What fuel is required when an alternate airfield is not necessary?

The requirement for fuel when an alternate airfield is not necessary typically involves ensuring that the aircraft can safely reach its intended destination while accounting for potential variations in fuel usage. The correct option specifies fuel to reach the destination plus a reserve of 10% of the planned fuel requirements.

This reserve fuel serves as a safety measure to accommodate unforeseen circumstances that may arise during the flight, such as changes in weather conditions, deviations from the planned flight path, or increased fuel consumption due to atmospheric conditions. Having this reserve is essential for maintaining a safety buffer, ensuring that the aircraft can manage unexpected situations without compromising safety.

In the context of flight regulations and best practices, the requirement for a reserve reflects a cautious approach to fuel management, emphasizing the importance of planning for contingencies even when an alternate airfield is not deemed necessary. This practice aligns with standard aviation protocols which prioritize safety above all.