Most airports now operate an instrument approach procedure that allows pilots to land an aircraft in reduced visibility. IRVR is used as one of the main criteria for low visibility measurement on instrument approaches, as in most cases a pilot must obtain visual reference of the runway to land an aircraft. This is determined using visibility sensors (either forward scatter instrument or transmissometer). The prevailing IRVR is then calculated via algorithms which also consider ambient light conditions (in daylight) and an assumed value for runway lighting intensity. In this webinar we will discuss IRVR and the importance of Runway Lighting to its calculation.

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