Which statement correctly describes the data provided by the AC REF BUS for the stabilator?

Which statement correctly describes the data provided by the AC REF BUS for the stabilator?

• A. Engine torque data
• B. Navigation data
• C. Stabilator control signals
• D. Stabilator indicator references

Answer: (D)

The data on the AC REF BUS for the stabilator are the indicator references—the values used by cockpit indicators to display the stabilator’s commanded or reference position. This bus supplies the information used to show where the stabilator should be or is referenced to be, not the actual actuator signals that move the surface. The actual control outputs to move the stabilator come from the flight control system via other data paths, so engine torque data and navigation data come from different subsystems, and stabilator control signals aren’t provided as indicator references on this bus.

The data on the AC REF BUS for the stabilator are the indicator references—the values used by cockpit indicators to display the stabilator’s commanded or reference position. This bus supplies the information used to show where the stabilator should be or is referenced to be, not the actual actuator signals that move the surface. The actual control outputs to move the stabilator come from the flight control system via other data paths, so engine torque data and navigation data come from different subsystems, and stabilator control signals aren’t provided as indicator references on this bus.