Aircraft crashes mainly occur either due to human error or hardware fault. The recent
year crash report exposed the ineffectiveness of controller design methodology. There is
an urgent need for research towards the up-gradation of existing methods.

The methodology should be such that they incorporate factors that are responsible for
developing abnormal behavior in the plant. Bifurcation analysis is sufficient for fulfilling
such type of demand. Bifurcation tailoring aided Active Fault-Tolerant Controller(AFTC)
is an appropriate approach for designing the best controller.
The fault-tolerant controller is broadly classified into two sub category passive and active.
The passive FTC has good performance under known types of fault. On the other hand,
an active controller has average possible performances with guaranteed stability under
unknown types of faults.
The Bifurcation tailoring aided Model Reference Adaptive Controller(MRAC) is adopted
to address the stable and adequate performances under faulty conditions
The best approach is to incorporate a nominal controller and active fault-tolerant
controller in the controller architecture. The former provides the desired stability and
performance during non-faculty conditioning. Later provides adequate performance in
faulty conditions
The present work aims to achieve adequate landing performances under various faulty
scenarios(i.e., structural variation, actuator failure, sensor failure, and slow engine
dynamics ) for civil/ fighter aircraft.