For permanently closed runways the X's shall be painted on the surface at intervals not to exceed ____ ft.

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Multiple Choice

For permanently closed runways the X's shall be painted on the surface at intervals not to exceed ____ ft.

The main idea is how closed runways are clearly marked to prevent use. Permanently closed runways get large X markings painted across the pavement at regular intervals along the surface so pilots can see the closure from distance and from different approaches. The required spacing is not to exceed 1000 feet. This distance keeps the closure visible throughout the length of the runway, reducing the chance of a pilot missing that portion is not usable. If the marks were spaced farther apart, a closed condition could be missed, especially in low visibility or at a distance. Keeping the Xs within 1000 feet strikes a practical balance between visibility and effort.

The main idea is how closed runways are clearly marked to prevent use. Permanently closed runways get large X markings painted across the pavement at regular intervals along the surface so pilots can see the closure from distance and from different approaches. The required spacing is not to exceed 1000 feet. This distance keeps the closure visible throughout the length of the runway, reducing the chance of a pilot missing that portion is not usable. If the marks were spaced farther apart, a closed condition could be missed, especially in low visibility or at a distance. Keeping the Xs within 1000 feet strikes a practical balance between visibility and effort.

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