What is the maximum crosswind for landing when RVR is less than 4000 feet or 3/4 mile?

The maximum crosswind for landing when the runway visual range (RVR) is less than 4000 feet or 3/4 mile is indeed 15 knots. This limitation is in place for safety reasons, as lower visibility conditions can make it more challenging for pilots to assess their surroundings and control their aircraft during landing.

When the RVR drops below 4000 feet, the ability to maintain control during crosswind landings diminishes, increasing the risk of a mishap. The 15-knot limit specifically represents a balance between safety and operational capability, allowing pilots to land effectively without compromising their control over the aircraft.

The choice of 15 knots reflects industry standards and best practices for landing in reduced visibility conditions. This limit ensures that pilots can still achieve a safe landing while adhering to the constraints imposed by lower visibility.