Which system is primarily affected by poor rigging practices?

The flight control system is primarily affected by poor rigging practices because rigging involves the alignment and adjustment of control surfaces such as ailerons, elevators, and rudders. Proper rigging ensures that these components respond accurately and predictably to pilot inputs, thereby maintaining effective control of the aircraft during flight. If rigging is performed improperly, it can lead to control surface misalignment, which can result in adverse handling characteristics, difficulty in control, and potential safety hazards during flight.

In contrast, the electrical system, fuel system, and navigation system can encounter problems due to their specific operational needs, but they are not as directly impacted by rigging practices as the flight control system. Issues in the electrical system may stem from wiring problems, fuel system issues might arise from contamination or leaks, and navigation system inaccuracies usually relate to instrumentation and data input rather than rigging integrity. Thus, the most critical impact of poor rigging is on the flight control system, making it vital for safe aircraft operation.