What type of control cable is frequently used for flight controls?

Flexible steel cables are frequently used for flight controls due to their strength, durability, and ability to withstand high tensile loads, which are common in aviation applications. These cables provide reliable performance in controlling aircraft surfaces like ailerons, elevators, and rudders.

The use of flexible steel cables allows for easier routing and installation in confined spaces within the aircraft, as they can bend without breaking, which is essential for complex control systems. Additionally, steel cables are less prone to stretching compared to other materials, maintaining precise control over time. Their corrosion resistance, when treated or coated properly, further enhances their longevity and safety in a flight environment.

In contrast, options like plastic-coated cables might not offer the same tensile strength or flexibility required under the demanding conditions of flight control systems. Rubber cables are generally not suitable due to their different mechanical properties, which do not align with the needs for stability in flight control. Aluminum cables, while lightweight, don't provide the necessary strength for effective flight control systems compared to flexible steel cables.