How is the color of aluminum alloy AN fittings denoted?

The color of aluminum alloy AN fittings is denoted by blue. This designation helps to easily identify the fittings made from this specific material, which ensures compatibility and performance under various conditions in aviation applications. The use of color coding, such as blue for aluminum alloy AN fittings, is a standard practice in the aviation industry, providing a visual cue for maintenance personnel and engineers to select the right components quickly and accurately.

The other color options do not represent aluminum alloy AN fittings. Each color has a specific meaning in the context of aviation components, and understanding these designations is crucial for ensuring safety and functionality in aircraft systems.