Which of the following ensures that components are held together securely in aviation assembly?

Fasteners and bolts play a critical role in aviation assembly by providing the mechanical strength needed to hold components securely together. These fasteners are specifically designed to withstand the stresses and forces that aircraft experience during operation, such as vibrations, fluctuations in temperature, and dynamic loads encountered during flight.

The use of bolts and fasteners allows for reliable connections between various parts of the aircraft structure, such as fuselage, wings, and tail sections. They can be made from materials that are resistant to fatigue and corrosion, ensuring the durability of the assembly over time. Furthermore, proper torque specifications and installation techniques enhance the effectiveness of these fasteners, ensuring that they maintain their integrity throughout the lifespan of the aircraft.

In contrast, while gravity can assist in holding components in place, it does not provide the necessary force to secure them against movement during flight. Liquid adhesives may be used in specific applications but are generally not the primary method for securing major structural elements. Air pressure does not contribute to the mechanical assembly of components; rather, it is a factor related to aircraft operation, such as in the case of pressurization in the cabin. Thus, fasteners and bolts remain essential for ensuring that aircraft components are reliably and securely assembled.