that was great answer !thank you so much FatFlyer
i was wondering why pilot of airbuses always use MDA filed PREF page on ILS CAT2/3 instead DA!
and
for info of who are worry about my aviation situation!i m probationary first officer at IRAN and i knew enough about DA DH MDA and more...but its my habit to asking, always ,include which i known already because there is always something exist if u want for every thing