What type of actuation does pitch trim utilize?

Pitch trim in aircraft primarily utilizes electronic actuation systems. This is due to the integration of advanced flight control systems that allow for more precise and responsive control compared to traditional mechanical methods. Electronic pitch trim systems typically involve the use of electronic signals sent to the trim actuators, which adjust the position of the control surfaces to relieve the pilot from the continuous need for manual control inputs.

This method enhances both safety and efficiency, allowing for automated adjustments that compensate for changes in aircraft load or aerodynamic conditions without requiring direct pilot intervention. Additionally, the electronic system interacts with the aircraft's avionics to provide feedback and allow for smoother control laws, improving the overall handling characteristics of the aircraft.

Other systems, like hydraulic or pneumatic actuation, are more suited for other aircraft systems, such as landing gear or flight control surfaces, but do not apply to pitch trim in this context. Mechanical actuation systems, while simpler, do not offer the flexibility and precision that electronic actuation provides, especially in modern aircraft designs. Thus, the choice of electronic actuation reflects current trends in aviation technology towards greater automation and enhanced pilot assistance.