| 摘要 |
Maneuvering commands are displayed to an aircraft pilot by three conspicuous bars on a background panel that has horizontal and vertical axes of symmetry. The bars swing about their ends nearest the intersection of said axes. Two bars, extending symmetrically to opposite sides of the vertical axis signify pitch maneuvers, being aligned with the horizontal axis when pitch is satisfactory or inclined to it in the direction of required pitch change. The third bar is aligned with the vertical axis when heading is satisfactory or inclined to it in the direction of required heading change.
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