Which unit provides the 26 VAC synchro reference for the ADF system?

Which unit provides the 26 VAC synchro reference for the ADF system?

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

Answer: (D)

The key idea is that the ADF’s bearing information relies on a stable 26 VAC synchro reference that comes from a dedicated power source in the aircraft’s electrical system. This reference is not produced by the main console or the instrument panel, and it’s not routed through the other general breaker panels. Instead, it is fed from the specific circuit breaker panel that is designated to supply the ADF’s synchro reference circuit. Because only that panel provides the proper, isolated 26 VAC reference for the ADF’s synchro system, it is the unit that supplies the reference voltage.

The key idea is that the ADF’s bearing information relies on a stable 26 VAC synchro reference that comes from a dedicated power source in the aircraft’s electrical system. This reference is not produced by the main console or the instrument panel, and it’s not routed through the other general breaker panels. Instead, it is fed from the specific circuit breaker panel that is designated to supply the ADF’s synchro reference circuit. Because only that panel provides the proper, isolated 26 VAC reference for the ADF’s synchro system, it is the unit that supplies the reference voltage.