Originally Posted by
Texandrvr
These criteria are going to be different for each company's ops specs. In an interview I would say, "I don't know what your company's ops specs say, so I'll tell you what the AF(or insert your company here) reg says.
True. However every airline that I know of use visibility as the controlling factor and the following: If the vis is below min when you arrive at the FAF, you cannot attempt the approach. If it drops below min after arriving at the FAF, you can continue the approach to minimums.