Unified development of lateral-directional departure criteria

Several frequently used departure prediction indicators for both open- and closed-loop control of Eight are developed using a unified, rigorous analytical approach applied to a linear version of the aircraft model. These criteria are for departure caused by aerodynamic disturbances only. It is shown that these indicators are limited in their accuracy because of restrictive assumptions and terms omitted. A second approach is presented that leads to the same results as the first, but is more applicable to the nonlinear problem. Some ideas concerning the application of the linear methods to the nonlinear problem are presented.