What is required for a controlling RVR of 1200 RVR?

To achieve a controlling Runway Visual Range (RVR) of 1200 feet, the requirements must ensure adequate visibility for safe aircraft operations. The controlling RVR primarily pertains to the RVR readings that are factors in determining whether a runway can be safely used for landing or takeoff in specific weather conditions.

The correct requirement states that both the Touchdown Zone (TDZ) RVR and the Minimum Incremental Distance (MID) and rollout controlling must be taken into account if they are available. The TDZ RVR provides a measurement of visibility specifically at the touchdown point of the runway, which is critical for pilots during landing. In addition, knowing the RVR for the rollout portion is vital for pilots to understand the visibility conditions they will encounter once they have landed. The MID provides an additional safety layer in conditions of varying visibility.

Thus, having the TDZ RVR along with the MID and rollout controlling helps ensure that the visibility standards are in place, promoting safety for landing operations when the standard is set at 1200 RVR. This requirement ensures that all critical visibility factors are considered before deciding if a runway is suitable for flight operations.