Where does the outer horizontal surface end?

Where does the outer horizontal surface end?

• A. 14,500 ft from the runway centerline
• B. 7,000 ft wide
• C. 500 ft above EAE
• D. 44,500 ft from the runway centerline

Answer: (D)

In obstacle clearance design, the outer horizontal surface is a broad boundary that extends outward from the runway centerline to a fixed distance. That boundary ends at 44,500 feet from the runway centerline, about 8.4 miles. This fixed radial limit defines how far the outer horizontal surface reaches, regardless of height or width parameters. The other numbers refer to different surfaces or vertical distances, not the extent of the outer horizontal surface.

In obstacle clearance design, the outer horizontal surface is a broad boundary that extends outward from the runway centerline to a fixed distance. That boundary ends at 44,500 feet from the runway centerline, about 8.4 miles. This fixed radial limit defines how far the outer horizontal surface reaches, regardless of height or width parameters. The other numbers refer to different surfaces or vertical distances, not the extent of the outer horizontal surface.