How far is a VOR protected on either side of its airway centerline?

A VOR (VHF Omnidirectional Range) is a ground-based radio navigation system for aircraft, and its associated airways—known as VOR airways—have specific lateral protection zones. The standard protective width on either side of the centerline of a VOR airway is 4 nautical miles. This is crucial for ensuring that aircraft receive adequate navigational signal coverage and to minimize the risk of navigational errors that could arise from deviations from the centerline.

The reason this 4 nautical mile protection is established is to accommodate various flight operations while ensuring safety and reliable signal reception. It recognizes that aircraft might not fly perfectly aligned with the airway due to wind, turbulence, or pilot navigation adjustments. This margin allows for some lateral displacement while still maintaining safe navigation within the confines of the designated airway.

Understanding this lateral protection is important for maintaining safe flight operations and following air traffic regulations effectively.