If hydraulic system B fails, is there a backup for the flaps?

If hydraulic system B fails, is there a backup for the flaps?

• A. No backup exists.
• B. Yes, the A hydraulic system powers the flaps.
• C. Yes, electric flaps.
• D. Yes, the standby hydraulic system powers the flaps.

Answer: (C)

When flap actuation can be driven by more than one power source, a true backup means the system can still operate even if the primary (hydraulic) source fails. In this scenario, electric flap actuation provides that independent path: electric motors powered by the aircraft’s electrical system can move the flaps without relying on hydraulic pressure. That ensures you can still extend or retract the flaps for approach and landing even if hydraulic system B has failed. The standby hydraulic system isn’t relied upon for flap movement here, so electric flaps serve as the practical backup.

When flap actuation can be driven by more than one power source, a true backup means the system can still operate even if the primary (hydraulic) source fails. In this scenario, electric flap actuation provides that independent path: electric motors powered by the aircraft’s electrical system can move the flaps without relying on hydraulic pressure. That ensures you can still extend or retract the flaps for approach and landing even if hydraulic system B has failed. The standby hydraulic system isn’t relied upon for flap movement here, so electric flaps serve as the practical backup.