 Reportedly, test flights of the pre-production aircraft proved itself to have promise; during 1958, a production contract was awarded for 100 aircraft.However, another accident occurred when the first pre-production machine ("J-3003") was destroyed in a crash on 25 March 1958 after 102 flights.According to Lombardi, the second crash was a major blow to the project; it has been claimed that the Swiss Government decided to cancel the entire order due to the accidents involved.