The Conical Surface extends horizontally for how many feet?

The Conical Surface extends horizontally for how many feet?

• A. 2,000 ft
• B. 3,000 ft
• C. 5,000 ft
• D. 4,000 ft

Answer: (D)

The obstacle limitation surfaces define controlled volumes around an airport to keep airspace clear for aircraft on approach and departure. The conical surface is the portion that fans out from the outer edge of the horizontal surface, extending horizontally a fixed distance from that edge. That distance is 4,000 feet. So the conical surface reaches 4,000 feet from the runway’s horizontal surface, forming a cone shape as height increases with distance. This fixed horizontal extent is why four thousand feet is the correct answer.

The obstacle limitation surfaces define controlled volumes around an airport to keep airspace clear for aircraft on approach and departure. The conical surface is the portion that fans out from the outer edge of the horizontal surface, extending horizontally a fixed distance from that edge. That distance is 4,000 feet. So the conical surface reaches 4,000 feet from the runway’s horizontal surface, forming a cone shape as height increases with distance. This fixed horizontal extent is why four thousand feet is the correct answer.