During normal flight with a vacuum driven attitude indicator, control pressures normally should not move the horizon bar more than

Question

BlackTom AI · Accepted Answer

The question asks about how much the horizon bar should move during normal flight when using a vacuum-driven attitude indicator.
Option A: 'One-half bar width, with not more than an additional one-half bar width for normal flight deviations.' This suggests the initial movement is half a bar, and any further deviation is limited to another half bar. In standard practice, the allowable extra movement for normal deviations is larger (one full bar), so this option underestimates the permissible movement.
Option B: 'One-half bar width, with not more than an additional one bar width for normal flight deviations.' This statement sets an initial limit of half a bar and allows an additional full bar of movement during normal deviations, totaling up to one and a half bars. This aligns with typical aviation guidance that modest initial movement is permitted, followed by a larger allowance for deviations, which matches standard practice for attitude indicator sensitivity in normal flight.
Option C: 'One bar width, with not more than an additional one bar width for normal flight deviations.' Here the horizon bar starts at one bar width of deflection, which already exceeds the common initial limit used in normal flight scenarios, making this option disproportionately large in normal operations.
Overall, the reasoning hinges on distinguishing the baseline movement from the permissible extra movement during normal flight, and recognizing that starting with one-half bar plus an additional one bar width is the conventional approach, whereas the other two options either understate or overstate the allowable movement for normal flight deviations.

During normal flight with a vacuum driven attitude indicator, control pressures normally should not move the horizon bar more than单项选择题

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