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". This size is significant because it provides the necessary strength and flexibility required for controlling various flight surfaces. In the context of primary control systems, the cable must withstand the stresses and loads that can occur during flight operations, including dynamic forces that arise from wind and maneuvering.

Larger cable sizes, although stronger, can introduce additional weight and may not be practical for control systems, where minimizing weight while maintaining structural integrity is crucial. The 1/8" cable strikes a balance between strength and weight, making it suitable for most small to medium-sized aircraft control applications.

Understanding the specifications for control cables is essential for maintaining airworthiness and ensuring that the aircraft responds correctly to pilot inputs. Therefore, adhering to this size requirement is vital for both safety and compliance with aviation regulations.