cat iiib – as iiia but with the addition of automatic roll out after touchdown incorporated with the pilot taking control some distance along the runway. this category permits pilots to land with a decision height less than 50 feet or no decision height and a forward visibility of in europe (76 metres, compare this to aircraft size, some of which are now over long) or in the united states. for a landing-without-decision aid, a fail-operational autopilot is needed. for this category some form of runway guidance system is needed: at least fail-passive but it needs to be fail-operational for landing without decision height or for rvr below .