What does RVR stand for and how is it measured?

The term RVR stands for Runway Visual Range, which is a critical measurement in aviation indicating the distance over which a pilot of an aircraft on the runway can see the runway environment. It is primarily measured using transmissometers, which are instruments designed to assess the amount of light that can pass through the air over a specified distance. These measurements help determine visibility conditions during various weather scenarios, such as fog or heavy rain.

Accurate RVR readings are essential for ensuring that pilots receive reliable information regarding the visibility level on approach and landing, which directly impacts safety and operational decisions. The measurement helps pilots make informed decisions regarding their ability to land and take off safely based on current visibility conditions at the runway.