What is a disadvantage of using only metallic fasteners in aircraft?

Choosing only metallic fasteners in aircraft can indeed lead to increased weight, which is a significant disadvantage in aerospace design. Aircraft are designed to be as light as possible to enhance fuel efficiency and overall performance. Metallic fasteners, while strong and reliable, typically weigh more than alternative fastening materials such as plastics or composites. This added weight can affect the overall weight of the aircraft and its payload capacity, leading to higher operational costs.

Moreover, advancements in materials sciences have developed lightweight alternatives that can provide equivalent or superior performance in terms of strength and durability, thus offering engineers more options to optimize weight without sacrificing safety or functionality. The increased weight from metallic fasteners becomes especially critical in designs focused on fuel efficiency and performance, highlighting the trade-offs engineers must navigate during aircraft design and construction.