What is the purpose of rigging and clearance checks for flight control systems?

• A. To ensure proper movement, alignment, and control surface authority with no interference or binding.
• B. To inspect electrical circuits for corrosion.
• C. To calibrate pitot-static instruments.
• D. To verify fuel pump redundancy.

Answer: (A)

Rigging and clearance checks focus on making sure the flight control system moves exactly as it should and that nothing gets in the way of that movement. Rigging involves adjusting the control linkages, cables, push-pull tubes, and related hinges so the control surfaces—ailerons, elevators, rudder—achieve the correct geometry and neutral position. Clearance checks verify there’s enough free movement and no interference between moving parts or with nearby structure, so surfaces don’t rub, bind, or contact other components at any point in their travel.

This is essential for proper movement, alignment, and control surface authority. If the linkage lengths or pulley positions are off, surfaces may not move in unison or to their full deflection, making the aircraft unresponsive or imbalanced. If there’s insufficient clearance, a surface could bind or strike another part in flight, leading to loss of control or damage. By confirming both rigging and clearance, you ensure the controls respond predictably to pilot input and maintain safe margins throughout the full range of motion.

The other activities described aren’t about this specific system check. Inspecting electrical circuits for corrosion relates to the electrical system, calibrating pitot-static instruments deals with air data and instrumentation, and verifying fuel pump redundancy concerns the fuel system. None of these ensure that flight control surfaces move correctly and without interference.