Plain English Meaning

It's the side-to-side guidance an MLS gives you on approach. It tells the aircraft how far left or right of the runway centerline it is, so the pilot or autopilot can line up correctly with the runway.

Full Definition

In a Microwave Landing System (MLS), the approach azimuth is the lateral guidance signal that tells the aircraft its left-right position relative to the runway centerline during the final approach. It is transmitted from a ground station located beyond the stop end of the runway and provides horizontal course information across a wide angular sector, allowing curved or offset approach paths in addition to a .