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To: devane617

Okay, I call b.s. on this one.
Pilots know how to adjust thier compasses to compensate for magnetic vs. geographic north. Every airport has a compass rose for pilots to align their airplanes. And the only thing they really care about when landing is wind direction.


14 posted on 01/06/2011 3:10:01 PM PST by Excellence (Buy Progresso, take off the label, write "not halal," mail to Campbell's soup company.)
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To: Excellence

Perhaps a little explaination. Runways are designated according to their magnetic bearing, rounded to the nearest 10 degrees. Since a compass has 360 degrees there are 36 possible runway designations, 01 through 36. If the actual alignment of the runway is 352 degrees the runway is designated 35. If the magnetic variation shifts so that the runway aligment becomes 358 degrees then the runway designation becomes 36. The runway designation is painted in very large numerals at the approach end of the runway. So if the runway landing to the north was runway 35, landing to the south it would be runway 17. If the alignment changes enough to redesignate the runway to 36, the numbers 36 would have to be painted on the south end (landing to the north) and the numbers 18 have to be painted on the north end, landing to the south. Having the numbers painted on the runway surface helps to ensure that a pilot does not land on the wrong runway.
As far as the wind is concerned, aircraft generally land into and takeoff into the wind. But you can have intersecting or parallel runways so the aircraft doesn’t always land directly into the wind. Often there is a cross wind. So its not just the direction of the wind but what runway the pilot has been cleared to. Kind of windy, but I hope that helps.


48 posted on 01/06/2011 4:35:45 PM PST by ops33 (Senior Master Sergeant, USAF (Retired))
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