Where does the ADF receive the 26 VAC synchro reference voltage?

Where does the ADF receive the 26 VAC synchro reference voltage?

• A. The Number 1 Circuit Breaker Panel
• B. The Main Console
• C. The Instrument Rack
• D. The Number 2 Circuit Breaker Panel

Answer: (D)

The ADF’s indicator and receivers rely on a stable 26 VAC synchro reference to drive the synchro motor and related electronics. In this aircraft, that reference is provided on a dedicated 26 VAC synchro reference bus tied to a specific circuit breaker panel. The Number Two Circuit Breaker Panel supplies that reference, ensuring the ADF gets the required 26 VAC independently from the main power distribution. Other panels or consoles don’t serve as the source for this particular reference signal, so the Number Two panel is the correct source.

The ADF’s indicator and receivers rely on a stable 26 VAC synchro reference to drive the synchro motor and related electronics. In this aircraft, that reference is provided on a dedicated 26 VAC synchro reference bus tied to a specific circuit breaker panel. The Number Two Circuit Breaker Panel supplies that reference, ensuring the ADF gets the required 26 VAC independently from the main power distribution. Other panels or consoles don’t serve as the source for this particular reference signal, so the Number Two panel is the correct source.