What is the purpose of the decision altitude in a precision approach?

In the context of a precision approach, the decision altitude serves as a crucial reference point for pilots, marking the altitude at which a decision must be made regarding whether to continue the approach to landing or to initiate a go-around maneuver. This decision is typically based on whether the pilot has visual contact with the runway or the required visual references. If the necessary visual references are not established at or above this altitude, the pilot should execute a go-around to ensure safety.

This decision-making point is critical because it ensures that pilots have a clear and standardized altitude to rely on for making this important decision, thereby enhancing safety and operational efficiency during the approach phase.