For a flap protection system with a hydraulic circuit, what is the state of the flaps when commanded down above extension speed?

• A. They extend to the full down position
• B. They remain locked in the up position
• C. They partially extend
• D. They float freely

Answer: (B)

Flap protection uses a hydraulic interlock to guard against extending the flaps when airspeed is too high. If the flaps are commanded down but the aircraft is above the extension speed, the system engages a lockout that prevents movement and holds the flaps in the up (stowed) position. This stops any attempt to extend at speeds where the flaps could be stressed or control forces could become unsafe. Once the speed falls below the extension limit, normal extension can occur again if commanded, but at high speeds the protection keeps the flaps locked up.