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Guest FrancoisH

Question about lateral wind !

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Guest FrancoisH

Hello, I've a question about the lateral wind and the Heading mode of the autopilot.Is that normal when I select heading to 040

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Guest Ricardo Sevarant

Your navigation display has a fixed 'lubber line' that depicts the aircraft's actual groundtrack at all times on the moving map dispay. It is important to distinguish between ground track and aircraft heading. Your aircraft's actual heading is displayed by a small tick mark above the compass arc on the display. The angle between the lubber line and the heading tick mark is the wind drift correction angle. If the heading tick mark and lubber line are matched up, then you have no wind drift correction. Your aircraft's actual heading and groundtrack are the same. If the heading tick mark is to the left of the lubber line ground track, your aircraft's heading is offset to the left of your actual groundtrack. This would be the case if you are tracking a course and have a wind component from the left. If the heading tick mark is to the right of the lubber line, your aircraft's heading is offset to the right of your actual groundtrack. In this case, you have a wind drift component from the right. By simply aligning the lubber line (by manuevering the aircraft) on the navigation display so that it is parallel and on top of the magenta display course track line, you are putting your aircraft on a wind corrected heading to track your course centerline automatically. The aircraft's inertial reference system has done all the work for you. :) Now, if you are flying a Piper Cub without a GPS or VOR installed, you'll have to plot your course on a sectional chart, then get a winds aloft forecast, then calculate your heading and wind drift correction manually :) Mr. Boeing on the other hand, does it all for you :)

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Guest FrancoisH

Ah I see, it give Ground Track of my course on the map display and not my current heading, I understand ! So I just have to set ground heading to match my desired real heading, this will automatically put me on a true and good magnetic heading despite of the wind...Thanks you !

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