Lateral separation provided for an aircraft on an established airway or route and within how many miles from the NAVAID is 4 miles either side of the center line?

Lateral separation provided for an aircraft on an established airway or route and within how many miles from the NAVAID is 4 miles either side of the center line?

• A. 25 miles
• B. 51 miles
• C. 60 miles
• D. 75 miles

Answer: (B)

The main idea is how far from a navigation aid you can rely on a fixed lateral separation of 4 miles on each side of the airway centerline. This guaranteed 4-mile corridor exists only within a certain distance from the NAVAID, where the navigation signal and the controller’s surveillance provide the needed reliability. That distance is 51 miles. So, up to 51 miles from the NAVAID, you can maintain 4 miles of lateral separation on either side of the centerline. Beyond that, the standard lateral protection isn’t guaranteed, so the 4-mile offset isn’t assured. The other distances don’t match the governing limit for this lateral separation.

The main idea is how far from a navigation aid you can rely on a fixed lateral separation of 4 miles on each side of the airway centerline. This guaranteed 4-mile corridor exists only within a certain distance from the NAVAID, where the navigation signal and the controller’s surveillance provide the needed reliability. That distance is 51 miles. So, up to 51 miles from the NAVAID, you can maintain 4 miles of lateral separation on either side of the centerline. Beyond that, the standard lateral protection isn’t guaranteed, so the 4-mile offset isn’t assured. The other distances don’t match the governing limit for this lateral separation.