The nosewheel steering system is __________ controlled __________, actuated steer-by-wire system.

• A. Electronically, Hydraulically
• B. Mechanically, Electrically
• C. Electrically, Pneumatically
• D. Hydraulically, Electrically

Answer: (A)

Steer-by-wire nosewheel systems use electronic control of the steering input with hydraulic actuation. The pilot’s tiller input is captured by sensors and processed by steering control electronics, which determine the commanded nosewheel angle. The actual turning is performed by hydraulic actuators that translate those electronic commands into motion. This setup allows precise, high‑force steering without a mechanical linkage and enables features like speed‑dependent limits and automatic centering. If it were mechanically controlled, there would be a direct linkage; if it were pneumatically actuated, the power source would be air rather than hydraulics; and if hydraulics controlled the system electronically, the control wouldn’t be steer-by-wire as described.