Final answer:
Jacks must be thoroughly inspected at least every six months, when sent out for repair and upon return, and before and after use when dealing with abnormal loads. The correct answer is 'D. All of the above.' These inspections are critical for ensuring safety and proper function.
Step-by-step explanation:
The inspection of jacks is an essential aspect of workplace safety and maintenance. In industrial and construction settings, jacks are often used to lift heavy loads and therefore must be kept in optimal working condition to prevent accidents and breakdowns.
According to safety regulations, there are specific times when jacks must be inspected to ensure they are safe to use.
Jacks must be inspected in various situations:
- At a minimum, they should be given a detailed examination at least once every six months.
- They must also be inspected whenever they are sent out for repair and when they are returned to ensure repairs were performed properly.
- Moreover, it's crucial to inspect jacks before and after use, especially when they have been subjected to abnormal loads, which could potentially have caused damage or stress.
Each of these inspection scenarios is important to sustain the safety and functionality of the jacks. Therefore, the correct option in the final answer regarding when jacks must be inspected is 'D. All of the above'.