If RVR is reported as 6-M-6, what is the decision regarding departure?

When Runway Visual Range (RVR) is reported as 6-M-6, it indicates that the visibility is significantly below the minimum requirements for a safe takeoff. In many regions, particularly under Part 91 and Part 121 regulations, an RVR value of less than 550 meters typically mandates that a departure cannot be made due to heightened safety concerns related to visibility.

This specific RVR reading suggests that the runway visibility does not meet the required standards, leading to the decision that a departure is not permissible. Safe departure conditions are critical for ensuring that pilots can adequately navigate and control the aircraft during takeoff, particularly during the critical phases of flight in low visibility situations.

Therefore, the decision associated with an RVR of 6-M-6 is that you cannot depart, which prioritizes safety for all aviation operations.