Estimation and validation of lateral-directional stability/control derivatives for the Flight Training Device of a light aircraft

The lateral-directional flight parameters of ChangGong-91, a light airplane developed by Korean Air, are estimated from flight test data by use of the output error method. The reliability of the flight test measurement is examined in engineering judgment, scatter and Cramer–Rao bound, which turns out to be satisfactory with minor defects. Estimated parameter values are validated by comparing the simulated responses with the ones from actual flight tests. The ChangGong-91 FTD turns out to satisfy the qualification of FAA Level 7 FTD in lateral-directional motion. All the necessary practices for generation of high-fidelity data in lateral-directional motion of a light aircraft are successfully performed in this study.