Plain English Meaning

The most common type of ILS approach. The pilot can fly down to 200 feet above the runway on instruments alone. By that point they must see the runway environment to land; if they don't, they go around.

Full Definition

A precision instrument approach using an Instrument Landing System certified to Category I standards, permitting an approach to a decision height (DH) of not less than 200 feet above the touchdown zone elevation and a visibility of not less than 1/2 statute mile (or runway visual range of not less than 1,800 feet, reducible to 1,400 feet with operative touchdown zone and ).