,"is_company":0,"is_electric":0,"is_unmanned_cert":0,"kind":"piston-singles","kit_mfr":"SONEX AIRCRAFT LLC","kit_model":"ONEX","last_action_date":"2023-01-22","maker":"Thomas N Helm","maker_country":null,"maker_raw":"THOMAS N HELM","maker_segment":null,"mfr_mdl_code":"05639AQ","mode_s_code":"51602457","mode_s_hex":"A7052F","model":"SONEX ONEX","n_number":"N551X","name":"HELM THOMAS N","ntsb_checked":true,"ntsb_records":[{"city":"Ocala","damage":"SUBS","date":"2009-03-06","highest_injury":"FATL","ntsb_no":"ERA09LA184","probable_cause":"A loss of engine power due to contamination and clogging of the fuel system by a post-assembly fuel tank sealant.","registration":"N551X","state":"FL","summary":"Accident on March 6, 2009 at Ocala, FL: fatal, substantial damage (1 fatal).","type":"ACC"}],"num_engines":1,"other_names":"","plain_english":"N551X is a Thomas N Helm SONEX ONEX, a fixed-wing airplane with one motor with a piston engine, built in 2021. It has 1 seat. It is registered to an individual in Neenah, Wisconsin. The registration is valid: it was issued on May 12, 2020 and expires on May 31, 2027. It holds an experimental airworthiness certificate for amateur built, dated June 17, 2021.","records_check":[{"finding":"Valid registration to Helm Thomas N, an individual, certificate issued May 12, 2020, expires May 31, 2027. No fractional interest recorded.","item":"Registration and identity","source":1,"status":"CLEAR"},{"finding":"Experimental certificate for amateur built, dated June 17, 2021, consistent with the 2021 manufacture year.","item":"Airworthiness certificate","source":1,"status":"CLEAR"},{"finding":"No earlier tail number is recorded against serial ONX0137 for this model in the deregistered file.","item":"Prior registrations of this airframe","source":2,"status":"CLEAR"},{"finding":"N551X was previously assigned to 2 other aircraft: Eldredge Kevin S51 (serial 076, cancelled April 12, 2012); Boeing A75N1 (serial 75267, cancelled July 10, 1995). Histories keyed to the tail number alone can mix aircraft up; this check keys on the serial number.","item":"Tail number reuse","source":2,"status":"ATTENTION"},{"finding":"No bills of sale, loans or releases have reached the registry in recent weeks. The index covers only recent filings; older liens are in the records file.","item":"Recent registry documents","source":3,"status":"NOTE"},{"finding":"1 NTSB record under N551X: Accident on March 6, 2009 at Ocala, FL: fatal, substantial damage (1 fatal). Details below.","item":"Accident and incident record","source":4,"status":"ATTENTION"},{"finding":"These live in the FAA aircraft records file (every document ever filed against the aircraft) and, for larger aircraft, the International Registry. Part of the full report.","item":"Title chain, liens and 337 forms","source":null,"status":"PENDING"},{"finding":"AD compliance against the logbooks and flight-activity reconciliation are researched layers of the full report.","item":"Airworthiness directives and utilization","source":null,"status":"PENDING"}],"records_check_sources":[{"n":1,"name":"FAA Releasable Aircraft Database, master file","url":"https://registry.faa.gov/"},{"n":2,"name":"FAA deregistered aircraft file (part of the same download)","url":"https://registry.faa.gov/"},{"n":3,"name":"FAA document index: registry documents received in recent weeks","url":"https://registry.faa.gov/"},{"n":4,"name":"NTSB aviation accident database (CAROL)","url":"https://data.ntsb.gov/carol-main-public/basic-search"}],"region":"Great Lakes","region_code":"C","registrant_type":"Individual","registrant_type_code":"1","seats":1,"serial_number":"ONX0137","source":"FAA Civil Aviation Registry, Releasable Aircraft Database","state":"WI","status":"Valid registration","status_code":"V","status_short":"Valid","street":"1335 LORI DR","street2":"","type_aircraft":"Fixed-wing, single engine","type_aircraft_code":"4","type_engine":"Piston (reciprocating)","type_engine_code":"1","unique_id":"01316816","url":"https://eflight.com/aircraft/N551X","watchlist_group":null,"watchlist_note":null,"weight_class":"","year_mfr":2021,"zip":"549561998"}