In a primary control system, which type of cable is commonly used?

In a primary control system, flexible control cable is commonly used because it is specifically designed for applications requiring movement and flexibility. This type of cable can easily bend and route through tight spaces while maintaining its strength and performance.

Flexible control cables are engineered to facilitate precise control over various systems, such as throttle, elevator, and other flight control mechanisms in aviation. Their construction allows for minimal resistance and smooth operation, which are crucial characteristics in a control system where responsiveness and reliability are paramount.

The other types of cables listed, while useful in various applications, do not offer the same level of flexibility and adaptability necessary for primary control systems. Safety cables are typically used for securing loads rather than controlling them, tension cables are more for structural support, and standard aircraft cable, although strong, lacks the flexibility needed for dynamic control operations. This makes flexible control cables the preferred choice for ensuring effective control and movement in primary systems.