All aircraft have instruments to let the pitot know what is happening to his airplane in flight, his position (navigation) and the operation of his engine. The first system we will talk about is the pitot-static system and the instruments the system operates.
The pitot-static system is very simple, but very important, because it operates some of the primary flight instruments. The system is based on a difference in air pressure using ram air pressure (trapped air pressure) and static .(still air pressure)