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Although automatic flight control systems fairly lighten the pilots' workloads, they may fail as the other systems. In these systems, sensors, actuators and the control surface failures can cause undesirable results to arise. However, it can be possible to tolerate the failures in flight control systems by using what is known in literature as fault tolerant control which makes the operations of systems possible against some types of failures. The fault tolerant control is composed of detection of failures, isolation, and reconfiguration of system stages. Herein, an application is made for the fault detection of a helicopter by observer equipment using lateral movement equations. The application allows user to have an opinion for conditions that can not be directly measured as well as the fault detection based on comprehensive condition estimate. [ABSTRACT FROM AUTHOR]

Maintaining desired flight conditions in flight envelope for a long period is the primary control problem in aircraft flight control. Due to internal and external disturbances, dynamic behaviour of aircraft may change in a short period of time. Thus a control system designed for a flight condition, may not provide the desired stability and performance characteristics in case of deviation from the equilibrium point. There are numerous studies regarding flight control in the literature. Most of the applications about the design of fuzzy flight control are in simulation level. In this study, the design of classical and fuzzy PD controller for the altitude control system is analyzed and the results are compared for a very large four-engine passenger jet aircraft. [ABSTRACT FROM AUTHOR]