Plain English Meaning

It is the point on the way down during an instrument approach where the pilot has to make a yes-or-no decision: if the runway environment is in sight and the aircraft is in a good position to land, continue; if not, go around and fly the missed approach.

Full Definition

DA/DH is the specified altitude or height on a precision or approach-with-vertical-guidance instrument approach at which the pilot must decide whether to continue the approach and land or execute a missed approach. Decision Altitude (DA) is referenced to mean sea level and read from the altimeter. Decision Height (DH) is referenced to the height above the touchdown zone or runway threshold. To continue below DA/DH, the required for the must be distinctly visible and identifiable, and the aircraft must be in a position to land using .