What happens to the load experienced by an aircraft when the bank angle increases?

When an aircraft banks, the load factor changes due to the effects of lift and gravity in a turning maneuver. As the bank angle increases, the component of lift that opposes gravity decreases, while the component that acts towards the turn increases, resulting in greater total load being experienced by the aircraft. This effect is primarily due to the introduction of centrifugal force during the turn, which causes an increase in the total load experienced by the aircraft.

In level flight, the aircraft's lift must equal its weight, but during a banked turn, the vertical component of lift must still equal the weight, while the horizontal component generates the necessary centripetal force to maintain the turn. As a result, increasing the bank angle raises the total load factor, leading to an increased load on the aircraft. This is why the correct choice is that the load can increase due to centrifugal force.

Other options reflect misunderstandings of how load factors work in a turn. The load cannot decrease significantly or remain constant during banked turns, nor can it become negligible since the aircraft is actively maneuvering, which inherently increases demands on structural integrity and aerodynamic forces.