Fitness figure

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fitness figure

(Also called fitness number.) In the United Kingdom, a measure of the fitness of the weather at an airport for the safe landing of aircraft.

The figure F is computed on the basis of corrected values of visibility and cloud height. Observed visibility is adjusted according to intensity of precipitation; and cloud height is corrected for height of nearby obstructions and cloud amount. Further corrections are applied for the cross- runway component of the wind. The most comparable device widely used in the United States is the sliding scale of ceiling and visibility.


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