What type of fabric is most widely used for covering aircraft structures?

• A. Heat-shrinkable polyester fabric
• B. Dacron fabric
• C. Nylon fabric
• D. Cotton fabric

Answer: (B)

When covering aircraft structures, a fabric that remains dimensionally stable, resists moisture, and accepts a durable finish is essential. Dacron fabric, a polyester material, fits this need best. It holds its shape under changing temperatures and humidity, doesn’t shrink or stretch excessively after installation, and takes coatings like dope or varnish well, creating a durable, tight skin over the structure.

Cotton fabric is older and more susceptible to moisture damage and aging, so it isn’t favored for modern coverings. Nylon fabric has good strength but doesn’t offer the same long-term dimensional stability and finish compatibility as polyester for widespread aircraft coverings. Heat-shrinkable polyester describes a treatment or property used to tighten the fabric after it's applied, but the base fabric most widely used for coverings remains polyester (Dacron).