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Sonex Aircraft Sonex Sport Acro Sonex Aircraft LLC N123SX 0008 Fatalities: 2 / Occupants: 2 0 Substantial Accident East of Wittman Regional Airport (KOSH), Oshkosh, WI - United States of America Take off Private Wittman Rgnl Airport (KOSH) Wittman Rgnl Airport (KOSH) NTSB

The aircraft, an experimental Monnett built Sonex SA, impacted vehicles and terrain shortly after takeoff from Wittman Regional Airport (KOSH), Oshkosh, Wisconsin. The airplane sustained substantial damage and the two occupants onboard received fatal injuries. The occupants onboard were identified as Sonex Aircraft CEO Jeremy Monnett and Sonex Aircraft assembly mechanic Michael Clark. Jeremy Monnett is the son of Sonex Founder John Monnett.



Probable Cause and Findings: "The National Transportation Safety Board determines the probable cause(s) of this accident to be:The pilot's failure to maintain sufficient airspeed following a loss of engine power during initial takeoff climb, which resulted in the airplane's wing exceeding its critical angle-of-attack and a subsequent aerodynamic stall. The reason for the loss of engine power could not be determined because examination of the wreckage revealed no mechanical deficiencies. Contributing to the accident was the pilot's decision to conduct an intersection takeoff."



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