in our ops manual it says this
If the reported RVR decreases below the specified minima while operating below 1,000 AAL, the approach may be continued to the DH/DA and, providing the required visual reference is established and maintained, the approach may continue to a landing.
On a CATIIIB approach with no DH, the landing may be completed, as visual reference is not required until after nose wheel touchdown
the background being just as I stated in the previous post. There is no decision to be made. the there no requirement for visual reference, and RVR is not controlling after 1'000 AAL.
In the absence of any specific prohibition on continuing the approach and landing, I would continue and land. think about it. why are we allowed to go to 100 for cat2 and 50 for cat3a but we must immediately carry out an missed approach for a cat 3b with no DH. it makes no sense