sevenstrokeroll:
a little thread drift...at the dawn of the jet age, even though ILS mins were 1/2 mile vis, IF YOU DIDN"T HAVE A FLIGHT DIRECTOR you could only do 3/4 miles.
it wasn't even an airline thing, it was a jet thing under FAA jurisdiction. the DH was 250' without a FD.
As I said two messages ago it was LOC MDA that became DH and perhaps not less than 3/4 or RVR 4000. Perhaps some of that was company and some FAA.