10/31/2007. This tandem two-seat primary-basic trainer was fully aerobatic and had provisions for four pylons for external stores. It was first flown on May 26, 1977 and deregistered on May 12, 2003. A redesigned and turboprop powered second prototype (NDN-1T, G-FSTS c/n 006) was entered in the competition for a new RAF trainer, eventually won by the Embraer/Short Tucano.