The main difference between CAT II / CAT III operations is that Category II provides sufficient visual reference to permit a manual landing at DH, whereas Category III does not provide sufficient visual references and requires an automatic landing system.Click to see full answer. Likewise, what is a CAT III approach? ICAO and FAA CAT III definitions A CAT III operation is a precision approach at lower than CAT II minima. A category III A approach is a precision instrument approach and landing with no decision height or a decision height lower than 100ft (30m) and a runway visual range not less than 700ft (200m).Additionally, what is a Category 3 aircraft? Commercial aircraft and their pilots are rated either category II or category III for restrictions on flying instrument approaches. Cat III allows the aircraft to shoot the approach in much poorer visibility (lower ceiling and less visibility) and descend further than cat II. In respect to this, what is Cat 2 approach? “Category II (CAT II) operation” means a precision instrument approach and landing with a. decision height lower than 200 feet (60 meters) but not lower than 100 feet (30 meters) and a. RVR of not less than 350 meters; “Category IIIA (CAT IIIA) operation” means a precision instrument approach and landing with.What is cat in aviation?Clear Air Turbulence (CAT) is defined as sudden severe turbulence occurring in cloudless regions that causes violent buffeting of aircraft. This term is commonly applied to higher altitude turbulence associated with wind shear.