Plain English Meaning

When two ILS approaches at the same airport cross each other, the angle where their final approach paths meet must be somewhere between 15 and 100 degrees for them to be used at the same time as a Converging ILS Approach.

Full Definition

The angular range used to define a Converging ILS Approach. Converging ILS approaches are authorized only when the angle between the final approach courses of the two intersecting ILS procedures is at least 15 degrees and no greater than 100 degrees. Below 15 degrees the courses are too close to provide adequate lateral separation between aircraft; above 100 degrees the geometry is no longer considered converging for procedural purposes.

Context Anchor

Seen in instrument approach procedure discussions for to whose final approach paths toward each other.