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The Velveteen Ocelot

(131,652 posts)
7. It will depend on the wind, the visibility and the cloud bases.
Sun Oct 28, 2012, 09:10 PM
Oct 2012

I think the AF1 the Prez is using right now is the 757, not the big 747 we are used to seeing. The maximum demonstrated crosswind component for a 757 is something like 36 knots, so if there is a direct crosswind of more than 36 knots on the runway of intended landing they'd have to go somewhere else. Also, there are visibility restrictions. I'm not sure if the Air Force uses the same limits as commercial airlines, but if so they'd have to have some certain forward visibility on landing (called Runway Visual Range, RVR), probably at least 1600 feet with certain runway lights visible, and cloud bases would have to be at least 200', less than that OK with certain equipment (autoland, CAT II or III certification). Right now the weather is better than that in DC, http://www.wunderground.com/Aviation/index.html?query=KDCA so if they go now they'll be fine. The forecast for DCA, which is close to Andrews, indicates that the wind won't get really bad until after midnight.

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