airport present weather detector
Max.: 800 m (2624'08")
Min.: 50 m (164'00")
Runway Visual Range (RVR) is defined as the distance over which the pilot of an aircraft on the centreline of a runway can see the runway surface markings or the lights delineating the runway or identifying its centre line. Because it is not possible to measure RVR directly, instrumented RVR (IRVR) systems are used to provide an assessment of RVR to be used in determining airport operating conditions.