What are the Requirements for the implimentation of Low Visibility Procedures at an airport?
It is the RVR values that are used to determine the applicable minima.
The switch from normal to LVP Ops varies from airport to airport but the changeover process typically commences when the dropping vis approaches 1000mtr (say roughly 1200m) and is dropping so that the ILS Cat2/Cat3 LVP can be offered as the vis/rvr falls to below Cat1 requirements. More detailed info can be found in the country AIP and the same info would be spelt out in the Jepp or equivalent.
The Low Visibility info is specified in Sec 1.3 in the 10-1P series pages of the Jeppessen Terminal charts, ie &quot;Airport Briefing&quot; pages.