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A Boeing 737 uses an adjustable stabilizer, moved by a jackscrew, to provide the required pitch trim forces. Generic stabilizer illustrated. A horizontal stabilizer is used to maintain the aircraft in longitudinal balance, or trim: [3] it exerts a vertical force at a distance so the summation of pitch moments about the center of gravity is zero. [4]
The horizontal stabilizer is the fixed horizontal surface of the empennage. A tailplane, also known as a horizontal stabilizer, is a small lifting surface located on the tail behind the main lifting surfaces of a fixed-wing aircraft as well as other non-fixed-wing aircraft such as helicopters and gyroplanes.
Grumman F-14 Tomcat jet fighter during a takeoff, with stabilators deflected upwards. A stabilator is a fully movable aircraft horizontal stabilizer.It serves the usual functions of longitudinal stability, control and stick force requirements [1] otherwise performed by the separate parts of a conventional horizontal stabilizer (which is fixed) and elevator (which is adjustable).
Normally the horizontal stabilizer also known as tailplane is fixed and has a hinged elevator, a stabilator is another method that combines the functions of an elevator and a horizontal stabilizer. The variable-position horizontal stabilizer is governed by the flaperon setting: the settings of the flaperon control produce corresponding changes ...
The elevator is a moveable part of the horizontal stabilizer, hinged to the back of the fixed part of the horizontal tail. The elevators move up and down together. When the pilot pulls the stick backward, the elevators go up. Pushing the stick forward causes the elevators to go down.
The horizontal stabilizer acts like a winglet, reducing induced drag of the rudder. [3] [1] Smaller and lighter T-tails are often used on modern gliders. When the vertical tail is swept, the horizontal tail can be made smaller because it is further rearwards and therefore has a greater lever arm. Tail sweep may be necessary at high Mach numbers.
The front (usually fixed) section of the tailplane is called the horizontal stabiliser and is used to provide pitch stability. The rear section of the tailplane is called the elevator , and is a movable aerofoil that controls changes in pitch, the up-and-down motion of the aircraft's nose.
The MCAS deflects the horizontal stabilizer four times farther than was stated in the initial safety analysis document. [52] Due to the amount of trim the system applies to the horizontal stabilizer, aerodynamic forces resist pilot control effort to raise the nose.