How can incorrect Load Planning lead to accidents?

Incorrect Load Planning can lead to accidents primarily by causing shifts in heavy cargo, which compromises the stability of the aircraft. When cargo is not loaded according to the weight and balance specifications, it can shift during flight due to turbulence or movement, leading to an imbalance. This imbalance can affect the aircraft's performance, especially during takeoff, landing, and in maneuvering situations.

Proper load planning is essential to maintain the center of gravity within the aircraft's operational limits. Any significant deviations due to improperly secured or incorrectly positioned cargo can increase the risk of loss of control. Additionally, if cargo is stacked inappropriately or excessively loaded in one section, it can lead to adverse aerodynamic effects, resulting in difficult handling and potential structural problems.

The other options discuss various aspects of load planning that may have benefits, like improving efficiency or addressing weight overload issues, but they do not directly relate to the catastrophic consequences of improperly managed cargo stability, making them less relevant to the question of how errors in load planning can lead to accidents.