Plain English Meaning

An ILS approach that lets a pilot fly down to 200 feet above the runway in low visibility. At that point the pilot must see the runway environment to continue; if not, they go around.

Full Definition

A precision instrument approach using an Instrument Landing System certified to Category I standards, providing lateral guidance from the localizer and vertical guidance from the glide slope down to a decision height (DH) no lower than 200 feet above the touchdown zone elevation, with a visibility requirement typically no less than 1,800 feet (RVR) or 1/2 .