Which fibers are considered organic when covering aircraft?

When it comes to aircraft covering materials, organic fibers are derived from natural sources. Cotton and linen fit this definition as they are obtained from plants. Cotton, for example, comes from the cotton plant's fluffy seed fibers, while linen is made from the fibers of the flax plant. Both are biodegradable and have been used for centuries in a variety of textiles, including applications in the aviation industry for covering fabric aircraft.

The other options include synthetic fibers. Nylon and Dacron, for instance, are both man-made materials. Nylon is a synthetic polyamide, and Dacron is a brand name for polyester, which is also synthetic. Similarly, fiberglass is a composite material made from glass fibers, and orlon is a type of acrylic fiber. Polyester and acrylic, too, are synthetic materials derived from petrochemical processes. This distinction between organic and synthetic fibers is important in the context of aircraft covering, as organic materials can have different properties regarding weight, strength, and environmental impact compared to synthetic alternatives.