In autopilot operation, which signal can nullify the input signal to the ailerons?

In autopilot operation, which signal can nullify the input signal to the ailerons?

• A. Attitude hold
• B. Rate command
• C. Follow up
• D. Roll hold

Answer: (C)

In autopilot control, a nulling or canceling effect on the aileron input comes from a follow-up (feedback) signal. This feedback path senses the actual aileron position and feeds a signal back to the input in such a way that it cancels the external command when no corrective action is needed. In other words, it can make the net signal to the ailerons zero, so the surface stays put unless the autopilot actively commands a change. Other modes like attitude hold or roll hold generate commands to maintain a certain roll condition, and rate command drives actions to achieve a desired roll rate. They respond to errors but don’t inherently cancel the pilot’s input; they produce corrective deflections rather than nullifying the input signal.

In autopilot control, a nulling or canceling effect on the aileron input comes from a follow-up (feedback) signal. This feedback path senses the actual aileron position and feeds a signal back to the input in such a way that it cancels the external command when no corrective action is needed. In other words, it can make the net signal to the ailerons zero, so the surface stays put unless the autopilot actively commands a change.

Other modes like attitude hold or roll hold generate commands to maintain a certain roll condition, and rate command drives actions to achieve a desired roll rate. They respond to errors but don’t inherently cancel the pilot’s input; they produce corrective deflections rather than nullifying the input signal.