Which of the following is NOT a primary concern for fabric seams?

In the context of fabric seams for aircraft covering, the primary concerns typically revolve around the ability of the seams to withstand mechanical stresses and environmental factors. Durability is crucial because seams need to endure the forces and movements experienced during flight, which includes tension, compression, and potential abrasion. Appearance is also important, as seams should provide a neat and professional look to the fabric covering, ensuring that it meets both aesthetic and regulatory standards.

Color, while it can influence the overall look of the aircraft, is not a primary concern when it comes to the performance and structural integrity of fabric seams. The choice of color may affect visual aspects and can play a role in temperature regulation or aesthetic preferences, but it does not influence the fundamental reliability or strength of the seam itself.

Elasticity, on the other hand, is essential for accommodating the dynamic movements and expansions of the fabric under various conditions, ensuring that the seams maintain integrity over time. Therefore, while color may enhance the overall design, it does not constitute a critical concern regarding the safety and performance of the fabric seams.