Concur,
However, I feel that far too many operators are cavalier about this.
The OCH is different for PA and NPA, even for an NPA with a FAF or without...the additives that determine the MDA for the NPA or the DA for a PA could be radically different.
Another significant issue is noted on the explanation, that for precision approach, obstacles are considered for the approach AND missed approach,
while for the non-precision approach, obstacles are only evaluated on the final approach, missed approach is not considered in the obstacle evaluation.
Another issue is the additives to the OCH. NPA has set MOC per CAT for the MDA, while the precision approach lower limit, or DA, is variable depending on many factors.
Using the MDA as a DA, is fraught with issues...if nothing else, the way that the obstacles are used in the MDA or DA determinations...
OPS 1.430
Aerodrome operating minima — General
a(1) An operator shall establish, for each aerodrome planned to be used, aerodrome operating minima that are not lower than the values given in Appendix 1(Old) or Appendix 1 (New) as applicable. The method of determination of such minima must be acceptable to the Authority. Such minima shall not be lower than any that may be established for such aerodromes by the State in which the aerodrome is located, except when specifically approved by that State.
So has everyone submitted a custom minima for approval, or use what is on the chart?