Under what conditions must a missed approach be executed at DA/MDA?

Executing a missed approach at Decision Altitude (DA) or Minimum Decision Altitude (MDA) is crucial for maintaining safety during an approach. The correct scenario for executing a missed approach is when the runway is not visible and the pilot is directed to execute a missed approach. This ensures that the pilot adheres to safe operating procedures when unable to land safely.

At DA/MDA, if visual reference to the runway is not established, continuing the approach could result in an unsafe landing situation. Additionally, if air traffic control (ATC) instructs the pilot to go missed, it reinforces that conditions do not permit a safe landing, which necessitates following the missed approach procedure. This response not only acknowledges the absence of visual cues but also aligns with ATC guidance, which is vital for safe aircraft operation in complex environments.