can operate the rudder.

Question

BlackTom AI · Accepted Answer

The question appears to ask which hydraulic system can operate the rudder. 
Option 1: 'Only the A hydraulic system' restricts rudder operation to a single system. If the correct answer is 'Any hydraulic system', this option would be incorrect because it unnecessarily limits functionality to system A. 
Option 2: 'Only the standby system' suggests rudder control is exclusive to a standby unit, which would fail to account for normal operation using other hydraulics. This would be incorrect if the rudder can be actuated by other hydraulics during normal or alternate modes. 
Option 3: 'Only the B hydraulic system' is similar to Option 1 but limits to system B; again, this would be incorrect if other hydraulic systems can also operate the rudder. 
Option 4: 'Any hydraulic system' posits that the rudder can be actuated by any available hydraulic system, which is consistent with designs that provide redundancy and cross-bleed or shared actuation pathways, ensuring rudder control even if one system fails. This understanding aligns with typical aircraft or vessel hydraulic logic where multiple circuits may drive same control surfaces for reliability. 
In evaluating these, the key misconception in the first three choices is assuming exclusive control by a single system or a standby only, whereas redundancy and multiple hyd systems commonly exist to guarantee control. The phrasing of the question as presented suggests the correct concept is that rudder operation is not restricted to a single hydraulic circuit but can be achieved by any available hydraulic system, supporting the choice that reflects full redundancy. 
Therefore, the option stating 'Any hydraulic system' best fits the idea of flexible, redundant actuation of the rudder, while the other options incorrectly impose exclusivity on one system or a standby.

AS 411 Exam 03

can operate the rudder.

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