Which of the following is NOT a consideration when selecting fasteners for aircraft structures?

When selecting fasteners for aircraft structures, considerations must focus on their functionality, durability, and the operational environment in which the aircraft will be used. Environmental conditions play a significant role since fasteners must withstand factors such as temperature fluctuations, humidity, and exposure to various chemicals. Maintenance ease is also critical, as fasteners should allow for straightforward inspection and replacement without excessive labor or disassembly of critical components. Load requirements are essential as well, since fasteners must be able to handle the structural loads imposed on them during flight and under various operating conditions.

Aircraft aesthetics, while important in terms of overall design and presentation, do not directly influence the technical performance or safety of fasteners used in structures. Therefore, it is not a primary consideration when selecting fasteners, making it the correct choice in this context.