Agray sky darkens ominously to near black as corporate pilot David Perdaris prepares to land a Westwind II twin jet on Dallas/Fort Worth International Airport's Runway 17 Center. Perdaris, 33, has the landing gear down and flaps set, and tracks the ILS as the sound of rain beating against the windshield intensifies. As he descends through 1,000 feet agl, the Westwind's on-board sensors note a gathering headwind-a possible wind shear precursor.
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