In what scenario should a mechanic avoid working alone?

A mechanic should avoid working alone when handling heavy loads due to the increased risk of injury and the potential for accidents. Working with heavy materials often requires additional support to lift, move, or stabilize the load, and having a second person present can provide assistance in case of sudden difficulties, such as loss of control or physical strain. Additionally, if an accident occurs, having a partner can ensure that immediate help is available, which can be crucial in emergencies.

In contrast, scenarios like routine inspections, testing alarms, and performing minor repairs typically involve lower risks and may not necessitate having an extra set of hands present. These tasks can usually be completed safely by an individual as long as appropriate precautions are taken. However, in situations where a mechanic's safety may be significantly jeopardized, such as with heavy loads, it is essential to have a co-worker there to help prevent accidents and ensure a safer working environment.