What interval is used for RVR when it measures between 400m and 800m?

When assessing Runway Visual Range (RVR) values between 400 meters and 800 meters, the established interval for measurement is 50 meters. This interval is based on standard aviation and meteorological guidelines that aim to provide a practical and useful range of measurements, facilitating more precise evaluations of visibility conditions for operational safety.

The 50-meter increment allows for a detailed understanding of changes in visibility, which is particularly important during conditions that may affect flight operations, such as fog, rain, or mist. By having a consistent measurement interval, pilots, air traffic control, and meteorologists can make informed decisions based on the current visibility levels, ensuring that safety protocols can be effectively followed.

In scenarios where RVR measures below 400 meters or above 800 meters, different intervals or measurement standards may apply, which helps cater to the specific visibility challenges associated with those conditions. This methodology emphasizes accuracy and safety within aviation operations, reflecting the importance of maintaining operational effectiveness even in adverse weather.