Flygolycka i Ukraina

http://en.wikipedia.org/wiki/Instrum...ILS_categories

Category III (CAT III) is subdivided into three sections:
Category III A – A precision instrument approach and landing with:
a) a decision height lower than 100 feet (30 m) above touchdown zone elevation, or no decision height (alert height); and
b) a runway visual range not less than 200 meters (660 ft).
Category III B – A precision instrument approach and landing with:
a) a decision height lower than 50 feet (15 m) above touchdown zone elevation, or no decision height (alert height); and
b) a runway visual range less than 200 meters (660 ft) but not less than 50 meters (160 ft) (ICAO and FAA) or 75 meters (246 ft) (JAA).[3]
Category III C – A precision instrument approach and landing with no decision height and no runway visual range limitations. This category is not yet in operation anywhere in the world, as it requires guidance to taxi in zero visibility as well. "Category III C" is not mentioned in EU-OPS.

Category III B is currently the best available system.[3]