Which of the following is a function of fabric covering in aircraft?

The function of fabric covering in aircraft is primarily to maintain structural integrity. This covering acts as a crucial component that enhances the strength and stability of the aircraft's airframe, particularly for those constructed with light materials like wood or metal frames. The fabric provides a tight, aerodynamic surface that supports the aircraft's shape and helps withstand various stresses experienced during flight, including aerodynamic loads and pressure changes.

While increasing fuel efficiency, enhancing aesthetics, and providing protection against corrosion are also important considerations in aircraft design, they are secondary effects of the fabric covering. The primary role remains ensuring that the aircraft maintains its intended structural form and performance capabilities under operational conditions. A well-maintained fabric covering can contribute to overall aerodynamic efficiency and protect underlying materials, but its fundamental purpose is to secure structural integrity, allowing the aircraft to function effectively and safely.