When should a missed approach be initiated if all ILS components are operational but the required visual references are not established?

The correct response highlights that a missed approach should be initiated upon reaching the Decision Height (DH) while on the glide slope. The DH represents the altitude at which a pilot must decide whether to continue the approach or execute a missed approach if the required visual references have not been established.

This procedure is critical because it ensures the aircraft maintains safety and adheres to established protocols. If visual references are not visible at the DH, continuing the approach could lead to unsafe situations, such as descending below minimums in a low-visibility scenario. The Decision Height serves as a definitive point, guiding pilots to make a clear and informed decision about whether to proceed or to initiate a missed approach, thus maintaining safety and operational integrity.

While air traffic control guidance and predetermined distances can play roles in the overall approach strategy, they do not take precedence over the crucial moment of reaching the Decision Height, where the visual determination must be made. Therefore, recognizing the DH's significance in the context of an ILS approach is vital for effective and safe flight operations.