During a ground operational check of the elevator trim tab system, what occurs when the cockpit control is moved toward the nosedown position?

When the cockpit control is moved toward the nosedown position, the correct response is that the trailing edge of the trim tab moves upward regardless of the elevator position. This occurs because the elevators and trim tabs are designed to work together, with the trim tab providing a fine-tuning adjustment to the elevator's position to assist in maintaining the desired aircraft attitude.

In this case, moving the control toward the nosedown position indicates that the pilot wants to lower the nose of the aircraft. By moving the trim tab upward, it creates a force that helps to push the elevator downward more effectively, thereby assisting the pilot in reducing the pitch attitude. This function allows for better control and reduces pilot workload by making it easier to maintain a steady attitude without continuous control input.

Understanding this principle is crucial for pilots and technicians alike, as it ensures the trim systems are functioning correctly during ground operations, reflecting proper aircraft performance when in flight.