Originally Posted by
albatross
Dumb Colonial but:
” Is not DA used for non-precision approaches and DH for precision ( ILS) approaches. You may not descend below a DA until you have “The Runway Environment” in sight but you decide at the DH whether to land or overshoot and you will descend slightly below the DH due to your downward momentum and inertia while initiating a missed approach.
In both cases referenced to QNH.”
DA (QNH) or DH (QFE) for precision approach, MDA (QNH) or MDH (QFE) for non-precision approach.