The acronym DA stands for which term?

• A. Data Analysis
• B. Declared Airspeed
• C. Decision Altitude
• D. Direct Current

Answer: (C)

Decision Altitude is the altitude at which, on a precision instrument approach with vertical guidance, you must decide whether you can continue to land or must execute a missed approach if the required visual references are not visible. It marks the point where safe landing cannot be assured if the runway environment isn’t in sight, so the pilot must either continue visually and land or go around. This timing is crucial for safety on approaches like ILS, where you descend along a glide path and must have the runway in sight by that altitude. Other terms listed don’t describe a flight-decision point on an instrument approach: data analysis is a general data term, declared airspeed is a different aviation concept related to stated speeds, and direct current is an electrical term.