FAA Powerplant Written Practice Test

How is aircraft wire typically identified?

1. By color coding

2. By the choice of the manufacturer

3. By size and length

4. By a universal numbering system

The correct answer is: By the choice of the manufacturer

Aircraft wire is typically identified using various methods, and one of the most common practices is through a universal numbering system. This system assigns specific numbers that correspond to certain characteristics of the wire, including its size, insulation type, and temperature rating. This standardization ensures that anyone working with the wire can easily identify its specifications and suitability for particular applications in aircraft systems. Color coding is often used in conjunction with identification methods but primarily for functional grouping or ease of visibility rather than as the sole identifier. The choice of the manufacturer could result in variations, leading to inconsistencies that can complicate maintenance or repair tasks. Size and length are important considerations for specific applications of wire but do not serve as the primary identification method for the entire wire type. The universal numbering system, therefore, provides a comprehensive approach to standardize the identification of aircraft wire, allowing for clarity and uniformity across different manufacturers and applications in aviation.