Why is a ground check of flight controls necessary?

A ground check of flight controls is necessary primarily to ensure proper function before flight. This means that all moving parts of the aircraft's control system—such as the control yoke, rudder pedals, and ailerons—are functioning correctly and responding as expected. Performing this check helps detect any potential issues that could compromise safety during the flight. For instance, it allows the pilot to confirm that the controls move smoothly and freely without any obstruction or defects that could lead to malfunctions in the air.

This type of ground check is a critical aspect of a pre-flight inspection and complements other safety measures that pilots take to prepare for a flight. It ensures that the aircraft is ready for operation, which ultimately protects both the pilot and passengers by addressing any control discrepancies before take-off.