What action should be taken if the oil pressure drops below the minimum during flight?

When oil pressure drops below the minimum during flight, the most appropriate action is to land as soon as practical. Maintaining adequate oil pressure is crucial for engine lubrication and cooling; a drop in oil pressure indicates that the engine may not be receiving sufficient lubrication, which can lead to serious engine damage or failure if not addressed promptly.

By opting to land as soon as practical, the pilot can ensure safety, allowing for a controlled descent to a suitable landing area, thereby minimizing the risk of an engine failure that could lead to a more hazardous situation. The other choices do not prioritize safety effectively; increasing throttle could exacerbate the problem by increasing the engine load, continuing to fly normally ignores a critical warning from the aircraft's systems, and contacting ground control might delay necessary actions without guaranteeing immediate assistance. Thus, landing as soon as practical is the most responsible and safe course of action in this scenario.