This means aircraft landing from the southern side are doing so against the wind, which is the norm. Two units of a signalling instrument called runway visual range transmissometer have been installed on the primary runway. In CAT III-B, an aircraft can descend till 50 feet above the ground because of the advanced signalling system. CAT III-B is the second-most advanced instrument landing system available. Most airlines operating in India already have pilots who are CAT III-B compliant.

Source: The Telegraph November 29, 2017 21:33 UTC