If you have RVR reported as 6-5-6, can you depart?

The reported RVR (Runway Visual Range) of 6-5-6 indicates that the visibility at the runway is varying, with one measurement being below the minimum acceptable level for departure. In aviation, specific RVR values are established as minimums required for safe takeoff, and in most cases, these thresholds must be met or exceeded to ensure that pilots can safely operate the aircraft during takeoff.

In this scenario, the value of 5 indicates visibility that is insufficient for typical departure operations, which generally requires an RVR of at least 6 or more in most regulations. If any of the RVR values falls below the accepted minimum, it generally results in a decision to not depart until conditions improve or special permission is granted under specific circumstances.

When considering the safety protocols and regulations in aviation, departing with inadequate visibility poses significant risks, including a reduced ability to see the runway during takeoff and less than ideal conditions for aborting takeoff should it become necessary. Therefore, the reported RVR does not meet the necessary criteria, and that is why the answer points to the inability to safely initiate a departure under these conditions.