What must be ensured when using a torque wrench to avoid over-torquing?

When using a torque wrench, it is essential to ensure proper presetting of the tool before applying it to a fastener. Presetting involves adjusting the torque wrench to the specific torque value required for the application, which helps prevent over-torquing. If the tool is not preset correctly, there is a significant risk of applying too much torque, which could lead to fastener failure or damage to the components being joined.

Proper presetting not only helps in achieving the desired clamping force but also ensures that the dynamic nature of the wrench's measurements is maintained. Torque wrenches, especially click-type or electronic ones, will give an indication or signal when the desired torque is reached, but this is only effective if the tool is set to the correct value beforehand.

While checking for wear, using an additional tool, or measuring match length are important considerations in maintenance and assembly procedures, they do not directly ensure that the torque wrench will apply the correct torque setting. Therefore, the focus on presetting the tool is crucial for accurate and safe assembly in aerospace applications.