What is a Trimmable Horizontal Stabilizer(THS)? Why THS is Required? How THS operates? Aircraft Trim

Hi. In this video we look at an important control surface: The Trimmable Horizontal Surface. We see why THS is required in an aircraft by looking at what is meant by Trimming an Aircraft or Aircraft Trim. We also see how the THS operates and assists in Trimming the aircraft, flying the aircraft smoothly and reducing the drag that is acting on the elevator. We also see how the auto pilot and the pilot deflect the THS depending on the requirement. Have Fun!