Which of the following is not powered by both hydraulic system A and B

Question

BlackTom AI · Accepted Answer

To tackle the question, I’ll examine what each hydraulic system typically powers on aircraft that use a dual A/B configuration.
Option 1: landing gear. In many aircraft, the landing gear extension/retraction and associated actuators can be powered by both hydraulic systems A and B to ensure redundancy and reliable operation during different flight phases. This makes it plausible that landing gear is powered by both.
Option 2: rudder. The rudder control surfaces are usually driven by hydraulic actuators fed by more than one system (A and B) to provide adequate yaw control and safety in the event one system is unavailable.
Option 3: ground spoilers. Ground spoilers are deployed on landing to spoil lift and increase braking effectiveness. In some aircraft designs, ground spoilers may be driven by a single hydraulic power source rather than both A and B, due to design optimization or specific sequencing when the aircraft is on the ground. This makes ground spoilers a candidate for not being powered by both systems.
Option 4: ailerons. Aileron control surfaces are typically actuated by hydraulic circuits connected to both systems A and B to preserve roll control and redundancy across flight regimes.
Therefore, among the listed components, the one that is not powered by both hydraulic system A and B is often the ground spoilers, which can be served by a single hydraulic source depending on the aircraft’s hydraulic architecture.

AS 411 Exam 03

Which of the following is not powered by both hydraulic system A and B

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