What does DA stand for in IFR procedures?

Decision Altitude (DA) is a key term in Instrument Flight Rules (IFR) procedures that refers to a specified altitude in the precision approach at which a missed approach must be initiated if the required visual references to continue the final approach and landing are not in sight. DA is critical for pilots during instrument flying, as it provides a clear vertical limit for decision-making when approaching the runway.

During a precision approach, such as an ILS (Instrument Landing System) approach, the DA is typically published on approach charts and serves as a safety measure to ensure that pilots are prepared to execute a missed approach if they do not see the runway environment at the correct altitude. This allows for a structured and safe transition from guided navigation to the landing phase of the flight.

Understanding the concept of Decision Altitude is vital for IFR pilots, as it underscores the importance of maintaining situational awareness and making informed decisions during critical phases of flight.