Describe the function of a torque wrench.

A torque wrench is specifically designed to tighten bolts to a predetermined torque level. This is crucial in applications where precise tension is required, such as in aviation structures. Proper torque ensures that the components are secured adequately without being over-tightened, which could lead to material fatigue, damage, or failure.

In the context of aviation mechanics, achieving the correct torque specification is essential for maintaining the integrity and safety of aircraft components. Each bolt and fastener has a specified torque value provided by manufacturers, and the torque wrench allows mechanics to achieve that level accurately.

The other choices do not relate to the function of a torque wrench. Measuring pressure relates to tools like pressure gauges, drilling holes is the function of a drill, and calculating load resistance involves engineering principles outside the specific use of a torque wrench. Thus, the accurate function of a torque wrench centers on its ability to apply a specific amount of force in a controlled manner to fasteners.