Why are some airports disqualified for use as an alternate (as listed in a approach procedure for that airport (A N/A)), when there is a provision in part 91 that an airport without an instrument procedure can be used if descent from MDA and under basic VFR conditions are expected using the 1-2-3 rule?
Example: I19 (Greene Co. Airport near Dayton, OH) has a disqualification (A N/A) listed in the procedure. Yet 11 miles away, I73 (Moraine) has no procedures and as I know it there is no specific disqualification. Albeit, you could only use Moraine for an alternate if descent from MDA and under basic VFR is forecast for the area.
So, why can you not use Green Co. if descent from MDA under basic VFR would be possible?