What is the mechanism used by the Horizontal Stab Trim System to set the angle of the horizontal stab?

The correct answer identifies the Horizontal Stab Trim System in the Dassault Falcon 2000LXS as utilizing a jack screw driven by two 28 VDC motors. This design allows for precise control of the horizontal stabilizer's trim angle, which is vital for maintaining stable flight and adjusting the aircraft's pitch attitude.

Using a jack screw mechanism provides the necessary torque to manipulate the angle of the stabilizer while ensuring reliability and accuracy in the control response. The two 28 VDC motors enhance this system's redundancy, allowing for continued functionality even if one motor were to fail. This built-in redundancy is critical for safety, as it means that the trim can still operate effectively if something goes wrong with one motor.

Other mechanisms like hydraulic actuators or configurations involving multiple systems can introduce complexities and potential points of failure that are mitigated in this design. By employing a single jack screw mechanism powered by dual motors, the system maintains efficiency and robustness, making it an optimal choice for the aircraft's control systems. This intricacy supports the overall performance and handling characteristics that are essential in high-performance jets like the Falcon 2000LXS.