What is an ILS approach?

Answer 1

The Instrument Landing System (ILS) is a ground-based instrument approach system that provides precision guidance to an aircraft approaching a runway, using a combination of radio signals and, in many cases, high-intensity lighting arrays to enable a safe landing during instrument meteorologic condition (IMC) such as low ceilings or reduced visibility due to fog, rain, or blowing snow Instrument Approach Procedure charts (or "approach plates") are published for each ILS approach, providing pilots with the needed information to fly an ILS approach during instrument flight rules (IFR) operations, including the radio frequencies used by the ILS components or navaids and the minimum visibility requirements prescribed for the specific approach.