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, rigor ous analytical approach applied to a linear version of the aircraft mo del. These criteria are for departure caused by aerodynamic disturbanc es only. It is shown that these indicators are limited in their accura cy because of restrictive assumptions and terms omitted. A second appr oach is presented that leads to the same results as the first, but is more applicable to the nonlinear problem. Some ideas concerning the ap plication of the linear methods to the nonlinear problem are presented .