Under Part 121 / 135. The pilots can only commence an approach (proceed past the final approach fix) if the latest weather received is above landing minimums. Mainly, pilots are concerned with visibility.
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Decision AltitudeIn practical terms, that means approaches with a glide slope (ILS), and approaches with a glide path (LPV, LNAV/VNAV). DA's are different than MDAs. MDAs are absolute floors, but when flying to a DA, you make your continue-to-land or go missed decision at DA, while you remain on the glideslope.