Originally Posted by
80ktsClamp
That is not correct except for CAT III. For CAT III, if the weather goes down inside the FAF, then you have to go missed. Your statement is incorrect for CAT I and II.
If you see it (any of the list of things that allow you to go 50 feet below DA/DH and then subsequently the runway) on a CAT I or II approach, you have the required visibility to land.
I think you better read OpSpec C074 very carefully. It is pretty clear that it is for Cat I approaches. RVR, when available, is controlling for landings, among other things. Simply put, if you don't have the RVR, you can't land.
http://fsims.faa.gov/wdocs/notices/n8000_367.pdf
b. CAT I Precision Approach Procedures. The certificate holder/operator/program manager/foreign air carrier shall not use an IFR landing minimum for CAT I precision approach procedures lower than specified in Table 1.
(1) Touchdown zone (TDZ) Runway Visual Range (RVR) reports, when available for a particular runway, are controlling for all approaches to, and landings on, that runway.