What indicates that the desired torque has been achieved?

The indication that the desired torque has been achieved is when the handle breaks and clicks. This mechanism is designed into torque wrenches, particularly click-type wrenches, to give a clear, audible signal when the preset torque level has been reached. The clicking sound alerts the user to stop applying force, thus preventing overtightening, which can lead to damage of fasteners or components.

Achieving the correct torque is crucial in aviation maintenance, ensuring that fasteners are secure without being over-torqued, which can compromise the integrity of the assembly. Such tools are calibrated to help maintain compliance with specific torque requirements outlined in maintenance manuals and procedures. Therefore, the "break" or "click" of the handle serves as both a physical and audible confirmation that the operator has met the intended torque specification, ensuring safety and reliability in aircraft operations.