For LF/MF airways with an NDB on each end, what is the opening angle on each side of the centerline?

In aviation, the opening angle for LF/MF (Low Frequency/Medium Frequency) airways equipped with a Non-Directional Beacon (NDB) at each end is a specified angle that defines the lateral limits of the airway. For LF/MF airways, the standard opening angle from the centerline is indeed 5 degrees on each side.

This angle is established to create a protected airspace corridor for aircraft navigating along the airway, allowing for a certain degree of lateral deviation from the centerline while still maintaining a safe separation from other air traffic and obstacles. The 5-degree angle thus ensures that pilots can effectively receive and interpret the NDB signals while also accounting for variations in flight path.

The importance of this angle lies in its role in navigation and air traffic management, providing clear guidelines for safe spacing between aircraft operating in the same airspace sector. The standardization of this opening angle helps maintain a predictable and safe flying environment.