AUTOPILOT SYSTEM FOR AN UNMANNED AERIAL VEHICLE (UAV) contains Autonomous Navigation and Control system for a fixed wing plane (Autopilot system). The project includes the Adaptive Neuro Fuzzy Inference Based Control system Development, and programming it into single board computer installed in the model aircraft. The software architecture was developed using C++ language in Linux operating system. All sensors, necessary for the control are interfaced with the system. It also includes Live data transmission with graphical representation in MATLAB (defining all states of the aircraft during flight); live video transmission for surveillance purpose and Intelligent control system for Online System Identification was developed & tested on a real flight.