What is the extension ratio of the transitional surface?

What is the extension ratio of the transitional surface?

• A. 7:1
• B. 20:1
• C. 50:1
• D. 34:1

Answer: (A)

The extension ratio describes how the transitional surface climbs away from the runway end. It sets how far the surface extends horizontally for a given vertical rise, defining the slope of that protection zone. For transitional surfaces around runways, the standard slope is 7 units horizontally for every 1 unit of vertical rise. Put another way, for every 7 meters you move out from the runway end, the surface height increases by 1 meter. This keeps obstacles from encroaching on the flight path as aircraft approach or depart. The 7:1 ratio matches this widely used standard, while the other options do not reflect the typical transitional-surface slope.

The extension ratio describes how the transitional surface climbs away from the runway end. It sets how far the surface extends horizontally for a given vertical rise, defining the slope of that protection zone. For transitional surfaces around runways, the standard slope is 7 units horizontally for every 1 unit of vertical rise. Put another way, for every 7 meters you move out from the runway end, the surface height increases by 1 meter. This keeps obstacles from encroaching on the flight path as aircraft approach or depart. The 7:1 ratio matches this widely used standard, while the other options do not reflect the typical transitional-surface slope.