accelerations due to excitation of the natural modes of an aircraft &# 39 ; s body are suppressed by an active suppression system . dedicated accelerometers are positioned in the aircraft at optimal locations for sensing modal induced lateral accelerations . the accelerometer produced signals are processed through control logic which , in response thereto , and in response to aircraft velocity and altitude related signals produces output control signals . the control signals effect rudder deployment creating forces to suppress the natural mode induced accelerations .