What is the proper method to verify control surface free play and absence of obstructions?

What is the proper method to verify control surface free play and absence of obstructions?

• A. Visually inspect and manually move surfaces; ensure no binding, interference, or foreign objects.
• B. Only rely on electronic sensors.
• C. Check if surfaces move only when engine is running.
• D. Observe flight control surfaces from a distance.

Answer: (A)

Testing control surface free play and absence of obstructions is a hands-on check. Visually inspect the hinges, gaps, and surrounding areas for wear, damage, or debris, then grab the surface and move it through its full range to feel for smooth, unobstructed motion. This directly confirms there’s no binding, interference, or foreign objects in the path of the surface, and it verifies that there is the expected small amount of mechanical play without slow or sticky movement. Relying on electronics alone can miss physical issues, and checking only while the engine is running or from a distance won’t reveal tight spots or obstructions in the hinge line. Do the check with the aircraft secured and power off so you can safely verify the surface moves freely.

Testing control surface free play and absence of obstructions is a hands-on check. Visually inspect the hinges, gaps, and surrounding areas for wear, damage, or debris, then grab the surface and move it through its full range to feel for smooth, unobstructed motion. This directly confirms there’s no binding, interference, or foreign objects in the path of the surface, and it verifies that there is the expected small amount of mechanical play without slow or sticky movement. Relying on electronics alone can miss physical issues, and checking only while the engine is running or from a distance won’t reveal tight spots or obstructions in the hinge line. Do the check with the aircraft secured and power off so you can safely verify the surface moves freely.