# Key Takeaways
- Either primary or secondary control systems
- Primary systems are required to control the aircraft
- Secondary systems improve performance or relieve forces
- Primary control surfaces include rudder, aileron, elevator
- Secondary control surfaces include trim, flaps
# Details
Most trainer aircraft use a series of pulleys, rods, and cables. More sophisticated aircraft may be "fly-by-wire".
><a title="Piotr Jaworski; PioM EN DE PL (Poznań/Poland), CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>, via Wikimedia Commons" href="https://commons.wikimedia.org/wiki/File:ControlSurfaces.gif"><img width="256" alt="Basic Flight Controls" src="https://upload.wikimedia.org/wikipedia/commons/b/b8/ControlSurfaces.gif?20071109154628"></a>
>By Piotr Jaworski; PioM EN DE PL (Poznań/Poland), [CC BY-SA 3.0](http://creativecommons.org/licenses/by-sa/3.0/), via Wikimedia Commons
The primary flight controls allow movement around one of three airplane axes.
![[Axes of Airplane.jpeg]]
# Additional Resources
- [[PHAK Ch6]]
#concept