What does the term "ballast" refer to in aviation?

In aviation, the term "ballast" refers to additional weight placed in an aircraft to ensure stability and balance during flight. This weight helps to counteract the effects of variables, such as fuel burn or passenger movement, which can change the center of gravity. Properly managing ballast is crucial for maintaining an aircraft's performance characteristics and ensuring safe handling.

When an aircraft is out of balance, it can lead to difficulties in control, increased drag, and potential safety hazards. Therefore, implementing ballast effectively aids pilots in achieving required operational limits and optimal performance. This understanding of ballast is essential for flight safety and proper aircraft operations. The other options do not accurately reflect the specific role that ballast plays in aviation.