What is the smallest size cable that may be used in aircraft primary control systems?

The smallest size cable that may be used in aircraft primary control systems is 1/8 inch. This size is specified based on the requirements for strength and reliability in critical control applications within an aircraft. Primary control systems are essential for the safe operation of the aircraft, as they directly influence the pilot’s ability to maneuver the aircraft.

Using a cable with a diameter of 1/8 inch ensures that it can handle the necessary loads and forces while maintaining the durability needed for the demanding conditions of flight. The smaller cable size is favored because it strikes a balance between strength and weight, allowing for efficient operation without adding unnecessary weight to the aircraft.

Other options, such as 1/4 inch, 3/16 inch, and 1/2 inch, either exceed the necessary size for primary control systems or do not meet the minimum requirements established by aviation standards. In practice, using a cable that is too large can increase weight unnecessarily, while one that is too small may not provide sufficient strength or resilience, thus potentially compromising safety.