What is the structure of coaxial aircraft wire?

The structure of coaxial aircraft wire is designed to provide effective shielding and maintain signal integrity, especially in environments exposed to electromagnetic interference (EMI). The correct answer describes coaxial wire as having a center wire surrounded by a metallic braided shield. This configuration allows the center conductor to carry the electrical signal while the braided shield serves two key purposes: it protects the signal from external electromagnetic interference and helps prevent signal leakage, which can degrade performance.

The inner core is typically made of copper or another conductive material, ensuring low resistance for signal transmission. The metallic braided shield, often made of copper or aluminum, provides a conductive surface that can effectively dissipate external noise and improve the cable's overall reliability. Insulation separates the center conductor from the braided shield, ensuring there’s no short circuit while allowing for the maximum transfer of signals.

This structure is particularly important in aviation, where maintaining clear and reliable communication signals is critical, especially in navigational and control systems. Other wire types mentioned in the options do not provide the same level of shielding or signal clarity, making coaxial wire the preferred choice in many applications.