What provides control if both A and B hydraulic systems have failed?

What provides control if both A and B hydraulic systems have failed?

• A. Standby hydraulic system.
• B. Nose-wheel steering.
• C. Manual reversion provides control of Ailerons and Rudders.
• D. Electronic flight control.

Answer: (C)

When both hydraulic systems fail, the aircraft still has a mechanical backup that preserves control: manual reversion. This setup directly connects the cockpit controls to the ailerons and rudder through cables or mechanical linkages, bypassing hydraulic actuators. So even with no hydraulic power, you can still command roll and yaw, maintaining basic flight through a direct, physical connection. It’s understood that manual reversion requires more effort and provides reduced authority, but it’s the guaranteed way to keep control when hydraulics are dead. A standby hydraulic system might offer some emergency power if available, but the scenario assumes primary hydraulics are out, so the direct mechanical control via manual reversion is the reliable fallback.

When both hydraulic systems fail, the aircraft still has a mechanical backup that preserves control: manual reversion. This setup directly connects the cockpit controls to the ailerons and rudder through cables or mechanical linkages, bypassing hydraulic actuators. So even with no hydraulic power, you can still command roll and yaw, maintaining basic flight through a direct, physical connection. It’s understood that manual reversion requires more effort and provides reduced authority, but it’s the guaranteed way to keep control when hydraulics are dead. A standby hydraulic system might offer some emergency power if available, but the scenario assumes primary hydraulics are out, so the direct mechanical control via manual reversion is the reliable fallback.