Where does the conical surface end relative to the runway centerline?

Where does the conical surface end relative to the runway centerline?

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

Answer: (A)

The concept being tested is how obstacle limitation surfaces around a runway are defined and where the conical portion ends. The conical surface starts at the end of the runway and extends outward in a cone, with height increasing as you move away from the runway. It is bounded by a fixed distance from the runway centerline, at which point this cone ends and other surfaces (like the horizontal surface) take over for obstacle protection. That boundary distance is 14,500 feet from the runway centerline. At that radius, the conical surface stops, and the transition to the next surface is made. This is why the correct choice references the 14,500-foot distance from the centerline. Distances from the runway edge or shorter/longer centerline measurements don’t fit the established design criteria, so they aren’t correct.

The concept being tested is how obstacle limitation surfaces around a runway are defined and where the conical portion ends. The conical surface starts at the end of the runway and extends outward in a cone, with height increasing as you move away from the runway. It is bounded by a fixed distance from the runway centerline, at which point this cone ends and other surfaces (like the horizontal surface) take over for obstacle protection.

That boundary distance is 14,500 feet from the runway centerline. At that radius, the conical surface stops, and the transition to the next surface is made. This is why the correct choice references the 14,500-foot distance from the centerline.

Distances from the runway edge or shorter/longer centerline measurements don’t fit the established design criteria, so they aren’t correct.