In the event of total hydraulic power failure, rotation of the pilots’ controls wheels _________ positions the ailerons.

Question

BlackTom AI · Accepted Answer

When analyzing how the pilots’ control wheels affect the ailerons during a total hydraulic power failure, we must consider how control surfaces are actuated under such a condition.
Option 1: mechanically. In many aircraft designs, the primary control surfaces are connected to the pilot’s control wheels via a mechanical linkage (cables, pulleys, or rods) that transmits input directly to the ailerons. Even if hydraulics fail, this mechanical path can still move the surfaces, assuming no other hydraulic or electronic augmentation is required. This makes sense as a fail-safe fallback when hydraulic systems are unavailable.
Option 2: pneumatically. Pneumatic actuation relies on compressed air to move surfaces. If there is a total hydraulic power failure, pneumatic systems are not automatically guaranteed to function unless they have an independent power source or separate hydraulic-to-pneumatic actuation chains. Since the scenario specifies total hydraulic failure, this option would not be the default mechanism to move the ailerons in response to wheel input.
Option 3: electrically. Electrical actuation would involve motors or electro-hydraulic conversions driven by electrical power. In a total hydraulic power failure, unless there is a separate electrical system powering the actuators (which is not implied), relying on electric actuation to move the ailerons would not be feasible. Therefore, electric actuation is unlikely to be the immediate means of movement in a hydraulic failure scenario.
From a reasoning standpoint, the statement that the wheels rotate to move the ailerons in a manner that does not depend on hydraulic power points to a direct, mechanical linkage as the robust fallback. The other options presume independent pneumatic or electrical actuation paths that would not operate under a total hydraulic failure unless explicitly designed with separate power sources, which the prompt does not indicate.
In summary, given total hydraulic power loss, the most reliable mode of transmitting pilot input to the ailerons is through a mechanical linkage, while pneumatic or electrical actuation would require alternative independent systems that are not described here.

AS 411 Exam 03

In the event of total hydraulic power failure, rotation of the pilots’ controls wheels _________ positions the ailerons.

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