IAC control receives the audio error signal and produces which signal?

IAC control receives the audio error signal and produces which signal?

• A. Bearing Hold
• B. Audio Error
• C. ADF Valid Signal
• D. 26 VAC Reference

Answer: (A)

IAC control operates as a feedback navigator: it uses the difference between the target bearing and the actual bearing (the audio error) to generate a corrective command. This corrective output is a bearing hold signal, which drives the aircraft’s heading control to maintain the selected bearing to the station. In short, the audio error is the input that the controller uses to produce a bearing hold command so the aircraft stays on the desired track. The other signals are not outputs of this process: the ADF Valid signal is just a status flag, the 26 VAC Reference is a power/reference line, and the audio error itself is the input to the IAC, not the output.

IAC control operates as a feedback navigator: it uses the difference between the target bearing and the actual bearing (the audio error) to generate a corrective command. This corrective output is a bearing hold signal, which drives the aircraft’s heading control to maintain the selected bearing to the station. In short, the audio error is the input that the controller uses to produce a bearing hold command so the aircraft stays on the desired track. The other signals are not outputs of this process: the ADF Valid signal is just a status flag, the 26 VAC Reference is a power/reference line, and the audio error itself is the input to the IAC, not the output.